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Derivatives (Fair Values of Derivative Financial Instruments) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | $ 8,040,346,000 | $ 7,392,532,000 |
Fair Values, Assets |  | 46,120,000 | 71,893,000 |
Fair Values, Assets | [1] | 105,612,000 | 150,253,000 |
Less: netting adjustments | [1],[2] | (42,486,000) | (76,413,000) |
Total derivative assets/liabilities | [1] | 63,126,000 | 73,840,000 |
Fair Values, Liabilities |  | 36,259,000 | 54,707,000 |
Fair Values, Liabilities | [1] | 95,373,000 | 160,623,000 |
Less: netting adjustments |  | (6,000) | 0 | [1],[2]
Other Liabilities [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Total derivative assets/liabilities | [1] | 95,367,000 | 160,623,000 |
Derivatives Designated as Hedging Instruments [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 2,172,500,000 | 1,827,500,000 |
Fair Values, Assets | [1] | 27,595,000 | 39,647,000 |
Fair Values, Liabilities | [1] | 16,335,000 | 48,022,000 |
Derivatives Not Designated as Hedging Instruments [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 5,867,846,000 | 5,565,032,000 |
Fair Values, Assets | [1] | 78,017,000 | 110,606,000 |
Fair Values, Liabilities | [1] | 79,038,000 | 112,601,000 |
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 5,308,711,000 | 4,926,461,000 |
Fair Values, Assets | [1] | 73,725,000 | 108,702,000 |
Fair Values, Liabilities | [1] | 73,829,000 | 108,761,000 |
Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 373,117,000 | 445,554,000 |
Fair Values, Assets | [1] | 10,000 | 7,000 |
Fair Values, Liabilities | [1] | 10,000 | 9,000 |
Derivatives Not Designated as Hedging Instruments [Member] | Forward Commitments to Sell Residential Mortgage Loans [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 9,081,000 | 25,526,000 |
Fair Values, Assets | [1] | 2,000 |  |
Fair Values, Liabilities | [1] | 108,000 | 383,000 |
Derivatives Not Designated as Hedging Instruments [Member] | To Be Announced (TBA) Securities [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 30,000,000 | 15,250,000 |
Fair Values, Assets | [1] | 4,000 | 88,000 |
Fair Values, Liabilities | [1] | 62,000 | 1,000 |
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 |  | 23,192,000 | 27,465,000 |
Fair Values, Assets | [1] | 497,000 | 420,000 |
Fair Values, Liabilities | [1] |  | 0 |
Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 82,157,000 | 82,756,000 |
Fair Values, Assets | [1] | 3,779,000 | 1,389,000 |
Fair Values, Liabilities | [1] | 3,745,000 | 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 |  | 41,588,000 | 42,020,000 |
Fair Values, Liabilities | [1] | 1,284,000 | 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 |  | 1,775,000,000 | 1,350,000,000 |
Fair Values, Assets | [1] | 4,026,000 |  |
Fair Values, Liabilities | [1] | 16,335,000 | 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] | $ 23,569,000 | $ 39,647,000 |
[1] | Derivative assets and liabilities are reported in other assets or 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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