v3.26.1
Loans and Allowance for Credit Losses - Allowance for Credit Losses on Loans by Category of Loan (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Financing Receivable Allowance For Credit Losses [Line Items]    
Allowance for credit losses on loans, beginning balance $ 333,742 $ 351,805
Allowance on PCD loans at acquisition 52,146  
Allowance on PSLs at acquisition 39,261  
Charge-offs (42,480) (3,943)
Recoveries 1,171 1,239
Net (charge-offs) recoveries (41,309) (2,704)
Allowance for credit losses on loans, ending balance 383,840 349,101
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Allowance for credit losses on loans, beginning balance 69,817 77,984
Allowance on PCD loans at acquisition 5,725  
Allowance on PSLs at acquisition 5,342  
Provision for credit losses on loans (4,757) 2,440
Recoveries   156
Net (charge-offs) recoveries   156
Allowance for credit losses on loans, ending balance 76,127 80,580
Real Estate [Member] | Agriculture [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Allowance for credit losses on loans, beginning balance 23,438 27,693
Allowance on PCD loans at acquisition 927  
Allowance on PSLs at acquisition 142  
Provision for credit losses on loans (1,242) (1,596)
Charge-offs (62)  
Recoveries 10  
Net (charge-offs) recoveries (52)  
Allowance for credit losses on loans, ending balance 23,213 26,097
Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Allowance for credit losses on loans, beginning balance 76,596 80,735
Allowance on PCD loans at acquisition 1,353  
Allowance on PSLs at acquisition 6,213  
Provision for credit losses on loans (8,166) 4,211
Charge-offs (899) (1,057)
Recoveries 37 6
Net (charge-offs) recoveries (862) (1,051)
Allowance for credit losses on loans, ending balance 75,134 83,895
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Allowance for credit losses on loans, beginning balance 77,251 92,147
Allowance on PCD loans at acquisition 12,423  
Allowance on PSLs at acquisition 11,696  
Provision for credit losses on loans (6,075) (1,662)
Charge-offs (221) (387)
Recoveries 342 209
Net (charge-offs) recoveries 121 (178)
Allowance for credit losses on loans, ending balance 95,416 90,307
Commercial and Industrial [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Allowance for credit losses on loans, beginning balance 77,939 65,500
Allowance on PCD loans at acquisition 30,809  
Allowance on PSLs at acquisition 13,308  
Provision for credit losses on loans 21,904 (4,996)
Charge-offs (39,676) (942)
Recoveries 451 612
Net (charge-offs) recoveries (39,225) (330)
Allowance for credit losses on loans, ending balance 104,735 60,174
Consumer and Other [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Allowance for credit losses on loans, beginning balance 8,701 7,746
Allowance on PCD loans at acquisition 909  
Allowance on PSLs at acquisition 2,560  
Provision for credit losses on loans (1,664) 1,603
Charge-offs (1,622) (1,557)
Recoveries 331 256
Net (charge-offs) recoveries (1,291) (1,301)
Allowance for credit losses on loans, ending balance $ 9,215 $ 8,048