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Derivatives (Fair Values of Derivative Financial Instruments) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | $ 7,680,572,000 | $ 7,691,719,000 |
Fair Values, Assets |  | $ 94,614,000 | $ 84,458,000 |
Derivative Asset, Statement of Financial Position [Extensible Enumeration] |  | Other Assets | Other Assets |
Fair Values, Assets | [1] | $ 174,564,000 | $ 156,360,000 |
Less: netting adjustment | [1] | (79,875,000) | (65,648,000) | [2]
Total derivative assets/liabilities | [1] | 94,689,000 | 90,712,000 |
Fair Values, Liabilities |  | 97,599,000 | 87,567,000 |
Fair Values, Liabilities | [1] | 235,380,000 | 207,138,000 |
Other Liabilities [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Total derivative assets/liabilities | [1] | 235,380,000 | 207,138,000 |
Derivatives Designated as Hedging Instruments [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 2,027,500,000 | 2,027,500,000 |
Fair Values, Assets | [1] | 31,347,000 | 22,819,000 |
Fair Values, Liabilities | [1] | 90,143,000 | 73,611,000 |
Derivatives Not Designated as Hedging Instruments [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 5,653,072,000 | 5,664,219,000 |
Fair Values, Assets | [1] | 143,217,000 | 133,541,000 |
Fair Values, Liabilities | [1] | 145,237,000 | 133,527,000 |
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 5,094,695,000 | 5,128,144,000 |
Fair Values, Assets | [1] | 141,396,000 | 131,271,000 |
Fair Values, Liabilities | [1] | 141,539,000 | 129,994,000 |
Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 348,091,000 | 364,906,000 |
Fair Values, Assets | [1] | 9,000 | 34,000 |
Fair Values, Liabilities | [1] | 4,000 | 18,000 |
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 |  | 39,373,000 | 13,355,000 |
Fair Values, Assets | [1] | 842,000 |  |
Fair Values, Liabilities | [1] | 1,000 | 286,000 |
Derivatives Not Designated as Hedging Instruments [Member] | Forward Commitments to Sell Residential Mortgage Loans [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 24,981,000 | 18,563,000 |
Fair Values, Assets | [1] |  | 372,000 |
Fair Values, Liabilities | [1] | 569,000 | 0 |
Derivatives Not Designated as Hedging Instruments [Member] | To Be Announced (TBA) Securities [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 20,250,000 | 13,500,000 |
Fair Values, Assets | [1] | 9,000 |  |
Fair Values, Liabilities | [1] | 46,000 | 47,000 |
Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 83,065,000 | 83,134,000 |
Fair Values, Assets | [1] | 961,000 | 1,864,000 |
Fair Values, Liabilities | [1] | 937,000 | 1,840,000 |
Derivatives Not Designated as Hedging Instruments [Member] | Visa Class B derivative contract [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Notional or Contractual Amount |  | 42,617,000 | 42,617,000 |
Fair Values, Liabilities | [1] | 2,141,000 | 1,342,000 |
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 |  | 1,550,000,000 | 1,550,000,000 |
Fair Values, Liabilities | [1] | $ 90,143,000 | $ 73,611,000 |
Fair Value Hedging [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps - Variable Rate Loans [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Statement of Financial Position [Extensible Enumeration] |  | Other Assets | Other Assets |
Derivative Liability, Statement of Financial Position [Extensible Enumeration] |  | Other Liabilities | Other Liabilities |
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] | $ 31,347,000 | $ 22,819,000 |
Derivative Asset, Statement of Financial Position [Extensible Enumeration] |  | Other Assets | Other Assets |
Derivative Liability, Statement of Financial Position [Extensible Enumeration] |  | Other Liabilities | Other Liabilities |
[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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