Loans and Allowance for Credit Losses - Loans Outstanding by Class of Financing Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Gross loans	$ 9,365,996	$ 9,298,212
Less: Allowance for credit losses	(138,809)	(134,192)	$ (120,049)	$ (125,559)
Net loans held for investment	9,227,187	9,164,020
Commercial and industrial
Financing Receivable, Past Due [Line Items]
Gross loans	1,671,398	1,645,783
Less: Allowance for credit losses	(11,117)	(11,106)	(12,699)	(15,751)
Construction
Financing Receivable, Past Due [Line Items]
Gross loans	1,697,513	1,657,488
Less: Allowance for credit losses	(41,025)	(39,808)	(31,782)	(28,576)
Residential real estate: | 1-to-4 family mortgage
Financing Receivable, Past Due [Line Items]
Gross loans	1,562,503	1,573,121
Less: Allowance for credit losses	(27,213)	(26,141)	(21,024)	(19,104)
Residential real estate: | Residential line of credit
Financing Receivable, Past Due [Line Items]
Gross loans	497,391	496,660
Less: Allowance for credit losses	(9,034)	(7,494)	(6,545)	(5,903)
Residential real estate: | Multi-family mortgage
Financing Receivable, Past Due [Line Items]
Gross loans	489,379	479,572
Less: Allowance for credit losses	(6,619)	(6,490)	(6,398)	(6,976)
Commercial real estate: | Owner-occupied
Financing Receivable, Past Due [Line Items]
Gross loans	1,136,978	1,114,580
Less: Allowance for credit losses	(7,952)	(7,783)	(8,416)	(12,593)
Commercial real estate: | Non-owner occupied
Financing Receivable, Past Due [Line Items]
Gross loans	1,939,517	1,964,010
Less: Allowance for credit losses	(21,868)	(21,916)	(21,290)	(25,768)
Consumer and other
Financing Receivable, Past Due [Line Items]
Gross loans	371,317	366,998
Less: Allowance for credit losses	$ (13,981)	$ (13,454)	$ (11,895)	$ (10,888)