v3.26.3
Segment Reporting (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Jun. 30, 2026
Mar. 31, 2026
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2026
Sep. 30, 2025
Apr. 01, 2026
Dec. 31, 2025
Segment Income Statement Data Abstract                    
Interest Income (Expense), Operating $ 377,251     $ 305,222     $ 1,054,479 $ 891,163    
Noninterest Income 87,131     81,265     243,387 207,019    
Provision for Loan, Lease, and Other Losses 14,005     16,000     44,394 46,999    
Noninterest Expense 260,342     216,202     751,386 636,173    
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest, Total 190,035     154,286     502,086 415,010    
Income Tax Expense (Benefit) 43,449     29,554     112,301 77,362    
Net Income (Loss) Attributable to Parent, Total 146,586 $ 123,564 $ 119,635 124,732 $ 111,230 $ 101,687 389,785 337,648    
Goodwill 1,147,081           1,147,081   $ 42,100 $ 1,104,992
Interest Income (Expense), after Provision for Loan Loss 363,246     289,223     1,010,085 844,164    
Labor and Related Expense 153,714     135,703     450,054 386,593    
Information Technology and Data Processing 42,725     28,590     105,328 82,237    
Occupancy, Net 15,552     12,757     43,369 40,782    
Marketing and Advertising Expense 9,477     8,362     25,851 22,496    
Equipment Expense 5,480     4,368     16,514 13,389    
Professional Fees 9,053     5,232     33,228 17,989    
Federal Deposit Insurance Corporation Premium Expense 11,802     9,980     31,234 30,124    
Amortization of Intangible Assets 6,894     2,203     15,990 6,608    
Other Noninterest Expense 3,606     7,369     24,520 29,017    
Commercial and business lending 36,519,871           36,519,871     31,163,614
Assets 51,399,852           51,399,852     $ 45,202,596
Gain (Loss) on Sale of Mortgage Loans 0     0     0 (6,976)    
Corporate and Commercial Specialty [Member]                    
Segment Income Statement Data Abstract                    
A portion of total depreciation Technology expense 200     100     500 200    
Community, Consumer and Business [Member]                    
Segment Income Statement Data Abstract                    
A portion of total depreciation Occupancy expense 6,100     5,900     18,600 17,800    
Risk Management and Shared Services [Member]                    
Segment Income Statement Data Abstract                    
A portion of total depreciation Equipment expense 5,800     6,100     17,700 20,000    
Operating Segments                    
Segment Income Statement Data Abstract                    
Interest Income (Expense), Operating 377,251     305,222     1,054,479 891,163    
Net intersegment interest income (expense) 0     0     0 0    
Segment net interest income 377,251     305,222     1,054,479 891,163    
Noninterest Income 87,131     81,265     243,387 207,019    
Provision for Loan, Lease, and Other Losses 14,005     16,000     44,394 46,999    
Noninterest Expense 260,342     216,202     751,386 636,173    
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest, Total 190,035     154,286     502,086 415,010    
Income Tax Expense (Benefit) 43,449     29,554     112,301 77,362    
Net Income (Loss) Attributable to Parent, Total 146,586     124,732     389,785 337,648    
Goodwill 1,147,081     1,104,992     1,147,081 1,104,992    
Interest Income (Expense), before Provision 464,382     386,487     1,297,866 1,098,182    
Interest Income (Expense), after Provision for Loan Loss 450,377     370,487     1,253,472 1,051,183    
Labor and Related Expense 153,714     135,703     450,054 386,593    
Information Technology and Data Processing 42,725     28,590     105,328 82,237    
Occupancy, Net 15,552     12,757     43,369 40,782    
Marketing and Advertising Expense 9,477     8,362     25,851 22,496    
Equipment Expense 5,480     4,368     16,514 13,389    
Professional Fees 9,053     5,232     33,228 17,989    
Payments of Financing Costs 2,039     1,638     5,298 6,937    
Federal Deposit Insurance Corporation Premium Expense 11,802     9,980     31,234 30,124    
Amortization of Intangible Assets 6,894     2,203     15,990 6,608    
Other Noninterest Expense 3,606     7,369     24,520 29,017    
Allocated indirect expense 0     0     0 0    
Commercial and business lending 36,519,871     30,951,964     36,519,871 30,951,964    
Assets 51,399,852     44,455,863     51,399,852 44,455,863    
Operating Segments | Corporate and Commercial Specialty [Member]                    
Segment Income Statement Data Abstract                    
Interest Income (Expense), Operating 272,556     246,829     770,984 717,093    
Net intersegment interest income (expense) (111,503)     (107,596)     (325,347) (311,153)    
Segment net interest income 161,053     139,233     445,637 405,940    
Noninterest Income 22,174     17,882     51,714 42,770    
Provision for Loan, Lease, and Other Losses 19,776     20,424     61,723 59,806    
Noninterest Expense 57,874     57,032     166,004 169,187    
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest, Total 105,577     79,659     269,624 219,717    
Income Tax Expense (Benefit) 19,461     15,055     49,134 41,053    
Net Income (Loss) Attributable to Parent, Total 86,116     64,604     220,490 178,662    
Goodwill 556,343     525,836     556,343 525,836    
Interest Income (Expense), before Provision 183,227     157,115     497,351 448,710    
Interest Income (Expense), after Provision for Loan Loss 163,451     136,691     435,628 388,904    
Labor and Related Expense 25,535     21,287     73,680 62,763    
Information Technology and Data Processing 1,293     903     3,409 2,336    
Occupancy, Net 248     163     721 499    
Marketing and Advertising Expense 943     787     3,040 2,973    
Equipment Expense 6     6     18 18    
Professional Fees 358     337     887 759    
Payments of Financing Costs 156     111     876 1,182    
Federal Deposit Insurance Corporation Premium Expense 0     0     0 0    
Amortization of Intangible Assets 0     0     0 0    
Other Noninterest Expense 914     882     2,722 2,596    
Allocated indirect expense 28,421     32,556     80,651 96,061    
Commercial and business lending 21,954,404     18,033,065     21,954,404 18,033,065    
Assets 22,743,700     18,304,871     22,743,700 18,304,871    
Operating Segments | Community, Consumer and Business [Member]                    
Segment Income Statement Data Abstract                    
Interest Income (Expense), Operating 86,379     68,027     241,297 199,393    
Net intersegment interest income (expense) 158,683     146,139     432,201 434,995    
Segment net interest income 245,062     214,166     673,498 634,388    
Noninterest Income 56,318     53,670     168,698 154,230    
Provision for Loan, Lease, and Other Losses 6,695     6,437     20,086 18,871    
Noninterest Expense 176,174     159,170     506,658 466,985    
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest, Total 118,511     102,229     315,452 302,762    
Income Tax Expense (Benefit) 24,887     21,468     66,346 63,580    
Net Income (Loss) Attributable to Parent, Total 93,624     80,761     249,106 239,182    
Goodwill 590,738     579,156     590,738 579,156    
Interest Income (Expense), before Provision 301,380     267,836     842,196 788,618    
Interest Income (Expense), after Provision for Loan Loss 294,685     261,399     822,110 769,747    
Labor and Related Expense 70,103     62,334     200,513 178,847    
Information Technology and Data Processing 14,853     13,179     42,830 39,126    
Occupancy, Net 8,869     7,430     25,491 23,249    
Marketing and Advertising Expense 855     778     2,381 2,583    
Equipment Expense 2,374     2,186     6,762 6,517    
Professional Fees 1,320     585     3,484 1,928    
Payments of Financing Costs 1,866     979     4,095 3,495    
Federal Deposit Insurance Corporation Premium Expense 0     0     0 0    
Amortization of Intangible Assets 0     0     0 0    
Other Noninterest Expense 8,305     7,702     26,363 23,129    
Allocated indirect expense 67,629     63,997     194,739 188,111    
Commercial and business lending 14,173,208     12,481,836     14,173,208 12,481,836    
Assets 15,345,776     12,974,383     15,345,776 12,974,383    
Operating Segments | Risk Management and Shared Services [Member]                    
Segment Income Statement Data Abstract                    
Interest Income (Expense), Operating 18,316     (9,634)     42,198 (25,323)    
Net intersegment interest income (expense) (47,180)     (38,543)     (106,854) (123,842)    
Segment net interest income (28,864)     (48,177)     (64,656) (149,165)    
Noninterest Income 8,639     9,713     22,975 10,019    
Provision for Loan, Lease, and Other Losses (12,466)     (10,861)     (37,415) (31,678)    
Noninterest Expense 26,294     0     78,724 0    
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest, Total (34,053)     (27,603)     (82,990) (107,468)    
Income Tax Expense (Benefit) (899)     (6,969)     (3,179) (27,271)    
Net Income (Loss) Attributable to Parent, Total (33,154)     (20,634)     (79,811) (80,196)    
Goodwill 0     0     0 0    
Interest Income (Expense), before Provision (20,225)     (38,464)     (41,681) (139,146)    
Interest Income (Expense), after Provision for Loan Loss (7,759)     (27,603)     (4,266) (107,468)    
Labor and Related Expense 58,076     52,082     175,861 144,983    
Information Technology and Data Processing 26,579     14,508     59,089 40,775    
Occupancy, Net 6,435     5,164     17,157 17,034    
Marketing and Advertising Expense 7,679     6,797     20,430 16,940    
Equipment Expense 3,100     2,176     9,734 6,854    
Professional Fees 7,375     4,310     28,857 15,302    
Payments of Financing Costs 17     548     327 2,260    
Federal Deposit Insurance Corporation Premium Expense 11,802     9,980     31,234 30,124    
Amortization of Intangible Assets 6,894     2,203     15,990 6,608    
Other Noninterest Expense (5,613)     (1,215)     (4,565) 3,292    
Allocated indirect expense (96,050)     (96,553)     (275,390) (284,172)    
Commercial and business lending 392,259     437,063     392,259 437,063    
Assets $ 13,310,376     $ 13,176,609     $ 13,310,376 $ 13,176,609