Loans and Leases and Allowance for Credit Losses - Allowance for Credit Losses - Reserves, before ASU 2016-13 Adoption (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Specific, before ASU 2016-13 adoption		$ 1,061
General, before ASU 2016-13 adoption		14,556
Ending balance, before ASU 2016-13 adoption	$ 14,256	15,617	$ 16,421	$ 17,738
Commercial, Residential, and Farm Land Real Estate Portfolio Segment [Member] | Real Estate Sector [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Specific, before ASU 2016-13 adoption		419
General, before ASU 2016-13 adoption		11,858
Ending balance, before ASU 2016-13 adoption		12,277	12,075	11,766
Agricultural Portfolio Segment [Member] | Agricultural Sector [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Specific, before ASU 2016-13 adoption		244
General, before ASU 2016-13 adoption		281
Ending balance, before ASU 2016-13 adoption		525	524	482
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Specific, before ASU 2016-13 adoption		382
General, before ASU 2016-13 adoption		1,719
Ending balance, before ASU 2016-13 adoption		2,101	3,072	4,721
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Specific, before ASU 2016-13 adoption		16
General, before ASU 2016-13 adoption		569
Ending balance, before ASU 2016-13 adoption	$ 521	585	690	720
Unallocated [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
General, before ASU 2016-13 adoption		129
Ending balance, before ASU 2016-13 adoption		$ 129	$ 60	$ 49