Loans and Allowance for Credit Losses - Analysis of Aging by Class of Financing Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Loans held for investment	$ 9,365,996	$ 9,298,212
90 days or  more and accruing interest	12,580	18,415
Nonaccrual loans	32,900	27,431
30-89 days past due and accruing interest
Financing Receivable, Past Due [Line Items]
Loans held for investment	25,077	31,296
Loans current on payments and accruing interest
Financing Receivable, Past Due [Line Items]
Loans held for investment	9,295,439	9,221,070
Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans held for investment	1,671,398	1,645,783
90 days or  more and accruing interest	42	136
Nonaccrual loans	2,413	1,307
Commercial and industrial | 30-89 days past due and accruing interest
Financing Receivable, Past Due [Line Items]
Loans held for investment	574	1,650
Commercial and industrial | Loans current on payments and accruing interest
Financing Receivable, Past Due [Line Items]
Loans held for investment	1,668,369	1,642,690
Construction
Financing Receivable, Past Due [Line Items]
Loans held for investment	1,697,513	1,657,488
90 days or  more and accruing interest	0	0
Nonaccrual loans	382	389
Construction | 30-89 days past due and accruing interest
Financing Receivable, Past Due [Line Items]
Loans held for investment	2,708	1,246
Construction | Loans current on payments and accruing interest
Financing Receivable, Past Due [Line Items]
Loans held for investment	1,694,423	1,655,853
Residential real estate: | 1-to-4 family mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment	1,562,503	1,573,121
90 days or  more and accruing interest	11,505	16,639
Nonaccrual loans	9,088	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	13,348	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	1,528,562	1,534,536
Residential real estate: | Residential line of credit
Financing Receivable, Past Due [Line Items]
Loans held for investment	497,391	496,660
90 days or  more and accruing interest	158	131
Nonaccrual loans	924	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	678	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	495,631	494,357
Residential real estate: | Multi-family mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment	489,379	479,572
90 days or  more and accruing interest	0	0
Nonaccrual loans	39	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	489,340	479,530
Commercial real estate: | Owner-occupied
Financing Receivable, Past Due [Line Items]
Loans held for investment	1,136,978	1,114,580
90 days or  more and accruing interest	0	0
Nonaccrual loans	7,211	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	851	1,948
Commercial real estate: | Owner-occupied | Loans current on payments and accruing interest
Financing Receivable, Past Due [Line Items]
Loans held for investment	1,128,916	1,107,222
Commercial real estate: | Non-owner occupied
Financing Receivable, Past Due [Line Items]
Loans held for investment	1,939,517	1,964,010
90 days or  more and accruing interest	0	0
Nonaccrual loans	5,802	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	0	102
Commercial real estate: | Non-owner occupied | Loans current on payments and accruing interest
Financing Receivable, Past Due [Line Items]
Loans held for investment	1,933,715	1,957,952
Consumer and other
Financing Receivable, Past Due [Line Items]
Loans held for investment	371,317	366,998
90 days or  more and accruing interest	875	1,509
Nonaccrual loans	7,041	6,451
Consumer and other | 30-89 days past due and accruing interest
Financing Receivable, Past Due [Line Items]
Loans held for investment	6,918	10,108
Consumer and other | Loans current on payments and accruing interest
Financing Receivable, Past Due [Line Items]
Loans held for investment	$ 356,483	$ 348,930