v3.26.1
Allowance for Credit Losses, Credit Quality and Other - Summary of Aging Analysis for Loans Receivable (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans $ 15,633,628 $ 15,686,209
Accruing Loans Past Due 90 Days or More 2,481 6,980
Loans Past Due 30-59 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 14,474 85,414
Loans Past Due 60-89 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 5,657 17,853
Loans Past Due 90 Days or More    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 182,120 84,982
Total Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 202,251 188,249
Current Loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 15,431,377 15,497,960
Commercial real estate loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 8,330,179 8,349,517
Commercial real estate loans | Non-farm/non-residential    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 5,395,529 5,290,112
Accruing Loans Past Due 90 Days or More 751 0
Commercial real estate loans | Non-farm/non-residential | Loans Past Due 30-59 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 1,321 37,448
Commercial real estate loans | Non-farm/non-residential | Loans Past Due 60-89 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 248 4,723
Commercial real estate loans | Non-farm/non-residential | Loans Past Due 90 Days or More    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 57,518 21,685
Commercial real estate loans | Non-farm/non-residential | Total Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 59,087 63,856
Commercial real estate loans | Non-farm/non-residential | Current Loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 5,336,442 5,226,256
Commercial real estate loans | Construction/land development    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 2,613,604 2,726,993
Accruing Loans Past Due 90 Days or More 600 405
Commercial real estate loans | Construction/land development | Loans Past Due 30-59 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 105 207
Commercial real estate loans | Construction/land development | Loans Past Due 60-89 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 244 7,208
Commercial real estate loans | Construction/land development | Loans Past Due 90 Days or More    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 8,456 5,849
Commercial real estate loans | Construction/land development | Total Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 8,805 13,264
Commercial real estate loans | Construction/land development | Current Loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 2,604,799 2,713,729
Commercial real estate loans | Agricultural    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 321,046 332,412
Accruing Loans Past Due 90 Days or More 0 0
Commercial real estate loans | Agricultural | Loans Past Due 30-59 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 130 99
Commercial real estate loans | Agricultural | Loans Past Due 60-89 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 776 0
Commercial real estate loans | Agricultural | Loans Past Due 90 Days or More    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 398 489
Commercial real estate loans | Agricultural | Total Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 1,304 588
Commercial real estate loans | Agricultural | Current Loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 319,742 331,824
Residential real estate loans | Residential 1-4 family    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 2,100,374 2,134,334
Accruing Loans Past Due 90 Days or More 136 2,321
Residential real estate loans | Residential 1-4 family | Loans Past Due 30-59 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 9,683 3,709
Residential real estate loans | Residential 1-4 family | Loans Past Due 60-89 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 2,434 4,650
Residential real estate loans | Residential 1-4 family | Loans Past Due 90 Days or More    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 25,026 26,470
Residential real estate loans | Residential 1-4 family | Total Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 37,143 34,829
Residential real estate loans | Residential 1-4 family | Current Loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 2,063,231 2,099,505
Residential real estate loans | Multifamily residential    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 1,232,639 1,140,911
Accruing Loans Past Due 90 Days or More 0 0
Residential real estate loans | Multifamily residential | Loans Past Due 30-59 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 0 0
Residential real estate loans | Multifamily residential | Loans Past Due 60-89 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 0 0
Residential real estate loans | Multifamily residential | Loans Past Due 90 Days or More    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 11,175 10,925
Residential real estate loans | Multifamily residential | Total Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 11,175 10,925
Residential real estate loans | Multifamily residential | Current Loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 1,221,464 1,129,986
Total real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 11,663,192 11,624,762
Accruing Loans Past Due 90 Days or More 1,487 2,726
Total real estate | Loans Past Due 30-59 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 11,239 41,463
Total real estate | Loans Past Due 60-89 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 3,702 16,581
Total real estate | Loans Past Due 90 Days or More    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 102,573 65,418
Total real estate | Total Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 117,514 123,462
Total real estate | Current Loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 11,545,678 11,501,300
Consumer    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 1,254,936 1,253,746
Accruing Loans Past Due 90 Days or More 0 3,290
Consumer | Loans Past Due 30-59 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 1,255 1,251
Consumer | Loans Past Due 60-89 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 475 210
Consumer | Loans Past Due 90 Days or More    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 12,393 13,616
Consumer | Total Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 14,123 15,077
Consumer | Current Loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 1,240,813 1,238,669
Commercial and industrial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 2,172,267 2,222,401
Accruing Loans Past Due 90 Days or More 982 964
Commercial and industrial | Loans Past Due 30-59 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 1,139 41,433
Commercial and industrial | Loans Past Due 60-89 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 1,400 1,048
Commercial and industrial | Loans Past Due 90 Days or More    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 65,923 4,724
Commercial and industrial | Total Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 68,462 47,205
Commercial and industrial | Current Loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 2,103,805 2,175,196
Agricultural & other    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 543,233 585,300
Accruing Loans Past Due 90 Days or More 12 0
Agricultural & other | Loans Past Due 30-59 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 841 1,267
Agricultural & other | Loans Past Due 60-89 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 80 14
Agricultural & other | Loans Past Due 90 Days or More    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 1,231 1,224
Agricultural & other | Total Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 2,152 2,505
Agricultural & other | Current Loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans $ 541,081 $ 582,795