Loans and Allowance for Credit Losses - Schedule of Age Analysis of Past Due Loans, Excluding Loans Acquired, Segregated by Class of Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Financing Receivable, Past Due [Line Items]
Loans	$ 17,932,883	$ 17,492,179
90 Days Past Due & Accruing	647	948
Gross 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	103,416	65,210
90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	111,475	83,345
Total Past Due
Financing Receivable, Past Due [Line Items]
Loans	214,891	148,555
Current
Financing Receivable, Past Due [Line Items]
Loans	17,717,992	17,343,624
Consumer
Financing Receivable, Past Due [Line Items]
Loans	268,997	291,232
90 Days Past Due & Accruing	502	697
Consumer | Gross 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	3,108	3,487
Consumer | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	817	917
Consumer | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans	3,925	4,404
Consumer | Current
Financing Receivable, Past Due [Line Items]
Loans	265,072	286,828
Consumer | Credit cards
Financing Receivable, Past Due [Line Items]
Loans	172,610	175,760
90 Days Past Due & Accruing	502	697
Consumer | Credit cards | Gross 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	2,448	2,414
Consumer | Credit cards | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	591	751
Consumer | Credit cards | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans	3,039	3,165
Consumer | Credit cards | Current
Financing Receivable, Past Due [Line Items]
Loans	169,571	172,595
Consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Loans	96,387	115,472
90 Days Past Due & Accruing	0	0
Consumer | Other consumer | Gross 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	660	1,073
Consumer | Other consumer | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	226	166
Consumer | Other consumer | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans	886	1,239
Consumer | Other consumer | Current
Financing Receivable, Past Due [Line Items]
Loans	95,501	114,233
Real Estate
Financing Receivable, Past Due [Line Items]
Loans	13,952,669	13,771,225
90 Days Past Due & Accruing	145	148
Real Estate | Gross 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	92,450	58,954
Real Estate | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	96,595	71,155
Real Estate | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans	189,045	130,109
Real Estate | Current
Financing Receivable, Past Due [Line Items]
Loans	13,763,624	13,641,116
Real Estate | Construction and development
Financing Receivable, Past Due [Line Items]
Loans	2,621,859	2,873,807
90 Days Past Due & Accruing	0	0
Real Estate | Construction and development | Gross 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	26,609	13,344
Real Estate | Construction and development | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	37,179	17,418
Real Estate | Construction and development | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans	63,788	30,762
Real Estate | Construction and development | Current
Financing Receivable, Past Due [Line Items]
Loans	2,558,071	2,843,045
Real Estate | Single family residential
Financing Receivable, Past Due [Line Items]
Loans	2,566,162	2,607,450
90 Days Past Due & Accruing	0	0
Real Estate | Single family residential | Gross 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	37,398	34,731
Real Estate | Single family residential | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	15,895	15,690
Real Estate | Single family residential | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans	53,293	50,421
Real Estate | Single family residential | Current
Financing Receivable, Past Due [Line Items]
Loans	2,512,869	2,557,029
Real Estate | Other commercial
Financing Receivable, Past Due [Line Items]
Loans	8,764,648	8,289,968
90 Days Past Due & Accruing	145	148
Real Estate | Other commercial | Gross 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	28,443	10,879
Real Estate | Other commercial | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	43,521	38,047
Real Estate | Other commercial | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans	71,964	48,926
Real Estate | Other commercial | Current
Financing Receivable, Past Due [Line Items]
Loans	8,692,684	8,241,042
Commercial
Financing Receivable, Past Due [Line Items]
Loans	2,854,948	2,688,639
90 Days Past Due & Accruing	0	103
Commercial | Gross 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	7,595	2,769
Commercial | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	14,063	11,270
Commercial | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans	21,658	14,039
Commercial | Current
Financing Receivable, Past Due [Line Items]
Loans	2,833,290	2,674,600
Commercial | Commercial
Financing Receivable, Past Due [Line Items]
Loans	2,521,440	2,382,339
90 Days Past Due & Accruing	0	103
Commercial | Commercial | Gross 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	6,500	2,755
Commercial | Commercial | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	13,572	10,672
Commercial | Commercial | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans	20,072	13,427
Commercial | Commercial | Current
Financing Receivable, Past Due [Line Items]
Loans	2,501,368	2,368,912
Commercial | Agricultural
Financing Receivable, Past Due [Line Items]
Loans	333,508	306,300
90 Days Past Due & Accruing	0	0
Commercial | Agricultural | Gross 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,095	14
Commercial | Agricultural | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	491	598
Commercial | Agricultural | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,586	612
Commercial | Agricultural | Current
Financing Receivable, Past Due [Line Items]
Loans	331,922	305,688
Other
Financing Receivable, Past Due [Line Items]
Loans	856,269	741,083
90 Days Past Due & Accruing	0	0
Other | Gross 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	263	0
Other | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	3
Other | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans	263	3
Other | Current
Financing Receivable, Past Due [Line Items]
Loans	$ 856,006	$ 741,080