v3.26.3
Allowance for Credit Losses - Schedule of Aging of the Company's Loan Portfolio (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Sep. 30, 2025
Financing Receivable, Past Due [Line Items]      
Non-accrual $ 149,418 $ 166,651 $ 149,566
Total loans, net of unearned income 56,804,571 53,105,101 52,063,482
Early buy-out loans guaranteed by U.S. government agencies      
Financing Receivable, Past Due [Line Items]      
Non-accrual 0 0 0
Total loans, net of unearned income 143,138 145,793 124,824
Commercial      
Financing Receivable, Past Due [Line Items]      
Non-accrual 85,670 78,059 66,577
Total loans, net of unearned income 18,341,765 17,044,686 16,544,342
Commercial Real Estate      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 14,960,611 13,940,736 13,619,207
Commercial Real Estate | Construction and development      
Financing Receivable, Past Due [Line Items]      
Non-accrual 834 2,976 3,227
Total loans, net of unearned income 2,678,889 2,409,582 2,658,153
Commercial Real Estate | Non-construction      
Financing Receivable, Past Due [Line Items]      
Non-accrual 12,179 22,171 24,975
Total loans, net of unearned income 12,281,722 11,531,154 10,961,054
Home equity      
Financing Receivable, Past Due [Line Items]      
Non-accrual 1,149 1,221 1,295
Total loans, net of unearned income 507,831 480,525 484,202
Residential real estate, excluding early buy-out loans      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 4,696,015 4,317,232 4,143,870
Residential real estate, excluding early buy-out loans | Residential real estate, excluding early buy-out loans      
Financing Receivable, Past Due [Line Items]      
Non-accrual 26,218 32,862 28,942
Total loans, net of unearned income 4,552,877 4,171,439 4,019,046
Premium finance receivables—property & casualty | Premium finance receivables—property & casualty      
Financing Receivable, Past Due [Line Items]      
Non-accrual 23,341 29,354 24,512
Total loans, net of unearned income 8,624,322 8,183,416 8,366,292
Premium finance receivables—property & casualty | Premium finance receivables—life insurance      
Financing Receivable, Past Due [Line Items]      
Non-accrual 0 0 0
Total loans, net of unearned income 9,538,863 9,023,642 8,758,553
Consumer and other      
Financing Receivable, Past Due [Line Items]      
Non-accrual 27 8 38
Total loans, net of unearned income 135,164 114,864 147,016
Total loans, net of unearned income, excluding early buy-out loans      
Financing Receivable, Past Due [Line Items]      
Non-accrual 149,418 166,651 149,566
Total loans, net of unearned income 56,661,433 52,959,308 51,938,658
90+ days and still accruing      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 81,894 73,005 60,440
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 54,408 53,848 47,374
90+ days and still accruing | Commercial      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 0 0 0
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 17,093 19,115 13,006
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 10,380 0 0
90+ days and still accruing | Consumer and other      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 13 42 60
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 27,486 19,157 13,066
60-89 days past due      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 65,943 95,006 92,976
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 0
60-89 days past due | Commercial      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 21,825 22,952 12,190
60-89 days past due | Commercial Real Estate | Construction and development      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 8,333 1,260 630
60-89 days past due | Commercial Real Estate | Non-construction      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 9,494 18,269 13,489
60-89 days past due | Home equity      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 1,085 1,112 246
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 5,390 7,562 8,829
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 19,238 29,294 23,527
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 536 13,887 34,016
60-89 days past due | Consumer and other      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 42 466 49
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 65,943 94,802 92,976
30-59 days past due      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 152,741 265,982 194,378
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 0 1,316 0
30-59 days past due | Commercial      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 39,132 90,205 36,136
30-59 days past due | Commercial Real Estate | Construction and development      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 14,278 13,456 40,276
30-59 days past due | Commercial Real Estate | Non-construction      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 60,267 52,145 42,779
30-59 days past due | Home equity      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 1,427 2,818 2,294
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 114 24,908 95
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 33,757 57,685 38,133
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 3,515 22,806 34,506
30-59 days past due | Consumer and other      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 251 643 159
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 152,741 264,666 194,378
Current      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 56,354,575 52,504,457 51,566,122
Current | Early buy-out loans guaranteed by U.S. government agencies      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 88,730 90,425 77,450
Current | Commercial      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 18,195,138 16,853,470 16,429,439
Current | Commercial Real Estate | Construction and development      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 2,655,444 2,391,890 2,614,020
Current | Commercial Real Estate | Non-construction      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 12,199,782 11,438,569 10,879,811
Current | Home equity      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 504,170 475,374 480,367
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 4,521,155 4,106,107 3,981,180
Current | Premium finance receivables—property & casualty | Premium finance receivables—property & casualty      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 8,530,893 8,047,968 8,267,114
Current | Premium finance receivables—property & casualty | Premium finance receivables—life insurance      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 9,524,432 8,986,949 8,690,031
Current | Consumer and other      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 134,831 113,705 146,710
Current | Total loans, net of unearned income, excluding early buy-out loans      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income $ 56,265,845 $ 52,414,032 $ 51,488,672