Loans (Analysis of Nonaccrual Loans with no ACL) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Nonaccrual [Line Items]
Amortized Cost of Nonaccrual Loans, No Allowance	$ 20,911	$ 19,275
Commercial Real Estate
Financing Receivable, Nonaccrual [Line Items]
Amortized Cost of Nonaccrual Loans, No Allowance	6,393	1,715
Commercial Business
Financing Receivable, Nonaccrual [Line Items]
Amortized Cost of Nonaccrual Loans, No Allowance	6,382	15,762
Agriculture
Financing Receivable, Nonaccrual [Line Items]
Amortized Cost of Nonaccrual Loans, No Allowance	$ 8,136	$ 1,798