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Derivatives (Fair Values of Derivative Financial Instruments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Derivatives Fair Value [Line Items] |  |  |
Notional or Contractual Amount |  | $ 6,822,497 | $ 6,010,689
Fair Values, Assets |  | 4 | 23
Less: netting adjustment, Assets | [1],[2] | (63,742) | (27,056)
Fair Values, Liabilities |  | 38,311 | 11,953
Less: netting adjustment, Liabilities | [1],[2] | (149,835) | (43,914)
Other Assets [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Assets | [1] | 230,611 | 81,502
Total derivative assets/liabilities | [1] | 166,869 | 54,446
Other Liabilities [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Total derivative assets/liabilities | [1] | 49,409 | 21,089
Fair Values, Liabilities | [1] | 199,244 | 65,003
Derivatives Designated as Hedging Instruments [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Notional or Contractual Amount |  | 1,654,900 | 1,659,400
Derivatives Designated as Hedging Instruments [Member] | Other Assets [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Assets | [1] | 63,742 | 25,646
Derivatives Designated as Hedging Instruments [Member] | Other Liabilities [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Liabilities | [1] | 23,453 | 2,105
Derivatives Not Designated as Hedging Instruments [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Notional or Contractual Amount |  | 5,167,597 | 4,351,289
Derivatives Not Designated as Hedging Instruments [Member] | Other Assets [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Assets | [1] | 166,869 | 55,856
Derivatives Not Designated as Hedging Instruments [Member] | Other Liabilities [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Liabilities | [1] | 175,791 | 62,898
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Notional or Contractual Amount | [3] | 4,284,812 | 3,759,232
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Assets [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Assets | [1],[3] | 161,835 | 54,512
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Liabilities [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Liabilities | [1],[3] | 165,934 | 55,664
Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Notional or Contractual Amount |  | 248,423 | 254,825
Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member] | Other Assets [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Assets | [1] | 72 | 21
Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member] | Other Liabilities [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Liabilities | [1] | 82 | 45
Derivatives Not Designated as Hedging Instruments [Member] | Forward Commitments to Sell Residential Mortgage Loans [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Notional or Contractual Amount |  | 278,632 | 145,623
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] | 3,224 | 651
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] | 404 | 744
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 |  | 229,364 | 83,224
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] | 319 | 369
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] | 2,659 | 375
Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Notional or Contractual Amount |  | 83,094 | 64,632
Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member] | Other Assets [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Assets | [1] | 1,419 | 303
Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member] | Other Liabilities [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Liabilities | [1] | 1,367 | 366
Derivatives Not Designated as Hedging Instruments [Member] | Visa Class B derivative contract [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Notional or Contractual Amount |  | 43,272 | 43,753
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] | 5,345 | 5,704
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 |  | 1,175,000 | 1,175,000
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] | 63,742 | 24,172
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] |  | 337
Fair Value Hedging [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps - Securities [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Notional or Contractual Amount |  | 479,900 | 441,400
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] |  | 1,474
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] | $ 23,453 | 1,759
Fair Value Hedging [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps - Brokered Deposits [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Notional or Contractual Amount |  |  | 43,000
Fair Value Hedging [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps - Brokered Deposits [Member] | Other Liabilities [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Liabilities | [1] |  | $ 9
[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.
[3] | The notional amount represents both the customer accommodation agreements and offsetting agreements with unrelated financial institutions

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