v3.26.1
Allowance for Credit Losses - Schedule of Aging of the Company's Loan Portfolio (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Financing Receivable, Past Due [Line Items]      
Nonaccrual $ 166,916 $ 166,651 $ 151,203
Total loans, net of unearned income 54,071,292 53,105,101 48,708,390
Early buy-out loans guaranteed by U.S. government agencies      
Financing Receivable, Past Due [Line Items]      
Nonaccrual 0 0 0
Total loans, net of unearned income 145,225 145,793 123,742
Commercial      
Financing Receivable, Past Due [Line Items]      
Nonaccrual 87,750 78,059 70,560
Total loans, net of unearned income 17,763,221 17,044,686 15,931,326
Commercial real estate      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 14,162,286 13,940,736 12,914,901
Commercial real estate | Construction and development      
Financing Receivable, Past Due [Line Items]      
Nonaccrual 860 2,976 3,613
Total loans, net of unearned income 2,323,942 2,409,582 2,448,881
Commercial real estate | Non-construction      
Financing Receivable, Past Due [Line Items]      
Nonaccrual 15,897 22,171 22,574
Total loans, net of unearned income 11,838,344 11,531,154 10,466,020
Home equity      
Financing Receivable, Past Due [Line Items]      
Nonaccrual 1,142 1,221 2,070
Total loans, net of unearned income 471,264 480,525 455,683
Residential real estate, excluding early buy-out loans      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 4,465,166 4,317,232 3,685,159
Residential real estate, excluding early buy-out loans | Residential real estate, excluding early buy-out loans      
Financing Receivable, Past Due [Line Items]      
Nonaccrual 27,360 32,862 22,522
Total loans, net of unearned income 4,319,941 4,171,439 3,561,417
Premium finance receivables—property & casualty | Premium finance receivables—property & casualty      
Financing Receivable, Past Due [Line Items]      
Nonaccrual 33,891 29,354 29,846
Total loans, net of unearned income 7,890,331 8,183,416 7,239,862
Premium finance receivables—property & casualty | Premium finance receivables—life insurance      
Financing Receivable, Past Due [Line Items]      
Nonaccrual 0 0 0
Total loans, net of unearned income 9,196,382 9,023,642 8,365,140
Consumer and other      
Financing Receivable, Past Due [Line Items]      
Nonaccrual 16 8 18
Total loans, net of unearned income 122,642 114,864 116,319
Total loans, net of unearned income, excluding early buy-out loans      
Financing Receivable, Past Due [Line Items]      
Nonaccrual 166,916 166,651 151,203
Total loans, net of unearned income 53,926,067 52,959,308 48,584,648
90+ days and still accruing      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 71,511 73,005 51,647
90+ days and still accruing | Early buy-out loans guaranteed by U.S. government agencies      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 55,678 53,848 30,460
90+ days and still accruing | Commercial      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 0 0 46
90+ days and still accruing | Commercial real estate | Construction and development      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 0 0 0
90+ days and still accruing | Commercial real estate | Non-construction      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 0 0 0
90+ days and still accruing | Home equity      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 0 0 0
90+ days and still accruing | Residential real estate, excluding early buy-out loans | Residential real estate, excluding early buy-out loans      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 0 0 0
90+ days and still accruing | Premium finance receivables—property & casualty | Premium finance receivables—property & casualty      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 15,823 19,115 18,081
90+ days and still accruing | Premium finance receivables—property & casualty | Premium finance receivables—life insurance      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 0 0 2,962
90+ days and still accruing | Consumer and other      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 10 42 98
90+ days and still accruing | Total loans, net of unearned income, excluding early buy-out loans      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 15,833 19,157 21,187
60-89 days past due      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 66,729 95,006 56,496
60-89 days past due | Early buy-out loans guaranteed by U.S. government agencies      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 0 204 1,457
60-89 days past due | Commercial      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 9,996 22,952 15,243
60-89 days past due | Commercial real estate | Construction and development      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 0 1,260 820
60-89 days past due | Commercial real estate | Non-construction      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 17,133 18,269 6,175
60-89 days past due | Home equity      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 463 1,112 984
60-89 days past due | Residential real estate, excluding early buy-out loans | Residential real estate, excluding early buy-out loans      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 129 7,562 1,351
60-89 days past due | Premium finance receivables—property & casualty | Premium finance receivables—property & casualty      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 16,188 29,294 19,717
60-89 days past due | Premium finance receivables—property & casualty | Premium finance receivables—life insurance      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 22,690 13,887 10,587
60-89 days past due | Consumer and other      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 130 466 162
60-89 days past due | Total loans, net of unearned income, excluding early buy-out loans      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 66,729 94,802 55,039
30-59 days past due      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 284,734 265,982 295,446
30-59 days past due | Early buy-out loans guaranteed by U.S. government agencies      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 410 1,316 2,125
30-59 days past due | Commercial      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 90,389 90,205 97,397
30-59 days past due | Commercial real estate | Construction and development      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 7,607 13,456 3,994
30-59 days past due | Commercial real estate | Non-construction      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 46,536 52,145 79,659
30-59 days past due | Home equity      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 2,012 2,818 3,403
30-59 days past due | Residential real estate, excluding early buy-out loans | Residential real estate, excluding early buy-out loans      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 30,854 24,908 38,943
30-59 days past due | Premium finance receivables—property & casualty | Premium finance receivables—property & casualty      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 47,936 57,685 39,459
30-59 days past due | Premium finance receivables—property & casualty | Premium finance receivables—life insurance      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 58,760 22,806 29,924
30-59 days past due | Consumer and other      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 230 643 542
30-59 days past due | Total loans, net of unearned income, excluding early buy-out loans      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 284,324 264,666 293,321
Current      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 53,481,402 52,504,457 48,153,598
Current | Early buy-out loans guaranteed by U.S. government agencies      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 89,137 90,425 89,700
Current | Commercial      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 17,575,086 16,853,470 15,748,080
Current | Commercial real estate | Construction and development      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 2,315,475 2,391,890 2,440,454
Current | Commercial real estate | Non-construction      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 11,758,778 11,438,569 10,357,612
Current | Home equity      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 467,647 475,374 449,226
Current | Residential real estate, excluding early buy-out loans | Residential real estate, excluding early buy-out loans      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 4,261,598 4,106,107 3,498,601
Current | Premium finance receivables—property & casualty | Premium finance receivables—property & casualty      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 7,776,493 8,047,968 7,132,759
Current | Premium finance receivables—property & casualty | Premium finance receivables—life insurance      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 9,114,932 8,986,949 8,321,667
Current | Consumer and other      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 122,256 113,705 115,499
Current | Total loans, net of unearned income, excluding early buy-out loans      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income $ 53,392,265 $ 52,414,032 $ 48,063,898