Loans and Allowance for Credit Losses - Portfolio of Risk-rated Loans by Grade and by Year of Origination (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
2021	$ 452,324
2020	298,472
2019	180,801
2018	106,863
2017	75,601
Prior	336,596
Total	1,450,657	$ 1,444,050
Government guarantees
Financing Receivable, Credit Quality Indicator [Line Items]
Total		349,226
Net of government guarantees
Financing Receivable, Credit Quality Indicator [Line Items]
Total		1,094,824
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	445,990
2020	295,201
2019	176,724
2018	99,104
2017	64,591
Prior	323,053
Total	1,404,663	1,397,595
Pass | Government guarantees
Financing Receivable, Credit Quality Indicator [Line Items]
2021	203,664
2020	22,169
2019	16,800
2018	5,212
2017	409
Prior	1,537
Total	249,791	334,639
Pass | Net of government guarantees
Financing Receivable, Credit Quality Indicator [Line Items]
2021	242,326
2020	273,032
2019	159,924
2018	93,892
2017	64,182
Prior	321,516
Total	1,154,872	1,062,956
Classified
Financing Receivable, Credit Quality Indicator [Line Items]
2021	6,334
2020	3,271
2019	4,077
2018	7,759
2017	11,010
Prior	13,543
Total	45,994	46,455
Classified | Government guarantees
Financing Receivable, Credit Quality Indicator [Line Items]
2021	1,501
2020	1,289
2019	0
2018	0
2017	9,570
Prior	1,123
Total	13,483	14,587
Classified | Net of government guarantees
Financing Receivable, Credit Quality Indicator [Line Items]
2021	4,833
2020	1,982
2019	4,077
2018	7,759
2017	1,440
Prior	12,420
Total	32,511	31,868
Commercial & industrial loans
Financing Receivable, Credit Quality Indicator [Line Items]
2021	258,608
2020	76,518
2019	44,787
2018	42,311
2017	24,082
Prior	57,999
Total	504,305	772,468
Commercial & industrial loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	252,274
2020	75,997
2019	41,196
2018	38,516
2017	23,534
Prior	52,902
Total	484,419	758,362
Commercial & industrial loans | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
2021	6,334
2020	521
2019	3,591
2018	3,795
2017	548
Prior	5,097
Total	19,886	14,106
Commercial real estate | Owner occupied properties
Financing Receivable, Credit Quality Indicator [Line Items]
2021	56,599
2020	95,805
2019	39,839
2018	15,947
2017	14,763
Prior	69,068
Total	292,021
Commercial real estate | Owner occupied properties | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	56,599
2020	94,373
2019	39,839
2018	15,415
2017	14,763
Prior	62,377
Total	283,366
Commercial real estate | Owner occupied properties | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	1,432
2019	0
2018	532
2017	0
Prior	6,691
Total	8,655
Commercial real estate | Non-owner occupied and multifamily properties
Financing Receivable, Credit Quality Indicator [Line Items]
2021	66,449
2020	79,472
2019	67,466
2018	34,569
2017	30,626
Prior	164,676
Total	443,258
Commercial real estate | Non-owner occupied and multifamily properties | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	66,449
2020	79,472
2019	67,466
2018	34,569
2017	20,273
Prior	164,676
Total	432,905
Commercial real estate | Non-owner occupied and multifamily properties | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	0
2019	0
2018	0
2017	10,353
Prior	0
Total	10,353
Residential | 1-4 family residential properties secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
2021	3,744
2020	9,297
2019	4,302
2018	642
2017	1,774
Prior	9,789
Total	29,548
Residential | 1-4 family residential properties secured by first liens | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	3,744
2020	7,979
2019	3,816
2018	642
2017	1,774
Prior	9,571
Total	27,526
Residential | 1-4 family residential properties secured by first liens | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	1,318
2019	486
2018	0
2017	0
Prior	218
Total	2,022
Residential | 1-4 family residential properties secured by junior liens and revolving secured by 1-4 family first liens
Financing Receivable, Credit Quality Indicator [Line Items]
2021	3,041
2020	2,609
2019	3,817
2018	4,299
2017	264
Prior	4,719
Total	18,749
Residential | 1-4 family residential properties secured by junior liens and revolving secured by 1-4 family first liens | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	3,041
2020	2,609
2019	3,817
2018	4,038
2017	264
Prior	4,705
Total	18,474
Residential | 1-4 family residential properties secured by junior liens and revolving secured by 1-4 family first liens | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	0
2019	0
2018	261
2017	0
Prior	14
Total	275
Residential | 1-4 family residential construction loans
Financing Receivable, Credit Quality Indicator [Line Items]
2021	19,068
2020	1,564
2019	4,329
2018	112
2017	109
Prior	11,204
Total	36,386
Residential | 1-4 family residential construction loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	19,068
2020	1,564
2019	4,329
2018	112
2017	0
Prior	11,204
Total	36,277
Residential | 1-4 family residential construction loans | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	0
2019	0
2018	0
2017	109
Prior	0
Total	109
Other construction, land development and raw land loans
Financing Receivable, Credit Quality Indicator [Line Items]
2021	27,179
2020	20,869
2019	10,849
2018	6,868
2017	144
Prior	7,404
Total	73,313
Other construction, land development and raw land loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	27,179
2020	20,869
2019	10,849
2018	3,697
2017	144
Prior	5,881
Total	68,619
Other construction, land development and raw land loans | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	0
2019	0
2018	3,171
2017	0
Prior	1,523
Total	4,694
Obligations of states and political subdivisions in the US
Financing Receivable, Credit Quality Indicator [Line Items]
2021	52
2020	3,112
2019	3,150
2018	373
2017	2,740
Prior	8,043
Total	17,470
Obligations of states and political subdivisions in the US | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	52
2020	3,112
2019	3,150
2018	373
2017	2,740
Prior	8,043
Total	17,470
Obligations of states and political subdivisions in the US | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	0
2019	0
2018	0
2017	0
Prior	0
Total	0
Agricultural production, including commercial fishing
Financing Receivable, Credit Quality Indicator [Line Items]
2021	16,235
2020	6,598
2019	1,130
2018	1,150
2017	781
Prior	1,679
Total	27,573
Agricultural production, including commercial fishing | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	16,235
2020	6,598
2019	1,130
2018	1,150
2017	781
Prior	1,679
Total	27,573
Agricultural production, including commercial fishing | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	0
2019	0
2018	0
2017	0
Prior	0
Total	0
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	854
2020	936
2019	693
2018	427
2017	318
Prior	1,786
Total	5,014
Consumer | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	854
2020	936
2019	693
2018	427
2017	318
Prior	1,786
Total	5,014
Consumer | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	0
2019	0
2018	0
2017	0
Prior	0
Total	0
Other loans
Financing Receivable, Credit Quality Indicator [Line Items]
2021	495
2020	1,692
2019	439
2018	165
2017	0
Prior	229
Total	3,020	0
Other loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	495
2020	1,692
2019	439
2018	165
2017	0
Prior	229
Total	3,020
Other loans | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	0
2019	0
2018	0
2017	0
Prior	0
Total	$ 0
Real estate construction one-to-four family
Financing Receivable, Credit Quality Indicator [Line Items]
Total		38,180
Real estate construction one-to-four family | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total		37,093
Real estate construction one-to-four family | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
Total		1,087
Real estate construction other
Financing Receivable, Credit Quality Indicator [Line Items]
Total		79,403
Real estate construction other | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total		79,403
Real estate construction other | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
Total		0
Real estate term owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total		162,724
Real estate term owner occupied | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total		152,734
Real estate term owner occupied | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
Total		9,990
Real estate term non-owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total		307,247
Real estate term non-owner occupied | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total		289,555
Real estate term non-owner occupied | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
Total		17,692
Real estate term other
Financing Receivable, Credit Quality Indicator [Line Items]
Total		46,230
Real estate term other | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total		42,900
Real estate term other | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
Total		3,330
Consumer secured by 1st deeds of trust
Financing Receivable, Credit Quality Indicator [Line Items]
Total		15,548
Consumer secured by 1st deeds of trust | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total		15,404
Consumer secured by 1st deeds of trust | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
Total		144
Consumer other
Financing Receivable, Credit Quality Indicator [Line Items]
Total		22,250
Consumer other | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total		22,144
Consumer other | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
Total		$ 106