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Derivatives (Fair Values of Derivative Financial Instruments) (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | $ 7,745,924,000 | $ 7,392,532,000 |
Fair Values, Assets |  | 49,736,000 | 71,893,000 |
Fair Values, Assets | [1] | 111,539,000 | 150,253,000 |
Less: netting adjustment | [1] | (43,383,000) | (76,413,000) | [2]
Total derivative assets/liabilities | [1] | 68,156,000 | 73,840,000 |
Fair Values, Liabilities |  | 42,453,000 | 54,707,000 |
Fair Values, Liabilities | [1] | 106,586,000 | 160,623,000 |
Less: netting adjustment | [1] | (4,000) |  |
Other Liabilities [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Total derivative assets/liabilities | [1] | 106,582,000 | 160,623,000 |
Derivatives Designated as Hedging Instruments [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 2,122,500,000 | 1,827,500,000 |
Fair Values, Assets | [1] | 27,683,000 | 39,647,000 |
Fair Values, Liabilities | [1] | 21,313,000 | 48,022,000 |
Derivatives Not Designated as Hedging Instruments [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 5,623,424,000 | 5,565,032,000 |
Fair Values, Assets | [1] | 83,856,000 | 110,606,000 |
Fair Values, Liabilities | [1] | 85,273,000 | 112,601,000 |
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 5,021,110,000 | 4,926,461,000 |
Fair Values, Assets | [1] | 78,218,000 | 108,702,000 |
Fair Values, Liabilities | [1] | 78,382,000 | 108,761,000 |
Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 368,598,000 | 445,554,000 |
Fair Values, Assets | [1] | 13,000 | 7,000 |
Fair Values, Liabilities | [1] | 8,000 | 9,000 |
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate-Lock Commitments on Residential Mortgage Loans [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 33,729,000 | 25,526,000 |
Fair Values, Assets | [1] | 648,000 |  |
Fair Values, Liabilities | [1] |  | 383,000 |
Derivatives Not Designated as Hedging Instruments [Member] | Forward Commitments to Sell Residential Mortgage Loans [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 11,311,000 | 27,465,000 |
Fair Values, Assets | [1] |  | 420,000 |
Fair Values, Liabilities | [1] | 132,000 | 0 |
Derivatives Not Designated as Hedging Instruments [Member] | To Be Announced (TBA) Securities [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 35,750,000 | 15,250,000 |
Fair Values, Assets | [1] | 92,000 | 88,000 |
Fair Values, Liabilities | [1] | 70,000 | 1,000 |
Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 111,184,000 | 82,756,000 |
Fair Values, Assets | [1] | 4,885,000 | 1,389,000 |
Fair Values, Liabilities | [1] | 4,826,000 | 1,358,000 |
Derivatives Not Designated as Hedging Instruments [Member] | Visa Class B derivative contract [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 41,742,000 | 42,020,000 |
Fair Values, Liabilities | [1] | 1,855,000 | 2,089,000 |
Cash Flow Hedge [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps - Variable Rate Loans [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 1,725,000,000 | 1,350,000,000 |
Fair Values, Assets | [1] | 4,655,000 |  |
Fair Values, Liabilities | [1] | 21,313,000 | 48,022,000 |
Fair Value Hedging [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps - Securities [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 397,500,000 | 477,500,000 |
Fair Values, Assets | [1] | $ 23,028,000 | $ 39,647,000 |
[1] | Derivative assets and liabilities are reported in other assets and other liabilities, respectively, in the consolidated balance sheets.
[2] | Represents balance sheet netting of derivative assets and liabilities for variation margin collateral held or placed with the same central clearing counterparty. See offsetting assets and liabilities for further information.

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