Loans Held for Investment - Aging (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	$ 7,966,777	$ 7,950,551
Accruing Loans Past Due 90 Days or More		43
30-59 Days
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	28,239	19,039
60-89 Days
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	8,900	9,052
90 Days or More
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	37,813	38,358
Past Due
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	74,952	66,449
Not Past Due
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	7,891,825	7,884,102
Prime Lending | U S Government Agencies Secured
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Accruing Loans Past Due 90 Days or More	24,100	22,000
Unpaid principal balance loans past due 90 days or more	24,900	22,900
Commercial real estate | Non-owner occupied
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	1,938,960	1,921,691
Commercial real estate | Non-owner occupied | 30-59 Days
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	3,994	1,095
Commercial real estate | Non-owner occupied | 60-89 Days
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	3,691	361
Commercial real estate | Non-owner occupied | 90 Days or More
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	862	5,012
Commercial real estate | Non-owner occupied | Past Due
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	8,547	6,468
Commercial real estate | Non-owner occupied | Not Past Due
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	1,930,413	1,915,223
Commercial real estate | Owner occupied
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	1,446,177	1,435,945
Commercial real estate | Owner occupied | 30-59 Days
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	6,352	3,549
Commercial real estate | Owner occupied | 60-89 Days
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	927	124
Commercial real estate | Owner occupied | 90 Days or More
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	3,956	3,869
Commercial real estate | Owner occupied | Past Due
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	11,235	7,542
Commercial real estate | Owner occupied | Not Past Due
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	1,434,942	1,428,403
Commercial and industrial
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	1,499,982	1,541,940
Accruing Loans Past Due 90 Days or More		43
Commercial and industrial | 30-59 Days
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	1,498	2,488
Commercial and industrial | 60-89 Days
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	2,746	7,179
Commercial and industrial | 90 Days or More
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	24,530	23,101
Commercial and industrial | Past Due
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	28,774	32,768
Commercial and industrial | Not Past Due
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	1,471,208	1,509,172
Construction and land development
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	889,941	866,245
Construction and land development | 30-59 Days
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	6,955	3,329
Construction and land development | 60-89 Days
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	111
Construction and land development | 90 Days or More
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	2,600	2,484
Construction and land development | Past Due
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	9,666	5,813
Construction and land development | Not Past Due
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	880,275	860,432
1-4 family residential
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	1,840,008	1,792,602
1-4 family residential | 30-59 Days
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	9,342	8,404
1-4 family residential | 60-89 Days
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	1,415	1,387
1-4 family residential | 90 Days or More
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	5,865	3,892
1-4 family residential | Past Due
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	16,622	13,683
1-4 family residential | Not Past Due
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	1,823,386	1,778,919
Consumer
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	27,486	28,410
Consumer | 30-59 Days
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	98	174
Consumer | 60-89 Days
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	10	1
Consumer | Past Due
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	108	175
Consumer | Not Past Due
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	27,378	28,235
Broker-dealer
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	324,223	363,718
Broker-dealer | Not Past Due
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans	$ 324,223	$ 363,718