v3.26.1
Loans Held-for-Investment and Allowance for Credit Losses - Schedule of Past Due Loans (Detail) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 8,346,931 $ 8,158,276
Total Loans 8,346,931 8,158,276
Total 90 Days Past Due Still Accruing 958 892
Commercial & Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,087,656 1,116,461
Municipal [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 419,070 342,501
Construction & Development [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,191,082 1,157,865
Farm [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 344,483 327,625
Non-Owner Occupied CRE [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 831,929 832,816
Owner Occupied CRE [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,144,093 1,120,608
Residential [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 2,322,000 2,285,830
Auto [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 776,433 732,351
Non-Auto [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 148,399 146,443
Commercial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 1,506,726 1,458,962
Commercial [Member] | Commercial & Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 1,087,656 1,116,461
Commercial [Member] | Municipal [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 419,070 342,501
Total 90 Days Past Due Still Accruing 0 0
Agriculture [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 81,786 95,776
Total Loans 81,786 95,776
Total 90 Days Past Due Still Accruing 0 0
Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 5,833,587 5,724,744
Real Estate [Member] | Construction & Development [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 1,191,082 1,157,865
Total 90 Days Past Due Still Accruing 394 404
Real Estate [Member] | Farm [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 344,483 327,625
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 831,929 832,816
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 1,144,093 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 2,322,000 2,285,830
Total 90 Days Past Due Still Accruing 164 0
Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 924,832 878,794
Consumer [Member] | Auto [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 776,433 732,351
Total 90 Days Past Due Still Accruing 0 0
Consumer [Member] | Non-Auto [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 148,399 146,443
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] 39,207 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] 5,941 3,760
15-59 Days Past Due [Member] | Commercial [Member] | Municipal [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due [1] 320 1,471
15-59 Days Past Due [Member] | Agriculture [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due [1] 871 426
15-59 Days Past Due [Member] | Real Estate [Member] | Construction & Development [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due [1] 2,510 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] 460 915
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] 613 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] 992 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] 26,566 21,505
15-59 Days Past Due [Member] | Consumer [Member] | Auto [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due [1] 627 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] 307 362
60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 7,743 18,841
60-89 Days Past Due [Member] | Commercial [Member] | Commercial & Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,812 850
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 183 0
60-89 Days Past Due [Member] | Real Estate [Member] | Construction & Development [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 263 605
60-89 Days Past Due [Member] | Real Estate [Member] | Farm [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 0 126
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 877 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 566 13,631
60-89 Days Past Due [Member] | Real Estate [Member] | Residential [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 3,869 3,493
60-89 Days Past Due [Member] | Consumer [Member] | Auto [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 148 92
60-89 Days Past Due [Member] | Consumer [Member] | Non-Auto [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 25 27
Greater than 90 Days [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 15,083 7,870
Greater than 90 Days [Member] | Commercial [Member] | Commercial & Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 3,670 876
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 808 739
Greater than 90 Days [Member] | Real Estate [Member] | Construction & Development [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 2,486 544
Greater than 90 Days [Member] | Real Estate [Member] | Farm [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 0 789
Greater than 90 Days [Member] | Real Estate [Member] | Non-Owner Occupied CRE [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 2,630 0
Greater than 90 Days [Member] | Real Estate [Member] | Owner Occupied CRE [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 649 1,536
Greater than 90 Days [Member] | Real Estate [Member] | Residential [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 4,830 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 10 46
Total Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 62,033 78,038
Total Past Due [Member] | Commercial [Member] | Commercial & Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 11,423 5,486
Total Past Due [Member] | Commercial [Member] | Municipal [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 320 1,488
Total Past Due [Member] | Agriculture [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,862 1,165
Total Past Due [Member] | Real Estate [Member] | Construction & Development [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 5,259 11,805
Total Past Due [Member] | Real Estate [Member] | Farm [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 460 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 4,120 1,489
Total Past Due [Member] | Real Estate [Member] | Owner Occupied CRE [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 2,207 24,749
Total Past Due [Member] | Real Estate [Member] | Residential [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 35,265 28,338
Total Past Due [Member] | Consumer [Member] | Auto [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 775 1,253
Total Past Due [Member] | Consumer [Member] | Non-Auto [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 342 435
Current [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 8,284,898 8,080,238
Current [Member] | Commercial [Member] | Commercial & Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,076,233 1,110,975
Current [Member] | Commercial [Member] | Municipal [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 418,750 341,013
Current [Member] | Agriculture [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 79,924 94,611
Current [Member] | Real Estate [Member] | Construction & Development [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,185,823 1,146,060
Current [Member] | Real Estate [Member] | Farm [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 344,023 325,795
Current [Member] | Real Estate [Member] | Non-Owner Occupied CRE [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 827,809 831,327
Current [Member] | Real Estate [Member] | Owner Occupied CRE [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,141,886 1,095,859
Current [Member] | Real Estate [Member] | Residential [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 2,286,735 2,257,492
Current [Member] | Consumer [Member] | Auto [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 775,658 731,098
Current [Member] | Consumer [Member] | Non-Auto [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 148,057 $ 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.