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Allowance for Credit Losses (Collateral Dependent Loans and Leases) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 37,642,413 | $ 37,441,951
Commercial real estate |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 19,631,173 | 19,454,480
Commercial real estate | Commercial Real Estate, Non-owner Occupied Term [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 6,557,768 | 6,482,940
Commercial real estate | Owner occupied term, net |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 5,231,676 | 5,195,605
Commercial |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 9,742,766 | 9,696,404
Commercial | Term, net |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 5,544,450 | 5,536,765
Commercial | Lines of credit & other, net |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,491,557 | 2,430,127
Commercial | Leases & equipment finance, net |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,706,759 | 1,729,512
Residential |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 8,079,305 | 8,095,332
Residential | Mortgage, net |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 6,128,884 | 6,157,166
Residential | Home equity loans & lines, net |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,950,421 | $ 1,938,166
Residential Real Estate |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 59,438 |
Residential Real Estate | Commercial real estate | Commercial Real Estate, Non-owner Occupied Term [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 |
Residential Real Estate | Commercial real estate | Owner occupied term, net |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 |
Residential Real Estate | Commercial | Term, net |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 |
Residential Real Estate | Commercial | Lines of credit & other, net |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 |
Residential Real Estate | Commercial | Leases & equipment finance, net |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 |
Residential Real Estate | Residential | Mortgage, net |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 56,920 |
Residential Real Estate | Residential | Home equity loans & lines, net |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,518 |
Commercial Real Estate |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 38,453 |
Commercial Real Estate | Commercial real estate | Commercial Real Estate, Non-owner Occupied Term [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 5,290 |
Commercial Real Estate | Commercial real estate | Owner occupied term, net |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 31,710 |
Commercial Real Estate | Commercial | Term, net |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 |
Commercial Real Estate | Commercial | Lines of credit & other, net |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,453 |
Commercial Real Estate | Commercial | Leases & equipment finance, net |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 |
Commercial Real Estate | Residential | Mortgage, net |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 |
Commercial Real Estate | Residential | Home equity loans & lines, net |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 |
General Business Assets |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 47,795 |
General Business Assets | Commercial real estate | Commercial Real Estate, Non-owner Occupied Term [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 |
General Business Assets | Commercial real estate | Owner occupied term, net |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 |
General Business Assets | Commercial | Term, net |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 16,952 |
General Business Assets | Commercial | Lines of credit & other, net |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 250 |
General Business Assets | Commercial | Leases & equipment finance, net |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 30,593 |
General Business Assets | Residential | Mortgage, net |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 |
General Business Assets | Residential | Home equity loans & lines, net |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 |
Other |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 4,265 |
Other | Commercial real estate | Commercial Real Estate, Non-owner Occupied Term [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 |
Other | Commercial real estate | Owner occupied term, net |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 |
Other | Commercial | Term, net |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 4,265 |
Other | Commercial | Lines of credit & other, net |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 |
Other | Commercial | Leases & equipment finance, net |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 |
Other | Residential | Mortgage, net |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 |
Other | Residential | Home equity loans & lines, net |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 |
Total |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 149,951 |
Total | Commercial real estate | Commercial Real Estate, Non-owner Occupied Term [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 5,290 |
Total | Commercial real estate | Owner occupied term, net |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 31,710 |
Total | Commercial | Term, net |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 21,217 |
Total | Commercial | Lines of credit & other, net |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,703 |
Total | Commercial | Leases & equipment finance, net |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 30,593 |
Total | Residential | Mortgage, net |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 56,920 |
Total | Residential | Home equity loans & lines, net |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 2,518 |

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