Loans and Allowance for Credit Losses - Activity in ACL Related to Loans Held for Investment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	$ 11,739	$ 16,625
Credit Loss Expense (Benefit)	(167)	(1,905)
Charge-offs	(295)	(163)
Recoveries	33	207
Ending Balance	11,310	14,764
Commercial & industrial loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	3,027	4,348
Credit Loss Expense (Benefit)	156	(101)
Charge-offs	(295)	(163)
Recoveries	13	185
Ending Balance	2,901	4,269
Commercial real estate | Owner occupied properties
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	3,176	3,579
Credit Loss Expense (Benefit)	(663)	(215)
Charge-offs	0	0
Recoveries	0	2
Ending Balance	2,513	3,366
Commercial real estate | Non-owner occupied and multifamily properties
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	2,930	4,944
Credit Loss Expense (Benefit)	133	(1,240)
Charge-offs	0	0
Recoveries	0	0
Ending Balance	3,063	3,704
Residential real estate | 1-4 family residential properties secured by first liens
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	439	673
Credit Loss Expense (Benefit)	71	140
Charge-offs	0	0
Recoveries	0	0
Ending Balance	510	813
Residential real estate | 1-4 family residential properties secured by junior liens and revolving secured by 1-4 family first liens
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	215	419
Credit Loss Expense (Benefit)	74	(87)
Charge-offs	0	0
Recoveries	12	10
Ending Balance	301	342
Residential real estate | 1-4 family residential construction loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	120	454
Credit Loss Expense (Benefit)	90	(194)
Charge-offs	0	0
Recoveries	0	0
Ending Balance	210	260
Other construction, land development and raw land loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	1,635	1,994
Credit Loss Expense (Benefit)	(85)	(173)
Charge-offs	0	0
Recoveries	0	0
Ending Balance	1,550	1,821
Obligations of states and political subdivisions in the US
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	32	44
Credit Loss Expense (Benefit)	20	(8)
Charge-offs	0	0
Recoveries	0	0
Ending Balance	52	36
Agricultural production, including commercial fishing
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	91	49
Credit Loss Expense (Benefit)	29	(11)
Charge-offs	0	0
Recoveries	8	8
Ending Balance	128	46
Consumer loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	67	118
Credit Loss Expense (Benefit)	8	(16)
Charge-offs	0	0
Recoveries	0	2
Ending Balance	75	104
Other loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	7	3
Credit Loss Expense (Benefit)	0	0
Charge-offs	0	0
Recoveries	0	0
Ending Balance	$ 7	$ 3