Loans (Loans Subject to Payment Modifications) (Details) - CARES Act $ in Thousands	Dec. 31, 2020 USD ($) loan	Sep. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	37
Outstanding Balance | $	$ 48,560
% of Loan Category (Excludes PPP Loans)	1.70%	3.10%
Commercial and Industrial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	9
Outstanding Balance | $	$ 4,311
% of Loan Category (Excludes PPP Loans)	0.80%	1.20%
Commercial Real Estate Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	15
Outstanding Balance | $	$ 43,951
% of Loan Category (Excludes PPP Loans)	3.00%	5.70%
Agricultural Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0
Outstanding Balance | $	$ 0
% of Loan Category (Excludes PPP Loans)	0.00%	0.00%
Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	9
Outstanding Balance | $	$ 80
Residential Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	4
Outstanding Balance | $	$ 218
% of Loan Category (Excludes PPP Loans)	0.10%	0.50%