Loans and Allowance for Credit Losses - Amortized Cost and Unpaid Principal of Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	$ 1,377,387	$ 1,413,886
Allowance for credit losses	(11,310)	(11,739)	$ (14,764)	$ (16,625)
Net loans	1,366,077	1,402,147
Unpaid Principal	1,386,768	1,425,429
Difference	(9,381)	(11,543)
Commercial & industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	404,789	448,338
Allowance for credit losses	(2,901)	(3,027)	(4,269)	(4,348)
Unpaid Principal	408,451	454,106
Difference	(3,662)	(5,768)
Commercial real estate | Owner occupied properties
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	304,595	300,200
Allowance for credit losses	(2,513)	(3,176)	(3,366)	(3,579)
Unpaid Principal	306,070	301,623
Difference	(1,475)	(1,423)
Commercial real estate | Non-owner occupied and multifamily properties
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	428,618	435,311
Allowance for credit losses	(3,063)	(2,930)	(3,704)	(4,944)
Unpaid Principal	431,855	438,631
Difference	(3,237)	(3,320)
Residential real estate | 1-4 family residential properties secured by first liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	31,241	32,542
Allowance for credit losses	(510)	(439)	(813)	(673)
Unpaid Principal	31,300	32,602
Difference	(59)	(60)
Residential real estate | 1-4 family residential properties secured by junior liens and revolving secured by 1-4 family first liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	19,523	19,610
Allowance for credit losses	(301)	(215)	(342)	(419)
Unpaid Principal	19,400	19,489
Difference	123	121
Residential real estate | 1-4 family residential construction loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	38,836	36,222
Allowance for credit losses	(210)	(120)	(260)	(454)
Unpaid Principal	39,146	36,542
Difference	(310)	(320)
Other construction, land development and raw land loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	91,328	88,094
Allowance for credit losses	(1,550)	(1,635)	(1,821)	(1,994)
Unpaid Principal	91,819	88,604
Difference	(491)	(510)
Obligations of states and political subdivisions in the US
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	20,938	16,403
Allowance for credit losses	(52)	(32)	(36)	(44)
Unpaid Principal	21,090	16,565
Difference	(152)	(162)
Agricultural production, including commercial fishing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	29,217	27,959
Allowance for credit losses	(128)	(91)	(46)	(49)
Unpaid Principal	29,358	28,082
Difference	(141)	(123)
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	4,618	4,801
Allowance for credit losses	(75)	(67)	(104)	(118)
Unpaid Principal	4,580	4,763
Difference	38	38
Other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	3,684	4,406
Allowance for credit losses	(7)	(7)	$ (3)	$ (3)
Unpaid Principal	3,699	4,422
Difference	$ (15)	$ (16)