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Derivatives (Fair Values of Derivative Financial Instruments) (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2025 | Dec. 31, 2024
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | $ 7,474,521,000 | $ 7,392,532,000 |
Fair Values, Assets |  | 55,113,000 | 71,893,000 |
Fair Values, Assets | [1] | 121,090,000 | 150,253,000 |
Less: netting adjustment | [1] | (50,007,000) | (76,413,000) | [2]
Total derivative assets/liabilities | [1] | 71,083,000 | 73,840,000 |
Fair Values, Liabilities |  | 45,328,000 | 54,707,000 |
Fair Values, Liabilities | [1] | 118,519,000 | 160,623,000 |
Less: netting adjustment | [1] | (2,000) |  |
Other Liabilities [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Total derivative assets/liabilities | [1] | 118,517,000 | 160,623,000 |
Derivatives Designated as Hedging Instruments [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 2,102,500,000 | 1,827,500,000 |
Fair Values, Assets | [1] | 30,571,000 | 39,647,000 |
Fair Values, Liabilities | [1] | 26,809,000 | 48,022,000 |
Derivatives Not Designated as Hedging Instruments [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 5,372,021,000 | 5,565,032,000 |
Fair Values, Assets | [1] | 90,519,000 | 110,606,000 |
Fair Values, Liabilities | [1] | 91,710,000 | 112,601,000 |
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 4,732,198,000 | 4,926,461,000 |
Fair Values, Assets | [1] | 82,944,000 | 108,702,000 |
Fair Values, Liabilities | [1] | 83,132,000 | 108,761,000 |
Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 379,301,000 | 445,554,000 |
Fair Values, Assets | [1] | 14,000 | 7,000 |
Fair Values, Liabilities | [1] | 12,000 | 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 |  | 40,167,000 | 25,526,000 |
Fair Values, Assets | [1] | 1,026,000 |  |
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 |  | 14,957,000 | 27,465,000 |
Fair Values, Assets | [1] |  | 420,000 |
Fair Values, Liabilities | [1] | 269,000 | 0 |
Derivatives Not Designated as Hedging Instruments [Member] | To Be Announced (TBA) Securities [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 34,500,000 | 15,250,000 |
Fair Values, Assets | [1] | 2,000 | 88,000 |
Fair Values, Liabilities | [1] | 196,000 | 1,000 |
Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 128,996,000 | 82,756,000 |
Fair Values, Assets | [1] | 6,533,000 | 1,389,000 |
Fair Values, Liabilities | [1] | 6,480,000 | 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 |  | 41,902,000 | 42,020,000 |
Fair Values, Liabilities | [1] | 1,621,000 | 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 |  | 1,625,000,000 | 1,350,000,000 |
Fair Values, Assets | [1] | 4,041,000 |  |
Fair Values, Liabilities | [1] | 26,809,000 | 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 |  | 477,500,000 | 477,500,000 |
Fair Values, Assets | [1] | $ 26,530,000 | $ 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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