When I execute a stored proc with input parms using SQL Server 2008, I get the following error msg: Msg 8152 String or binary data would be truncated. Do you know how I can resolve this?

I created a stored procedure as follows:

When I create it I get the following message: Command(s) completed successfully.

However, when I execute it with the following input parms as follows:

exec proc_CSL_Load_ImportMonthlyChecks '0115', '5500', 479.58, '10/21/2016', '01/18/2017', 'git3jz'

I get the error:

Msg 8152, Level 16, State 14, Procedure proc_CSL_Load_ImportMonthlyChecks, Line 5
String or binary data would be truncated.
The statement has been terminated.

Do you know how I can resolve this error?

USE [CSL]
GO
/****** Object:  StoredProcedure [dbo].[proc_CSL_Load_ImportMonthlyChecks]    Script Date: 01/18/2017 09:59:40 ******/
SET ANSI_NULLS OFF
GO
SET QUOTED_IDENTIFIER OFF
GO
ALTER PROC [dbo].[proc_CSL_Load_ImportMonthlyChecks]
@strBank varchar(4), @Amt1 varchar(11), @Amt2 numeric(9,2), @dtFileDate nvarchar(10),
@dtImportDate nvarchar(10), @strImportBy varchar(50)  
AS
INSERT INTO dbo.tbl_CSL_ImportMonthlyChecks (bankname, banknumber, amt1, amt2,
datefile, dateimported, importedby, branch)
SELECT bankDescr, bankAcctNum, @Amt1,  @Amt2,
@dtFileDate, @dtImportDate, @strImportBy, '2'
FROM dbo.tbl_CSL_Bank
WHERE bankID = @strBank

The table layouts are as follows:

tbl_CSL_Bank
bankID (PK,  varchar(4), not null)
bankDescr (varchar(50), not null)
status (varchar(50), not null)
entity (varchar(50), not null)
bankAcctNum (varchar(15), not null)

tbl_CSL_ImportMonthlyChecks
bankname (varchar(50),null)
banknumber(varchar(4), not null)
amt1(varchar(11), not null)
amt2(numeric(19,2) not null)
datefile(varchar(10), not null)
dateimported(varchar(10), not null)
importeby(varchar(50), not null)
branch(varchar(50), not null)