v3.26.1
LHFI and ACL, LHFI - Aging Analysis of Past Due and Nonaccrual LHFI by Loan Type (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI $ 13,877,971 $ 13,674,233
Past Due 30 to 59 Days [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 24,011 33,490
Past Due 60 to 89 Days [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 9,337 10,671
Past Due 90 Days or More [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 49,015 45,313
Financial Asset, Past Due [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 82,363 89,474
Current Loans [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 13,795,608 13,584,759
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 560,143 549,353
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Past Due 30 to 59 Days [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 176 786
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Past Due 60 to 89 Days [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 0 139
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 104 0
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Financial Asset, Past Due [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 280 925
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Current Loans [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 559,863 548,428
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 712,532 704,514
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 30 to 59 Days [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 4,485 6,118
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 60 to 89 Days [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 2,381 1,238
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 3,307 3,868
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Financial Asset, Past Due [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 10,173 11,224
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Current Loans [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 702,359 693,290
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 2,347,195 2,351,675
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member] | Past Due 30 to 59 Days [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 14,329 19,838
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member] | Past Due 60 to 89 Days [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 5,412 8,340
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 32,228 34,838
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member] | Financial Asset, Past Due [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 51,969 63,016
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member] | Current Loans [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 2,295,226 2,288,659
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 3,289,115 3,304,523
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 30 to 59 Days [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 356 1,798
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 60 to 89 Days [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 742 185
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 10,869 3,829
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member] | Financial Asset, Past Due [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 11,967 5,812
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member] | Current Loans [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 3,277,148 3,298,711
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 2,079,222 2,124,272
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member] | Past Due 30 to 59 Days [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 26 1
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member] | Past Due 60 to 89 Days [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 0 0
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 316 316
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member] | Financial Asset, Past Due [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 342 317
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member] | Current Loans [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 2,078,880 2,123,955
Commercial and Industrial Loans [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 2,166,425 1,999,464
Commercial and Industrial Loans [Member] | Past Due 30 to 59 Days [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 2,592 2,828
Commercial and Industrial Loans [Member] | Past Due 60 to 89 Days [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 280 352
Commercial and Industrial Loans [Member] | Past Due 90 Days or More [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 1,369 1,014
Commercial and Industrial Loans [Member] | Financial Asset, Past Due [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 4,241 4,194
Commercial and Industrial Loans [Member] | Current Loans [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 2,162,184 1,995,270
Other Construction Financing Receivable [Member] | Other Loans Secured by Real Estate [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 645,555 595,238
Other Construction Financing Receivable [Member] | Other Loans Secured by Real Estate [Member] | Past Due 30 to 59 Days [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 0 0
Other Construction Financing Receivable [Member] | Other Loans Secured by Real Estate [Member] | Past Due 60 to 89 Days [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 0 0
Other Construction Financing Receivable [Member] | Other Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 0 0
Other Construction Financing Receivable [Member] | Other Loans Secured by Real Estate [Member] | Financial Asset, Past Due [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 0 0
Other Construction Financing Receivable [Member] | Other Loans Secured by Real Estate [Member] | Current Loans [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 645,555 595,238
Consumer Loans [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 159,443 163,754
Consumer Loans [Member] | Past Due 30 to 59 Days [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 1,485 2,109
Consumer Loans [Member] | Past Due 60 to 89 Days [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 522 402
Consumer Loans [Member] | Past Due 90 Days or More [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 822 453
Consumer Loans [Member] | Financial Asset, Past Due [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 2,829 2,964
Consumer Loans [Member] | Current Loans [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 156,614 160,790
State and Other Political Subdivision Loans [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 1,059,624 1,061,584
State and Other Political Subdivision Loans [Member] | Past Due 30 to 59 Days [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 0 8
State and Other Political Subdivision Loans [Member] | Past Due 60 to 89 Days [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 0 0
State and Other Political Subdivision Loans [Member] | Past Due 90 Days or More [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 0 995
State and Other Political Subdivision Loans [Member] | Financial Asset, Past Due [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 0 1,003
State and Other Political Subdivision Loans [Member] | Current Loans [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 1,059,624 1,060,581
Other Commercial Loans and Leases [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 858,717 819,856
Other Commercial Loans and Leases [Member] | Past Due 30 to 59 Days [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 562 4
Other Commercial Loans and Leases [Member] | Past Due 60 to 89 Days [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 0 15
Other Commercial Loans and Leases [Member] | Past Due 90 Days or More [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 0 0
Other Commercial Loans and Leases [Member] | Financial Asset, Past Due [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI 562 19
Other Commercial Loans and Leases [Member] | Current Loans [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total LHFI $ 858,155 $ 819,837