Passing ArrayList to another Scene

Question

I am trying to pass the ArrayList of customers back to the first Scene because I want to display the customers inside a table view. I add the customers to the Bank object inside the Second Scene Controller. I was able to get it to run the only issue is that I had to create a new instance of the Bank object. I am not sure where I would instantiate the Bank object that way it is not getting reset everytime I create an account and go back to the main screen

public class MainRun extends Application

@Override
public void start(Stage stage) throws Exception {
    Parent root = FXMLLoader.load(getClass().getResource("/sample/mainMenu.fxml"));
    Scene scene = new Scene(root);
    scene.getStylesheets().add("my_style.css");
    stage.setScene(scene);
    stage.show();
}

public static void main(String[] args) {
    launch(args);
}

This is my first scene class

public class FirstSceneController implements Initializable

private Scene scene;
private Stage stage;
private Parent root;

@FXML
private MenuItem exit_menuItem;
@FXML
MenuBar menu_Bar;

@FXML
private Button createAccount;
@FXML
private GridPane gridPane_root;
@FXML
private StackPane parentContainer;


public void closeWindow(ActionEvent actionEvent) {
    stage = (Stage) menu_Bar.getScene().getWindow();
    stage.close();
}

public void switchToCreateAccountWindow(ActionEvent event) throws IOException {
    root = FXMLLoader.load(getClass().getResource("addAccount.fxml"));

    scene = createAccount.getScene();

    root.translateYProperty().set(scene.getHeight());
    parentContainer.getChildren().add(root);

    Timeline timeline = new Timeline();
    KeyValue kv = new KeyValue(root.translateYProperty(), 0, Interpolator.EASE_IN);
    KeyFrame kf = new KeyFrame(Duration.seconds(1), kv);

    timeline.getKeyFrames().add(kf);
    timeline.setOnFinished(event1 -> {
        parentContainer.getChildren().remove(gridPane_root);
    });

    timeline.play();
}

@Override
public void initialize(URL url, ResourceBundle resourceBundle) {
    ImageView exitImage = new ImageView(new Image("exit_icon.jpg"));
    exitImage.setSmooth(true);
    exitImage.setPreserveRatio(true);
    exitImage.setFitHeight(16);
    exitImage.setFitWidth(16);
    exit_menuItem.setGraphic(exitImage);
}

Second Scene Class

public class SecondSceneController implements Initializable

ObservableList<String> list = FXCollections.observableArrayList("Checking", "Savings");

private Parent root;
private Scene scene;
private Stage stage;
private StackPane parentContainer;
@FXML
private GridPane gridPane_root;


@FXML
private MenuBar menu_Bar;
@FXML
ComboBox<String> account_types;
@FXML
private Button cancel_button;
@FXML
private TextField firstNameField;
@FXML
private TextField lastNameField;
@FXML
private TextField socialSecurityField;
@FXML
private TextField depositField;
@FXML
MenuItem exit_menuItem;

private double amount = 0.0;
Account account = null;
private Bank bank;


@Override
public void initialize(URL url, ResourceBundle resourceBundle) {
    account_types.setItems(list);
    ImageView exitImage = new ImageView(new Image("exit_icon.jpg"));
    exitImage.setSmooth(true);
    exitImage.setPreserveRatio(true);
    exitImage.setFitHeight(16);
    exitImage.setFitWidth(16);
    exit_menuItem.setGraphic(exitImage);
}

public void goBackToMainScreen() throws IOException {

    root = FXMLLoader.load(getClass().getResource("mainMenu.fxml"));
    scene = cancel_button.getScene();

    root.translateXProperty().set(scene.getWidth());

    parentContainer = (StackPane) scene.getRoot();
    parentContainer.getChildren().add(root);

    Timeline timeline = new Timeline();
    KeyValue kv = new KeyValue(root.translateXProperty(), 0, Interpolator.EASE_IN);
    KeyFrame kf = new KeyFrame(Duration.seconds(1), kv);

    timeline.getKeyFrames().add(kf);
    timeline.setOnFinished(event1 -> {
        parentContainer.getChildren().remove(gridPane_root);
    });

    timeline.play();
}

public void createAccountActionPerformed(ActionEvent event) throws IOException {
    boolean isValid;

    StringBuilder stringBuilder = new StringBuilder();

    String firstName = "", lastName = "", ssn = "";

    if (firstNameField.getText().isEmpty()) {
        System.out.println("First name must not be empty");
    } else {
        firstName = firstNameField.getText();
    }
    if (lastNameField.getText().isEmpty()) {
        System.out.println("Last name must not be empty");
    } else {
        lastName = lastNameField.getText();
    }
    if (socialSecurityField.getText().isEmpty()) {
        System.out.println("SSN must not be empty");
    }
    if (!socialSecurityField.getText().matches("\\d{3}-\\d{2}-\\d{4}")) {
        System.out.println("Invalid SSN");
    } else {
        ssn = socialSecurityField.getText().replace("-", "");
    }
    if (depositField.getText().isEmpty()) {
        System.out.println("Enter an amount!");
        isValid = false;
    } else {
        try {
            amount = round(Double.parseDouble(depositField.getText()), 2);
            isValid = true;
        } catch (NumberFormatException e) {
            System.out.println("Deposit must be a number!");
            isValid = false;
        }
    }
    if (account_types.getSelectionModel().isEmpty()) {
        System.out.println("Please select an account type!");
        isValid = false;
    } else if (account_types.getSelectionModel().equals("Checking")) {
        account = new Checking(amount);
        isValid = true;
    } else if (account_types.getSelectionModel().equals("Savings")) {
        account = new Savings(amount);
        isValid = true;
    }

    Customer customer = new Customer(firstName, lastName, ssn, account);
    bank.addCustomer(customer);


    if (isValid) {
        for (Customer c : bank.getCustomers()) {
            System.out.println(c.firstName + " " + c.lastName);
        }
        goBackToMainScreen();
    }

}

public void closeWindow(ActionEvent event) {
    stage = (Stage) menu_Bar.getScene().getWindow();
    stage.close();
}


private static double round(double number, int places) {
    if (places < 0) {
        throw new IllegalArgumentException();
    }
    BigDecimal bd = new BigDecimal(number);
    bd = bd.setScale(places, RoundingMode.FLOOR);
    return bd.doubleValue();
}

Bank Class that holds an arraylist of customers public class Bank

List<Customer> customers;

public Bank() {
    customers = new ArrayList<>();
}

public void addCustomer(Customer customer) {
    customers.add(customer);
}

public List<Customer> getCustomers() {
    return customers;
}