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Allowance for Credit Losses - Schedule of Loan Portfolio by Credit Quality Indicator (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 $ 16,277,029 $ 16,277,029  
2024 6,277,803 6,277,803  
2023 4,528,302 4,528,302  
2022 5,194,936 5,194,936  
2021 3,998,677 3,998,677  
Prior 10,290,569 10,290,569  
Revolving 6,475,231 6,475,231  
Revolving to Term 62,554 62,554  
Total Loans 53,105,101 53,105,101 $ 48,055,037
Gross write offs      
2025 8,981 17,690  
2024 1,616 16,913  
2023 1,711 6,957  
2022 2,311 10,440  
2021 5,954 20,147  
Prior 6,503 19,719  
Revolving 0 0  
Revolving to Term 0 0  
Total loans 27,076 91,866 109,346
Commercial, industrial and other      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 3,764,112 3,764,112  
2024 2,754,423 2,754,423  
2023 1,671,238 1,671,238  
2022 1,121,554 1,121,554  
2021 832,529 832,529  
Prior 1,128,059 1,128,059  
Revolving 5,725,106 5,725,106  
Revolving to Term 47,665 47,665  
Total Loans 17,044,686 17,044,686  
Construction and development      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 360,765 360,765  
2024 603,682 603,682  
2023 584,590 584,590  
2022 676,884 676,884  
2021 28,674 28,674  
Prior 136,243 136,243  
Revolving 17,920 17,920  
Revolving to Term 824 824  
Total Loans 2,409,582 2,409,582  
Non-construction      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 2,281,185 2,281,185  
2024 1,361,507 1,361,507  
2023 1,303,447 1,303,447  
2022 1,853,236 1,853,236  
2021 1,321,507 1,321,507  
Prior 3,202,490 3,202,490  
Revolving 205,835 205,835  
Revolving to Term 1,947 1,947  
Total Loans 11,531,154 11,531,154  
Home equity      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 0 0  
2024 283 283  
2023 312 312  
2022 570 570  
2021 497 497  
Prior 19,386 19,386  
Revolving 447,359 447,359  
Revolving to Term 12,118 12,118  
Total Loans 480,525 480,525 445,028
Gross write offs      
Total loans   138 74
Residential real estate      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 1,119,990 1,119,990  
2024 740,945 740,945  
2023 417,666 417,666  
2022 773,943 773,943  
2021 722,899 722,899  
Prior 541,789 541,789  
Revolving 0 0  
Revolving to Term 0 0  
Total Loans 4,317,232 4,317,232 3,612,765
Gross write offs      
Total loans   26 175
Premium finance receivables - property & casualty      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 8,152,581 8,152,581  
2024 27,955 27,955  
2023 1,630 1,630  
2022 562 562  
2021 688 688  
Prior 0 0  
Revolving 0 0  
Revolving to Term 0 0  
Total Loans 8,183,416 8,183,416  
Premium finance receivables - life      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 592,387 592,387  
2024 786,884 786,884  
2023 547,682 547,682  
2022 767,847 767,847  
2021 1,091,295 1,091,295  
Prior 5,237,547 5,237,547  
Revolving 0 0  
Revolving to Term 0 0  
Total Loans 9,023,642 9,023,642  
Consumer and other      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 6,009 6,009  
2024 2,124 2,124  
2023 1,737 1,737  
2022 340 340  
2021 588 588  
Prior 25,055 25,055  
Revolving 79,011 79,011  
Revolving to Term 0 0  
Total Loans 114,864 114,864 99,562
Gross write offs      
Total loans   703 $ 587
Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 16,089,361 16,089,361  
2024 6,176,109 6,176,109  
2023 4,279,367 4,279,367  
2022 4,842,398 4,842,398  
2021 3,863,216 3,863,216  
Prior 9,980,708 9,980,708  
Revolving 6,291,716 6,291,716  
Revolving to Term 58,189 58,189  
Total Loans 51,581,064 51,581,064  
Pass | Commercial, industrial and other      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 3,720,058 3,720,058  
2024 2,692,642 2,692,642  
2023 1,604,743 1,604,743  
2022 1,059,564 1,059,564  
2021 775,585 775,585  
Prior 1,086,890 1,086,890  
Revolving 5,557,016 5,557,016  
Revolving to Term 43,490 43,490  
Total Loans 16,539,988 16,539,988  
Pass | Construction and development      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 360,765 360,765  
2024 603,682 603,682  
2023 520,694 520,694  
2022 524,644 524,644  
2021 28,674 28,674  
Prior 104,220 104,220  
Revolving 13,947 13,947  
Revolving to Term 824 824  
Total Loans 2,157,450 2,157,450  
Pass | Non-construction      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 2,279,126 2,279,126  
2024 1,341,928 1,341,928  
2023 1,207,171 1,207,171  
2022 1,741,249 1,741,249  
2021 1,261,008 1,261,008  
Prior 3,104,804 3,104,804  
Revolving 202,614 202,614  
Revolving to Term 1,947 1,947  
Total Loans 11,139,847 11,139,847  
Pass | Home equity      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 0 0  
2024 223 223  
2023 197 197  
2022 144 144  
2021 277 277  
Prior 13,241 13,241  
Revolving 439,150 439,150  
Revolving to Term 11,928 11,928  
Total Loans 465,160 465,160  
Pass | Residential real estate      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 1,118,444 1,118,444  
2024 726,637 726,637  
2023 395,578 395,578  
2022 748,133 748,133  
2021 705,103 705,103  
Prior 409,071 409,071  
Revolving 0 0  
Revolving to Term 0 0  
Total Loans 4,102,966 4,102,966  
Pass | Premium finance receivables - property & casualty      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 8,012,676 8,012,676  
2024 22,018 22,018  
2023 1,595 1,595  
2022 559 559  
2021 686 686  
Prior 0 0  
Revolving 0 0  
Revolving to Term 0 0  
Total Loans 8,037,534 8,037,534  
Pass | Premium finance receivables - life      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 592,387 592,387  
2024 786,884 786,884  
2023 547,682 547,682  
2022 767,847 767,847  
2021 1,091,295 1,091,295  
Prior 5,237,547 5,237,547  
Revolving 0 0  
Revolving to Term 0 0  
Total Loans 9,023,642 9,023,642  
Pass | Consumer and other      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 5,905 5,905  
2024 2,095 2,095  
2023 1,707 1,707  
2022 258 258  
2021 588 588  
Prior 24,935 24,935  
Revolving 78,989 78,989  
Revolving to Term 0 0  
Total Loans 114,477 114,477  
Special mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 136,496 136,496  
2024 35,604 35,604  
2023 152,870 152,870  
2022 206,892 206,892  
2021 20,184 20,184  
Prior 105,923 105,923  
Revolving 128,281 128,281  
Revolving to Term 922 922  
Total Loans 787,172 787,172  
Special mention | Commercial, industrial and other      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 31,571 31,571  
2024 31,629 31,629  
2023 34,593 34,593  
2022 12,766 12,766  
2021 11,067 11,067  
Prior 34,746 34,746  
Revolving 120,913 120,913  
Revolving to Term 767 767  
Total Loans 278,052 278,052  
Special mention | Construction and development      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 0 0  
2024 0 0  
2023 49,398 49,398  
2022 131,923 131,923  
2021 0 0  
Prior 15,736 15,736  
Revolving 0 0  
Revolving to Term 0 0  
Total Loans 197,057 197,057  
Special mention | Non-construction      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 2,059 2,059  
2024 841 841  
2023 62,563 62,563  
2022 56,882 56,882  
2021 6,109 6,109  
Prior 45,720 45,720  
Revolving 1,414 1,414  
Revolving to Term 0 0  
Total Loans 175,588 175,588  
Special mention | Home equity      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 0 0  
2024 60 60  
2023 100 100  
2022 219 219  
2021 0 0  
Prior 2,190 2,190  
Revolving 5,941 5,941  
Revolving to Term 155 155  
Total Loans 8,665 8,665  
Special mention | Residential real estate      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 506 506  
2024 2,020 2,020  
2023 6,167 6,167  
2022 5,020 5,020  
2021 3,008 3,008  
Prior 7,423 7,423  
Revolving 0 0  
Revolving to Term 0 0  
Total Loans 24,144 24,144  
Special mention | Premium finance receivables - property & casualty      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 102,258 102,258  
2024 1,039 1,039  
2023 19 19  
2022 0 0  
2021 0 0  
Prior 0 0  
Revolving 0 0  
Revolving to Term 0 0  
Total Loans 103,316 103,316  
Special mention | Premium finance receivables - life      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 0 0  
2024 0 0  
2023 0 0  
2022 0 0  
2021 0 0  
Prior 0 0  
Revolving 0 0  
Revolving to Term 0 0  
Total Loans 0 0  
Special mention | Consumer and other      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 102 102  
2024 15 15  
2023 30 30  
2022 82 82  
2021 0 0  
Prior 108 108  
Revolving 13 13  
Revolving to Term 0 0  
Total Loans 350 350  
Substandard accrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 20,318 20,318  
2024 42,795 42,795  
2023 69,524 69,524  
2022 98,706 98,706  
2021 77,927 77,927  
Prior 60,202 60,202  
Revolving 53,140 53,140  
Revolving to Term 1,809 1,809  
Total Loans 424,421 424,421  
Substandard accrual | Commercial, industrial and other      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 7,477 7,477  
2024 23,517 23,517  
2023 25,706 25,706  
2022 21,069 21,069  
2021 20,639 20,639  
Prior 3,322 3,322  
Revolving 45,083 45,083  
Revolving to Term 1,774 1,774  
Total Loans 148,587 148,587  
Substandard accrual | Construction and development      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 0 0  
2024 0 0  
2023 13,748 13,748  
2022 18,996 18,996  
2021 0 0  
Prior 15,382 15,382  
Revolving 3,973 3,973  
Revolving to Term 0 0  
Total Loans 52,099 52,099  
Substandard accrual | Non-construction      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 0 0  
2024 18,738 18,738  
2023 29,242 29,242  
2022 54,800 54,800  
2021 54,390 54,390  
Prior 34,571 34,571  
Revolving 1,807 1,807  
Revolving to Term 0 0  
Total Loans 193,548 193,548  
Substandard accrual | Home equity      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 0 0  
2024 0 0  
2023 15 15  
2022 19 19  
2021 91 91  
Prior 3,051 3,051  
Revolving 2,268 2,268  
Revolving to Term 35 35  
Total Loans 5,479 5,479  
Substandard accrual | Residential real estate      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 28 28  
2024 135 135  
2023 813 813  
2022 3,821 3,821  
2021 2,806 2,806  
Prior 3,864 3,864  
Revolving 0 0  
Revolving to Term 0 0  
Total Loans 11,467 11,467  
Substandard accrual | Premium finance receivables - property & casualty      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 12,811 12,811  
2024 399 399  
2023 0 0  
2022 1 1  
2021 1 1  
Prior 0 0  
Revolving 0 0  
Revolving to Term 0 0  
Total Loans 13,212 13,212  
Substandard accrual | Premium finance receivables - life      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 0 0  
2024 0 0  
2023 0 0  
2022 0 0  
2021 0 0  
Prior 0 0  
Revolving 0 0  
Revolving to Term 0 0  
Total Loans 0 0  
Substandard accrual | Consumer and other      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 2 2  
2024 6 6  
2023 0 0  
2022 0 0  
2021 0 0  
Prior 12 12  
Revolving 9 9  
Revolving to Term 0 0  
Total Loans 29 29  
Substandard nonaccrual/doubtful      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 30,108 30,108  
2024 14,880 14,880  
2023 17,454 17,454  
2022 39,472 39,472  
2021 31,100 31,100  
Prior 29,909 29,909  
Revolving 2,094 2,094  
Revolving to Term 1,634 1,634  
Total Loans 166,651 166,651  
Substandard nonaccrual/doubtful | Commercial, industrial and other      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 5,006 5,006  
2024 6,635 6,635  
2023 6,196 6,196  
2022 28,155 28,155  
2021 25,238 25,238  
Prior 3,101 3,101  
Revolving 2,094 2,094  
Revolving to Term 1,634 1,634  
Total Loans 78,059 78,059  
Substandard nonaccrual/doubtful | Construction and development      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 0 0  
2024 0 0  
2023 750 750  
2022 1,321 1,321  
2021 0 0  
Prior 905 905  
Revolving 0 0  
Revolving to Term 0 0  
Total Loans 2,976 2,976  
Substandard nonaccrual/doubtful | Non-construction      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 0 0  
2024 0 0  
2023 4,471 4,471  
2022 305 305  
2021 0 0  
Prior 17,395 17,395  
Revolving 0 0  
Revolving to Term 0 0  
Total Loans 22,171 22,171  
Substandard nonaccrual/doubtful | Home equity      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 0 0  
2024 0 0  
2023 0 0  
2022 188 188  
2021 129 129  
Prior 904 904  
Revolving 0 0  
Revolving to Term 0 0  
Total Loans 1,221 1,221  
Substandard nonaccrual/doubtful | Residential real estate      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 266 266  
2024 3,738 3,738  
2023 6,021 6,021  
2022 9,501 9,501  
2021 5,732 5,732  
Prior 7,604 7,604  
Revolving 0 0  
Revolving to Term 0 0  
Total Loans 32,862 32,862  
Substandard nonaccrual/doubtful | Premium finance receivables - property & casualty      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 24,836 24,836  
2024 4,499 4,499  
2023 16 16  
2022 2 2  
2021 1 1  
Prior 0 0  
Revolving 0 0  
Revolving to Term 0 0  
Total Loans 29,354 29,354  
Substandard nonaccrual/doubtful | Premium finance receivables - life      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 0 0  
2024 0 0  
2023 0 0  
2022 0 0  
2021 0 0  
Prior 0 0  
Revolving 0 0  
Revolving to Term 0 0  
Total Loans 0 0  
Substandard nonaccrual/doubtful | Consumer and other      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 0 0  
2024 8 8  
2023 0 0  
2022 0 0  
2021 0 0  
Prior 0 0  
Revolving 0 0  
Revolving to Term 0 0  
Total Loans 8 8  
Early buy-out loans guaranteed by U.S. government agencies      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 746 746  
2024 8,415 8,415  
2023 9,087 9,087  
2022 7,468 7,468  
2021 6,250 6,250  
Prior 113,827 113,827  
Revolving 0 0  
Revolving to Term 0 0  
Total Loans 145,793 145,793  
Early buy-out loans guaranteed by U.S. government agencies | Residential real estate      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 746 746  
2024 8,415 8,415  
2023 9,087 9,087  
2022 7,468 7,468  
2021 6,250 6,250  
Prior 113,827 113,827  
Revolving 0 0  
Revolving to Term 0 0  
Total Loans $ 145,793 $ 145,793