Loans and Allowance for Credit Losses on Loans HFI - Analysis of Aging by Class of Financing Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Loans held for investment	$ 9,326,024	$ 9,298,212
90 days or  more and accruing interest	12,247	18,415
Nonaccrual loans	31,885	27,431
30-89 days past due and accruing interest
Financing Receivable, Past Due [Line Items]
Loans held for investment	33,619	31,296
Loans current on payments and accruing interest
Financing Receivable, Past Due [Line Items]
Loans held for investment	9,248,273	9,221,070
Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans held for investment	1,693,572	1,645,783
90 days or  more and accruing interest	0	136
Nonaccrual loans	2,163	1,307
Commercial and industrial | 30-89 days past due and accruing interest
Financing Receivable, Past Due [Line Items]
Loans held for investment	822	1,650
Commercial and industrial | Loans current on payments and accruing interest
Financing Receivable, Past Due [Line Items]
Loans held for investment	1,690,587	1,642,690
Construction
Financing Receivable, Past Due [Line Items]
Loans held for investment	1,636,970	1,657,488
90 days or  more and accruing interest	111	0
Nonaccrual loans	2,649	389
Construction | 30-89 days past due and accruing interest
Financing Receivable, Past Due [Line Items]
Loans held for investment	2,127	1,246
Construction | Loans current on payments and accruing interest
Financing Receivable, Past Due [Line Items]
Loans held for investment	1,632,083	1,655,853
Residential real estate: | 1-to-4 family mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment	1,548,614	1,573,121
90 days or  more and accruing interest	10,261	16,639
Nonaccrual loans	7,666	6,476
Residential real estate: | 1-to-4 family mortgage | 30-89 days past due and accruing interest
Financing Receivable, Past Due [Line Items]
Loans held for investment	14,302	15,470
Residential real estate: | 1-to-4 family mortgage | Loans current on payments and accruing interest
Financing Receivable, Past Due [Line Items]
Loans held for investment	1,516,385	1,534,536
Residential real estate: | Residential line of credit
Financing Receivable, Past Due [Line Items]
Loans held for investment	507,652	496,660
90 days or  more and accruing interest	334	131
Nonaccrual loans	853	1,400
Residential real estate: | Residential line of credit | 30-89 days past due and accruing interest
Financing Receivable, Past Due [Line Items]
Loans held for investment	1,407	772
Residential real estate: | Residential line of credit | Loans current on payments and accruing interest
Financing Receivable, Past Due [Line Items]
Loans held for investment	505,058	494,357
Residential real estate: | Multi-family mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment	518,025	479,572
90 days or  more and accruing interest	0	0
Nonaccrual loans	37	42
Residential real estate: | Multi-family mortgage | 30-89 days past due and accruing interest
Financing Receivable, Past Due [Line Items]
Loans held for investment	0	0
Residential real estate: | Multi-family mortgage | Loans current on payments and accruing interest
Financing Receivable, Past Due [Line Items]
Loans held for investment	517,988	479,530
Commercial real estate: | Owner-occupied
Financing Receivable, Past Due [Line Items]
Loans held for investment	1,158,782	1,114,580
90 days or  more and accruing interest	0	0
Nonaccrual loans	5,803	5,410
Commercial real estate: | Owner-occupied | 30-89 days past due and accruing interest
Financing Receivable, Past Due [Line Items]
Loans held for investment	1,316	1,948
Commercial real estate: | Owner-occupied | Loans current on payments and accruing interest
Financing Receivable, Past Due [Line Items]
Loans held for investment	1,151,663	1,107,222
Commercial real estate: | Non-owner occupied
Financing Receivable, Past Due [Line Items]
Loans held for investment	1,881,978	1,964,010
90 days or  more and accruing interest	0	0
Nonaccrual loans	5,554	5,956
Commercial real estate: | Non-owner occupied | 30-89 days past due and accruing interest
Financing Receivable, Past Due [Line Items]
Loans held for investment	3,512	102
Commercial real estate: | Non-owner occupied | Loans current on payments and accruing interest
Financing Receivable, Past Due [Line Items]
Loans held for investment	1,872,912	1,957,952
Consumer and other
Financing Receivable, Past Due [Line Items]
Loans held for investment	380,431	366,998
90 days or  more and accruing interest	1,541	1,509
Nonaccrual loans	7,160	6,451
Consumer and other | 30-89 days past due and accruing interest
Financing Receivable, Past Due [Line Items]
Loans held for investment	10,133	10,108
Consumer and other | Loans current on payments and accruing interest
Financing Receivable, Past Due [Line Items]
Loans held for investment	$ 361,597	$ 348,930