Loans and Allowance for Credit Losses - Age Analysis of Past Due Loans, Excluding Loans Acquired, Segregated by Class of Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 16,845,670	$ 16,142,124
90 Days Past Due & Accruing	1,147	507
Gross 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	55,666	38,416
90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	42,701	26,886
Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	98,367	65,302
Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	16,747,303	16,076,822
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	318,666	349,810
90 Days Past Due & Accruing	791	225
Consumer | Gross 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	3,205	2,149
Consumer | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	1,108	623
Consumer | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	4,313	2,772
Consumer | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	314,353	347,038
Consumer | Credit cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	191,204	196,928
90 Days Past Due & Accruing	791	225
Consumer | Credit cards | Gross 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	1,734	1,297
Consumer | Credit cards | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	892	409
Consumer | Credit cards | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,626	1,706
Consumer | Credit cards | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	188,578	195,222
Consumer | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	127,462	152,882
90 Days Past Due & Accruing	0	0
Consumer | Other consumer | Gross 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	1,471	852
Consumer | Other consumer | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	216	214
Consumer | Other consumer | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	1,687	1,066
Consumer | Other consumer | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	125,775	151,816
Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	13,338,186	12,581,262
90 Days Past Due & Accruing	7	106
Real Estate | Gross 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	38,570	31,061
Real Estate | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	18,324	18,618
Real Estate | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	56,894	49,679
Real Estate | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	13,281,292	12,531,583
Real Estate | Construction and development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	3,144,220	2,566,649
90 Days Past Due & Accruing	0	0
Real Estate | Construction and development | Gross 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	3,171	4,677
Real Estate | Construction and development | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,190	443
Real Estate | Construction and development | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	5,361	5,120
Real Estate | Construction and development | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	3,138,859	2,561,529
Real Estate | Single family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,641,556	2,546,115
90 Days Past Due & Accruing	7	106
Real Estate | Single family residential | Gross 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	30,697	23,625
Real Estate | Single family residential | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	12,522	11,075
Real Estate | Single family residential | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	43,219	34,700
Real Estate | Single family residential | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,598,337	2,511,415
Real Estate | Other commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	7,552,410	7,468,498
90 Days Past Due & Accruing	0	0
Real Estate | Other commercial | Gross 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	4,702	2,759
Real Estate | Other commercial | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	3,612	7,100
Real Estate | Other commercial | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	8,314	9,859
Real Estate | Other commercial | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	7,544,096	7,458,639
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,722,886	2,837,913
90 Days Past Due & Accruing	349	176
Commercial | Gross 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	13,891	5,145
Commercial | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	23,266	7,642
Commercial | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	37,157	12,787
Commercial | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,685,729	2,825,126
Commercial | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,490,176	2,632,290
90 Days Past Due & Accruing	349	176
Commercial | Commercial | Gross 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	13,799	5,034
Commercial | Commercial | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	22,750	7,575
Commercial | Commercial | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	36,549	12,609
Commercial | Commercial | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,453,627	2,619,681
Commercial | Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	232,710	205,623
90 Days Past Due & Accruing	0	0
Commercial | Agricultural | Gross 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	92	111
Commercial | Agricultural | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	516	67
Commercial | Agricultural | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	608	178
Commercial | Agricultural | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	232,102	205,445
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	465,932	373,139
90 Days Past Due & Accruing	0	0
Other | Gross 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	0	61
Other | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	3	3
Other | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	3	64
Other | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 465,929	$ 373,075