v3.26.1
Loans Held-for-Investment and Allowance for Credit Losses - Schedule of Past Due Loans (Detail) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 8,285,120 $ 8,158,276
Total Loans 8,285,120 8,158,276
Total 90 Days Past Due Still Accruing 218 892
Commercial & Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,149,931 1,116,461
Municipal [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 384,473 342,501
Construction & Development [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,169,037 1,157,865
Farm [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 329,151 327,625
Non-Owner Occupied CRE [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 825,771 832,816
Owner Occupied CRE [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,132,114 1,120,608
Residential [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 2,322,097 2,285,830
Auto [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 751,283 732,351
Non-Auto [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 143,680 146,443
Commercial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 1,534,404 1,458,962
Commercial [Member] | Commercial & Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 1,149,931 1,116,461
Commercial [Member] | Municipal [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 384,473 342,501
Total 90 Days Past Due Still Accruing 0 0
Agriculture [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 77,583 95,776
Total Loans 77,583 95,776
Total 90 Days Past Due Still Accruing 0 0
Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 5,778,170 5,724,744
Real Estate [Member] | Construction & Development [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 1,169,037 1,157,865
Total 90 Days Past Due Still Accruing 0 404
Real Estate [Member] | Farm [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 329,151 327,625
Total 90 Days Past Due Still Accruing 0 0
Real Estate [Member] | Non-Owner Occupied CRE [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 825,771 832,816
Total 90 Days Past Due Still Accruing 0 0
Real Estate [Member] | Owner Occupied CRE [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 1,132,114 1,120,608
Total 90 Days Past Due Still Accruing 0 488
Real Estate [Member] | Residential [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 2,322,097 2,285,830
Total 90 Days Past Due Still Accruing 218 0
Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 894,963 878,794
Consumer [Member] | Auto [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 751,283 732,351
Total 90 Days Past Due Still Accruing 0 0
Consumer [Member] | Non-Auto [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 143,680 146,443
Total 90 Days Past Due Still Accruing 0 0
15-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due [1] 54,584 51,327
15-59 Days Past Due [Member] | Commercial [Member] | Commercial & Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due [1] 4,038 3,760
15-59 Days Past Due [Member] | Commercial [Member] | Municipal [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due [1] 654 1,471
15-59 Days Past Due [Member] | Agriculture [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due [1] 1,019 426
15-59 Days Past Due [Member] | Real Estate [Member] | Construction & Development [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due [1] 11,858 10,656
15-59 Days Past Due [Member] | Real Estate [Member] | Farm [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due [1] 430 915
15-59 Days Past Due [Member] | Real Estate [Member] | Non-Owner Occupied CRE [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due [1] 4,170 1,489
15-59 Days Past Due [Member] | Real Estate [Member] | Owner Occupied CRE [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due [1] 5,721 9,582
15-59 Days Past Due [Member] | Real Estate [Member] | Residential [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due [1] 25,398 21,505
15-59 Days Past Due [Member] | Consumer [Member] | Auto [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due [1] 1,045 1,161
15-59 Days Past Due [Member] | Consumer [Member] | Non-Auto [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due [1] 251 362
60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 5,817 18,841
60-89 Days Past Due [Member] | Commercial [Member] | Commercial & Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 310 850
60-89 Days Past Due [Member] | Commercial [Member] | Municipal [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 0 17
60-89 Days Past Due [Member] | Agriculture [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 36 0
60-89 Days Past Due [Member] | Real Estate [Member] | Construction & Development [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 332 605
60-89 Days Past Due [Member] | Real Estate [Member] | Farm [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 126 126
60-89 Days Past Due [Member] | Real Estate [Member] | Non-Owner Occupied CRE [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 199 0
60-89 Days Past Due [Member] | Real Estate [Member] | Owner Occupied CRE [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 0 13,631
60-89 Days Past Due [Member] | Real Estate [Member] | Residential [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 4,624 3,493
60-89 Days Past Due [Member] | Consumer [Member] | Auto [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 180 92
60-89 Days Past Due [Member] | Consumer [Member] | Non-Auto [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 10 27
Greater than 90 Days [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 7,717 7,870
Greater than 90 Days [Member] | Commercial [Member] | Commercial & Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,204 876
Greater than 90 Days [Member] | Commercial [Member] | Municipal [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 0 0
Greater than 90 Days [Member] | Agriculture [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 472 739
Greater than 90 Days [Member] | Real Estate [Member] | Construction & Development [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 539 544
Greater than 90 Days [Member] | Real Estate [Member] | Farm [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 472 789
Greater than 90 Days [Member] | Real Estate [Member] | Non-Owner Occupied CRE [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 0 0
Greater than 90 Days [Member] | Real Estate [Member] | Owner Occupied CRE [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 722 1,536
Greater than 90 Days [Member] | Real Estate [Member] | Residential [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 4,217 3,340
Greater than 90 Days [Member] | Consumer [Member] | Auto [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 0 0
Greater than 90 Days [Member] | Consumer [Member] | Non-Auto [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 91 46
Total Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 68,118 78,038
Total Past Due [Member] | Commercial [Member] | Commercial & Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 5,552 5,486
Total Past Due [Member] | Commercial [Member] | Municipal [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 654 1,488
Total Past Due [Member] | Agriculture [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,527 1,165
Total Past Due [Member] | Real Estate [Member] | Construction & Development [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 12,729 11,805
Total Past Due [Member] | Real Estate [Member] | Farm [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,028 1,830
Total Past Due [Member] | Real Estate [Member] | Non-Owner Occupied CRE [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 4,369 1,489
Total Past Due [Member] | Real Estate [Member] | Owner Occupied CRE [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 6,443 24,749
Total Past Due [Member] | Real Estate [Member] | Residential [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 34,239 28,338
Total Past Due [Member] | Consumer [Member] | Auto [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,225 1,253
Total Past Due [Member] | Consumer [Member] | Non-Auto [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 352 435
Current [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 8,217,002 8,080,238
Current [Member] | Commercial [Member] | Commercial & Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,144,379 1,110,975
Current [Member] | Commercial [Member] | Municipal [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 383,819 341,013
Current [Member] | Agriculture [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 76,056 94,611
Current [Member] | Real Estate [Member] | Construction & Development [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,156,308 1,146,060
Current [Member] | Real Estate [Member] | Farm [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 328,123 325,795
Current [Member] | Real Estate [Member] | Non-Owner Occupied CRE [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 821,402 831,327
Current [Member] | Real Estate [Member] | Owner Occupied CRE [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,125,671 1,095,859
Current [Member] | Real Estate [Member] | Residential [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 2,287,858 2,257,492
Current [Member] | Consumer [Member] | Auto [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 750,058 731,098
Current [Member] | Consumer [Member] | Non-Auto [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 143,328 $ 146,008
[1] The Company monitors commercial, agricultural and real estate loans after such loans are 15 days past due. Consumer loans are monitored after such loans are 30 days past due.