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Derivatives (Fair Values of Derivative Financial Instruments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Derivatives Fair Value [Line Items] |  |  |
Notional or Contractual Amount |  | $ 8,684,485 | $ 8,649,657
Fair Values, Assets |  | 45,281 | 6,908
Less: netting adjustment | [1],[2] | (88,275) | (30,304)
Fair Values, Liabilities |  | 3,796 | 22,244
Less: netting adjustment | [1],[2] | (45,705) | (61,534)
Other Assets [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Assets | [1] | 147,933 | 106,171
Total derivative assets/liabilities | [1] | 59,658 | 75,867
Other Liabilities [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Total derivative assets/liabilities | [1] | 78,257 | 35,046
Fair Values, Liabilities | [1] | 123,962 | 96,580
Derivatives Designated as Hedging Instruments [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Notional or Contractual Amount |  | 3,019,650 | 2,962,650
Derivatives Designated as Hedging Instruments [Member] | Other Assets [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Assets | [1] | 62,029 | 28,022
Derivatives Designated as Hedging Instruments [Member] | Other Liabilities [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Liabilities | [1] | 36,930 | 15,111
Derivatives Not Designated as Hedging Instruments [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Notional or Contractual Amount |  | 5,664,835 | 5,687,007
Derivatives Not Designated as Hedging Instruments [Member] | Other Assets [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Assets | [1] | 85,904 | 78,149
Derivatives Not Designated as Hedging Instruments [Member] | Other Liabilities [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Liabilities | [1] | 87,032 | 81,469
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Notional or Contractual Amount |  | 5,188,151 | 5,193,991
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Assets [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Assets | [1] | 84,071 | 75,819
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Liabilities [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Liabilities | [1] | 82,835 | 75,861
Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Notional or Contractual Amount |  | 235,301 | 217,437
Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member] | Other Assets [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Assets | [1] | 5 | 11
Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member] | Other Liabilities [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Liabilities | [1] | 16 | 35
Derivatives Not Designated as Hedging Instruments [Member] | Forward Commitments to Sell Residential Mortgage Loans [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Notional or Contractual Amount |  | 31,306 | 46,739
Derivatives Not Designated as Hedging Instruments [Member] | Forward Commitments to Sell Residential Mortgage Loans [Member] | Other Assets [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Assets | [1] | 55 | 1
Derivatives Not Designated as Hedging Instruments [Member] | Forward Commitments to Sell Residential Mortgage Loans [Member] | Other Liabilities [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Liabilities | [1] | 168 | 645
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 |  | 66,675 | 82,037
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate-Lock Commitments on Residential Mortgage Loans [Member] | Other Assets [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Assets | [1] | 585 | 1,525
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate-Lock Commitments on Residential Mortgage Loans [Member] | Other Liabilities [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Liabilities | [1] | 132 | 1
Derivatives Not Designated as Hedging Instruments [Member] | To Be Announced (TBA) Securities [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Notional or Contractual Amount |  | 42,750 | 55,000
Derivatives Not Designated as Hedging Instruments [Member] | To Be Announced (TBA) Securities [Member] | Other Assets [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Assets | [1] | 736 | 15
Derivatives Not Designated as Hedging Instruments [Member] | To Be Announced (TBA) Securities [Member] | Other Liabilities [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Liabilities | [1] | 7 | 53
Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Notional or Contractual Amount |  | 57,213 | 48,364
Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member] | Other Assets [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Assets | [1] | 452 | 778
Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member] | Other Liabilities [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Liabilities | [1] | 358 | 758
Derivatives Not Designated as Hedging Instruments [Member] | Visa Class B derivative contract [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Notional or Contractual Amount |  | 43,439 | 43,439
Derivatives Not Designated as Hedging Instruments [Member] | Visa Class B derivative contract [Member] | Other Liabilities [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Liabilities | [1] | 3,516 | 4,116
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 |  | 1,325,000 | 1,125,000
Cash Flow Hedge [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps - Variable Rate Loans [Member] | Other Assets [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Assets | [1] | 1,336 | 5,884
Cash Flow Hedge [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps - Variable Rate Loans [Member] | Other Liabilities [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Liabilities | [1] | 36,930 | 4,421
Cash Flow Hedge [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Notional or Contractual Amount |  | 100,000 |
Fair Value Hedging [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps - Securities [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Notional or Contractual Amount |  | 1,694,650 | 1,837,650
Fair Value Hedging [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps - Securities [Member] | Other Assets [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Assets | [1] | $ 60,693 | 22,138
Fair Value Hedging [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps - Securities [Member] | Other Liabilities [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Liabilities | [1] |  | $ 10,690
[1] | Derivative assets and liabilities are reported at fair value 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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