Loans and Allowance for Credit Losses - Amortized Cost and Unpaid Principal of Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans	$ 1,548,924	$ 1,444,050
Allowance for credit losses	(14,764)	(21,136)	$ (21,017)		$ (19,088)
Net loans	1,534,160	1,422,914
Unpaid Principal	1,566,735	1,455,830
Difference	(17,811)	(11,780)
Cumulative Effect, Period of Adoption, Adjusted Balance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses				$ (16,600)
Commercial & industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans	695,797	772,468
Allowance for credit losses	(4,269)	(7,973)	(8,269)		(6,604)
Unpaid Principal	708,704
Difference	(12,907)
Commercial & industrial loans | Cumulative Effect, Period of Adoption, Adjusted Balance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans		612,254
Unpaid Principal		619,304
Difference		(7,050)
Commercial real estate | Owner occupied properties
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans	244,416
Allowance for credit losses	(3,366)
Unpaid Principal	245,508
Difference	(1,092)
Commercial real estate | Owner occupied properties | Cumulative Effect, Period of Adoption, Adjusted Balance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans		233,320
Unpaid Principal		234,363
Difference		(1,043)
Commercial real estate | Non-owner occupied and multifamily properties
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans	399,982
Allowance for credit losses	(3,704)
Unpaid Principal	402,477
Difference	(2,495)
Commercial real estate | Non-owner occupied and multifamily properties | Cumulative Effect, Period of Adoption, Adjusted Balance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans		392,452
Unpaid Principal		394,860
Difference		(2,408)
Residential | 1-4 family residential properties secured by first liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans	31,930
Allowance for credit losses	(813)
Unpaid Principal	32,009
Difference	(79)
Residential | 1-4 family residential properties secured by first liens | Cumulative Effect, Period of Adoption, Adjusted Balance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans		33,415
Unpaid Principal		33,510
Difference		(95)
Residential | 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]
Total portfolio loans	17,536
Allowance for credit losses	(342)
Unpaid Principal	17,414
Difference	122
Residential | 1-4 family residential properties secured by junior liens and revolving secured by 1-4 family first liens | Cumulative Effect, Period of Adoption, Adjusted Balance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans		18,236
Unpaid Principal		18,114
Difference		122
Residential | 1-4 family residential construction loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans	35,051
Allowance for credit losses	(260)
Unpaid Principal	35,280
Difference	(229)
Residential | 1-4 family residential construction loans | Cumulative Effect, Period of Adoption, Adjusted Balance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans		32,500
Unpaid Principal		32,760
Difference		(260)
Other construction, land development and raw land loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans	86,574
Allowance for credit losses	(1,821)
Unpaid Principal	87,558
Difference	(984)
Other construction, land development and raw land loans | Cumulative Effect, Period of Adoption, Adjusted Balance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans		83,463
Unpaid Principal		84,351
Difference		(888)
Obligations of states and political subdivisions in the US
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans	15,795
Allowance for credit losses	(36)
Unpaid Principal	15,912
Difference	(117)
Obligations of states and political subdivisions in the US | Cumulative Effect, Period of Adoption, Adjusted Balance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans		15,318
Unpaid Principal		15,274
Difference		44
Agricultural production, including commercial fishing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans	12,901
Allowance for credit losses	(46)
Unpaid Principal	12,957
Difference	(56)
Agricultural production, including commercial fishing | Cumulative Effect, Period of Adoption, Adjusted Balance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans		12,968
Unpaid Principal		13,093
Difference		(125)
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans	5,563
Allowance for credit losses	(104)
Unpaid Principal	5,522
Difference	41
Consumer | Cumulative Effect, Period of Adoption, Adjusted Balance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans		5,734
Unpaid Principal		5,794
Difference		(60)
Other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans	3,379	0
Allowance for credit losses	(3)	(2,107)	$ (1,467)		$ (2,079)
Unpaid Principal	3,394
Difference	$ (15)
Other loans | Cumulative Effect, Period of Adoption, Adjusted Balance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans		4,390
Unpaid Principal		4,407
Difference		$ (17)