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Loans Past Due Status (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | $ 30,607,605 | $ 30,607,605 | $ 29,768,586
Financing Receivable, Nonaccrual | 112,999 | 112,999 | 123,260
Nonaccrual Loans, Current Portion | $ 33,300 | $ 33,300 | $ 52,400
Percent of current nonaccrual loans | 29.00% | 29.00% | 42.00%
Financing Receivable, Nonaccrual, Interest Income | $ 0 | $ 0 | $ 0
Financing Receivable, Nonaccrual, No Allowance | 21,400 | 21,400 | 23,800
Commercial and Industrial Sector |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 11,281,964 | 11,281,964 | 10,573,741
Financing Receivable, Nonaccrual | 6,945 | 6,945 | 19,084
Commercial Real Estate Owner Occupied Portfolio [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 1,101,501 | 1,101,501 | 1,143,741
Financing Receivable, Nonaccrual | 0 | 0 | 1,501
Commercial And Business Lending [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 12,383,465 | 12,383,465 | 11,717,483
Financing Receivable, Nonaccrual | 6,945 | 6,945 | 20,585
Commercial Real Estate Investor Portfolio Segment [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 5,370,422 | 5,370,422 | 5,227,975
Financing Receivable, Nonaccrual | 15,805 | 15,805 | 16,705
Construction Loans [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 1,950,267 | 1,950,267 | 1,982,632
Financing Receivable, Nonaccrual | 146 | 146 | 30
Commercial Real Estate Portfolio Segment [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 7,320,689 | 7,320,689 | 7,210,607
Financing Receivable, Nonaccrual | 15,950 | 15,950 | 16,735
Commercial Portfolio Segment [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 19,704,154 | 19,704,154 | 18,928,090
Financing Receivable, Nonaccrual | 22,895 | 22,895 | 37,320
Residential Mortgage [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 6,949,387 | 6,949,387 | 7,047,541
Financing Receivable, Nonaccrual | 73,817 | 73,817 | 70,038
Automobile Loan [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 2,969,495 | 2,969,495 | 2,810,220
Financing Receivable, Nonaccrual | 8,004 | 8,004 | 7,402
Home Equity Line of Credit [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 676,208 | 676,208 | 664,252
Financing Receivable, Nonaccrual | 8,201 | 8,201 | 8,378
Other Consumer [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 308,361 | 308,361 | 318,483
Financing Receivable, Nonaccrual | 82 | 82 | 122
Consumer Loan [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 10,903,451 | 10,903,451 | 10,840,496
Financing Receivable, Nonaccrual | 90,104 | 90,104 | 85,941
Financial Asset, Not Past Due [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 30,442,282 | 30,442,282 | 29,565,335
Financial Asset, Not Past Due [Member] | Commercial and Industrial Sector |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 11,271,869 | 11,271,869 | 10,552,756
Financial Asset, Not Past Due [Member] | Commercial Real Estate Owner Occupied Portfolio [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 1,095,873 | 1,095,873 | 1,140,607
Financial Asset, Not Past Due [Member] | Commercial And Business Lending [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 12,367,742 | 12,367,742 | 11,693,363
Financial Asset, Not Past Due [Member] | Commercial Real Estate Investor Portfolio Segment [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 5,342,011 | 5,342,011 | 5,174,879
Financial Asset, Not Past Due [Member] | Construction Loans [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 1,950,031 | 1,950,031 | 1,982,581
Financial Asset, Not Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 7,292,042 | 7,292,042 | 7,157,460
Financial Asset, Not Past Due [Member] | Commercial Portfolio Segment [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 19,659,784 | 19,659,784 | 18,850,823
Financial Asset, Not Past Due [Member] | Residential Mortgage [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 6,866,825 | 6,866,825 | 6,962,610
Financial Asset, Not Past Due [Member] | Automobile Loan [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 2,948,341 | 2,948,341 | 2,787,967
Financial Asset, Not Past Due [Member] | Home Equity Line of Credit [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 663,668 | 663,668 | 651,248
Financial Asset, Not Past Due [Member] | Other Consumer [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 303,664 | 303,664 | 312,687
Financial Asset, Not Past Due [Member] | Consumer Loan [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 10,782,499 | 10,782,499 | 10,714,512
Financial Asset, 30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 31,561 | 31,561 | 40,961
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial and Industrial Sector |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 555 | 555 | 899
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate Owner Occupied Portfolio [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 5,258 | 5,258 | 1,533
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial And Business Lending [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 5,813 | 5,813 | 2,432
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate Investor Portfolio Segment [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 587 | 587 | 5,117
Financial Asset, 30 to 59 Days Past Due [Member] | Construction Loans [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 90 | 90 | 21
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 677 | 677 | 5,138
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 6,490 | 6,490 | 7,570
Financial Asset, 30 to 59 Days Past Due [Member] | Residential Mortgage [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 8,710 | 8,710 | 14,731
Financial Asset, 30 to 59 Days Past Due [Member] | Automobile Loan [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 11,142 | 11,142 | 12,588
Financial Asset, 30 to 59 Days Past Due [Member] | Home Equity Line of Credit [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 3,629 | 3,629 | 4,181
Financial Asset, 30 to 59 Days Past Due [Member] | Other Consumer [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 1,591 | 1,591 | 1,892
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Loan [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 25,072 | 25,072 | 33,391
Financial Asset, 60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 6,602 | 6,602 | 35,841
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial and Industrial Sector |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 2,039 | 2,039 | 361
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate Owner Occupied Portfolio [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 370 | 370 | 101
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial And Business Lending [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 2,409 | 2,409 | 462
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate Investor Portfolio Segment [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 455 | 455 | 31,274
Financial Asset, 60 to 89 Days Past Due [Member] | Construction Loans [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 0 | 0 | 0
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 455 | 455 | 31,274
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 2,864 | 2,864 | 31,736
Financial Asset, 60 to 89 Days Past Due [Member] | Residential Mortgage [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 34 | 34 | 162
Financial Asset, 60 to 89 Days Past Due [Member] | Automobile Loan [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 2,007 | 2,007 | 2,262
Financial Asset, 60 to 89 Days Past Due [Member] | Home Equity Line of Credit [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 709 | 709 | 445
Financial Asset, 60 to 89 Days Past Due [Member] | Other Consumer [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 987 | 987 | 1,236
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Loan [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 3,738 | 3,738 | 4,105
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 14,160 | 14,160 | 3,189
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial and Industrial Sector |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 558 | 558 | 642
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate Owner Occupied Portfolio [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 0 | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial And Business Lending [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 558 | 558 | 642
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate Investor Portfolio Segment [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 11,565 | 11,565 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction Loans [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 0 | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 11,565 | 11,565 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 12,123 | 12,123 | 642
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential Mortgage [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 0 | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Automobile Loan [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 0 | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Home Equity Line of Credit [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 0 | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Other Consumer [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 2,038 | 2,038 | 2,547
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Loan [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | $ 2,038 | $ 2,038 | $ 2,547

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