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Loans (Analysis of Nonaccrual Loans with no ACL) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual, No Allowance $ 31,879 $ 19,275
Commercial Real Estate [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual, No Allowance 9,092 1,715
Commercial Business [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual, No Allowance 11,713 15,762
Agriculture [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual, No Allowance $ 11,074 $ 1,798