Trouble using setters

1

I’m starting out in AS3 and have hit a wall with using setters

I’ve set up my main movie clip. It has two mc’s on the stage both with externally defined classes. The first mc ‘Bank’ has this code;

package
{

import flash.display.MovieClip;

public class Bank extends MovieClip
{    
    private var _clientAccountValue = 0;
    
    public static function set deposit(money:int):void
    {
        if(money > 0)
        {
            _clientAccountValue += money;
            trace(_clientAccountValue);
        }
    }
}

}

The second mc ‘Client’ has the following;

package
{

import flash.display.MovieClip;

public class Client extends MovieClip
{    
    private var _checkValue = 10000;
    
    public function Client():void
    {
        Bank.deposit = _checkValue;
    }
}

}

The idea being the Client function sends the updated total to the Bank.deposit function. But I get this error: 1120: Access of undefined property _clientAccountValue.