Loans - Loans Purchased and/or Sold During the Year by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	$ 833	$ 2,271
Sales	622	17,799
Commercial and Industrial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	0	0
Sales	0	2,273
Commercial Real Estate Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	833	2,271
Sales	622	15,415
Agricultural Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	0	0
Sales	0	111
Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	0	0
Sales	0	0
Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	0	0
Sales	0	0
Home Equity Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	0	0
Sales	0	0
Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	0	0
Sales	0	0
Residential Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	0	0
Sales	$ 0	$ 0