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Derivatives (Fair Values of Derivative Financial Instruments) (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2026 | Dec. 31, 2025 | Mar. 31, 2025
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | $ 8,315,062,000 | $ 8,040,346,000 |
Fair Values, Assets |  | 44,299,000 | 46,120,000 |
Fair Values, Assets | [1] | 98,257,000 | 105,612,000 |
Less: netting adjustment | [1],[2] | (42,574,000) | (42,486,000) |
Total derivative assets/liabilities | [1] | 55,683,000 | 63,126,000 |
Fair Values, Liabilities |  | 31,619,000 | 36,259,000 |
Fair Values, Liabilities | [1] | 91,143,000 | 95,373,000 |
Less: netting adjustment | [1],[2] |  | (6,000) |
Other Liabilities [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Total derivative assets/liabilities | [1] | 91,143,000 | 95,367,000 |
Derivatives Designated as Hedging Instruments [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 2,159,000,000 | 2,172,500,000 |
Fair Values, Assets | [1] | 25,302,000 | 27,595,000 |
Fair Values, Liabilities | [1] | 17,922,000 | 16,335,000 |
Derivatives Not Designated as Hedging Instruments [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 6,156,062,000 | 5,867,846,000 |
Fair Values, Assets | [1] | 72,955,000 | 78,017,000 |
Fair Values, Liabilities | [1] | 73,221,000 | 79,038,000 |
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 5,492,800,000 | 5,308,711,000 |
Fair Values, Assets | [1] | 69,195,000 | 73,725,000 |
Fair Values, Liabilities | [1] | 69,323,000 | 73,829,000 |
Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 431,843,000 | 373,117,000 |
Fair Values, Assets | [1] | 22,000 | 10,000 |
Fair Values, Liabilities | [1] | 26,000 | 10,000 |
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 |  | 48,849,000 | 23,192,000 |
Fair Values, Assets | [1] | 714,000 | 497,000 |
Fair Values, Liabilities | [1] | 23,000 |  |
Derivatives Not Designated as Hedging Instruments [Member] | Forward Commitments to Sell Residential Mortgage Loans [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 19,418,000 | 9,081,000 |
Fair Values, Assets | [1] | 46,000 | 2,000 |
Fair Values, Liabilities | [1] | 161,000 | 108,000 |
Derivatives Not Designated as Hedging Instruments [Member] | To Be Announced (TBA) Securities [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 38,750,000 | 30,000,000 |
Fair Values, Assets | [1] | 372,000 | 4,000 |
Fair Values, Liabilities | [1] | 28,000 | 62,000 |
Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 82,858,000 | 82,157,000 |
Fair Values, Assets | [1] | 2,606,000 | 3,779,000 |
Fair Values, Liabilities | [1] | 2,578,000 | 3,745,000 |
Derivatives Not Designated as Hedging Instruments [Member] | Visa Class B derivative contract [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 41,544,000 | 41,588,000 |
Fair Values, Liabilities | [1] | 1,082,000 | 1,284,000 |
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 |  | 1,800,000,000 | 1,775,000,000 |
Fair Values, Assets | [1] | 1,985,000 | 4,026,000 |
Fair Values, Liabilities | [1] | 17,922,000 | 16,335,000 |
Fair Value Hedging [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 265,000,000 |  | $ 125,000,000
Fair Value Hedging [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps - Securities [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 359,000,000 | 397,500,000 |
Fair Values, Assets | [1] | $ 23,317,000 | $ 23,569,000 |
[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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