Loans and Allowance for Loan Losses ("ALLL") - Allowance for Loan Losses (Details) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
		Jun. 30, 2022	Jun. 30, 2022
Allowance for loan losses
Beginning balance	[1]	$ 55,231	$ 58,375
Charge-offs		(4,448)	(8,060)
Recoveries		3,344	5,875
Provision (credit)		1,690	1,374
Ending balance	[1]	55,817	55,817
Allowance for Credit Losses on Off-Balance Sheet
Beginning balance		4,875	0
Provision (credit)		445	136
Ending balance		5,320	5,320
Accounting Standards Update 201613 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for loan losses
Beginning balance			(1,747)
Allowance for Credit Losses on Off-Balance Sheet
Beginning balance			5,184
Commercial
Allowance for loan losses
Beginning balance		9,981	20,352
Charge-offs		(581)	(790)
Recoveries		0	755
Provision (credit)		1,520	816
Ending balance		10,920	10,920
Allowance for Credit Losses on Off-Balance Sheet
Beginning balance		66	0
Provision (credit)		(3)	(44)
Ending balance		63	63
Commercial | Accounting Standards Update 201613 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for loan losses
Beginning balance			(10,213)
Allowance for Credit Losses on Off-Balance Sheet
Beginning balance			107
Commercial line of credit
Allowance for loan losses
Beginning balance		9,361	0
Charge-offs		(750)	(1,971)
Recoveries		1,758	1,779
Provision (credit)		898	2,593
Ending balance		11,267	11,267
Allowance for Credit Losses on Off-Balance Sheet
Beginning balance		153	0
Provision (credit)		(153)	(44)
Ending balance		0	0
Commercial line of credit | Accounting Standards Update 201613 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for loan losses
Beginning balance			8,866
Allowance for Credit Losses on Off-Balance Sheet
Beginning balance			44
Energy
Allowance for loan losses
Beginning balance		7,507	9,229
Charge-offs		(2,900)	(3,967)
Recoveries		0	1,754
Provision (credit)		1,821	(549)
Ending balance		6,428	6,428
Allowance for Credit Losses on Off-Balance Sheet
Beginning balance		258	0
Provision (credit)		212	205
Ending balance		470	470
Energy | Accounting Standards Update 201613 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for loan losses
Beginning balance			(39)
Allowance for Credit Losses on Off-Balance Sheet
Beginning balance			265
Commercial real estate
Allowance for loan losses
Beginning balance		18,628	19,119
Charge-offs		0	(1,102)
Recoveries		1,585	1,585
Provision (credit)		(3,171)	(2,374)
Ending balance		17,042	17,042
Allowance for Credit Losses on Off-Balance Sheet
Beginning balance		753	0
Provision (credit)		(96)	(54)
Ending balance		657	657
Commercial real estate | Accounting Standards Update 201613 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for loan losses
Beginning balance			(186)
Allowance for Credit Losses on Off-Balance Sheet
Beginning balance			711
Construction and land development
Allowance for loan losses
Beginning balance		3,678	3,749
Charge-offs		0	0
Recoveries		0	0
Provision (credit)		240	252
Ending balance		3,918	3,918
Allowance for Credit Losses on Off-Balance Sheet
Beginning balance		3,514	0
Provision (credit)		502	102
Ending balance		4,016	4,016
Construction and land development | Accounting Standards Update 201613 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for loan losses
Beginning balance			(83)
Allowance for Credit Losses on Off-Balance Sheet
Beginning balance			3,914
Residential real estate
Allowance for loan losses
Beginning balance		3,089	5,598
Charge-offs		(217)	(217)
Recoveries		0	0
Provision (credit)		262	305
Ending balance		3,134	3,134
Allowance for Credit Losses on Off-Balance Sheet
Beginning balance		4	0
Provision (credit)		0	(1)
Ending balance		4	4
Residential real estate | Accounting Standards Update 201613 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for loan losses
Beginning balance			(2,552)
Allowance for Credit Losses on Off-Balance Sheet
Beginning balance			5
Multifamily real estate
Allowance for loan losses
Beginning balance		2,342	0
Charge-offs		0	0
Recoveries		0	0
Provision (credit)		85	(38)
Ending balance		2,427	2,427
Allowance for Credit Losses on Off-Balance Sheet
Beginning balance		116	0
Provision (credit)		(7)	(28)
Ending balance		109	109
Multifamily real estate | Accounting Standards Update 201613 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for loan losses
Beginning balance			2,465
Allowance for Credit Losses on Off-Balance Sheet
Beginning balance			137
Consumer
Allowance for loan losses
Beginning balance		645	328
Charge-offs		0	(13)
Recoveries		1	2
Provision (credit)		35	369
Ending balance		681	681
Allowance for Credit Losses on Off-Balance Sheet
Beginning balance		11	0
Provision (credit)		(10)	0
Ending balance		$ 1	1
Consumer | Accounting Standards Update 201613 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for loan losses
Beginning balance			(5)
Allowance for Credit Losses on Off-Balance Sheet
Beginning balance			$ 1

[1] As of December 31, 2021, this line represents the allowance for loan and   lease losses. See further discussion in “Note 1: Nature of Operations and Summary of Significant Accounting Policies” in the Notes to Condensed Consolidated Financial Statements (unaudited).