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Derivatives (Fair Values of Derivative Financial Instruments) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Derivatives Fair Value [Line Items] |  |  |
Notional or Contractual Amount |  | $ 3,989,850 | $ 3,024,565
Fair Values, Assets |  | 24 | 3,325
Less: netting adjustment, Assets | [1],[2] | (31,598) | (11,979)
Fair Values, Liabilities |  | 14,620 | 2,160
Less: netting adjustment, Liabilities | [1],[2] | (65,088) | (22,588)
Other Assets [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Assets | [1] | 103,502 | 28,959
Total derivative assets/liabilities | [1] | 71,904 | 16,980
Other Liabilities [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Total derivative assets/liabilities | [1] | 23,467 | 22,227
Fair Values, Liabilities | [1] | 88,555 | 44,815
Derivatives Designated as Hedging Instruments [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Notional or Contractual Amount |  | 1,679,510 | 1,358,110
Derivatives Designated as Hedging Instruments [Member] | Other Assets [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Assets | [1] | 31,453 | 3,954
Derivatives Designated as Hedging Instruments [Member] | Other Liabilities [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Liabilities | [1] | 7,952 | 11,262
Derivatives Not Designated as Hedging Instruments [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Notional or Contractual Amount |  | 2,310,340 | 1,666,455
Derivatives Not Designated as Hedging Instruments [Member] | Other Assets [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Assets | [1] | 72,049 | 25,005
Derivatives Not Designated as Hedging Instruments [Member] | Other Liabilities [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Liabilities | [1] | 80,603 | 33,553
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Notional or Contractual Amount | [3] | 1,726,248 | 1,277,404
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Assets [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Assets | [1],[3] | 70,701 | 23,670
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Liabilities [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Liabilities | [1],[3] | 72,804 | 24,669
Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Notional or Contractual Amount |  | 237,081 | 171,222
Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member] | Other Assets [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Assets | [1] | 38 | 10
Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member] | Other Liabilities [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Liabilities | [1] | 60 | 131
Derivatives Not Designated as Hedging Instruments [Member] | Forward Commitments to Sell Residential Mortgage Loans [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Notional or Contractual Amount |  | 151,413 | 77,208
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] | 335 | 110
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] | 649 | 664
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 |  | 78,769 | 59,119
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] | 240 | 464
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] | 149 | 67
Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Notional or Contractual Amount |  | 73,076 | 37,749
Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member] | Other Assets [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Assets | [1] | 735 | 751
Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member] | Other Liabilities [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Fair Values, Liabilities | [1] | 692 | 718
Derivatives Not Designated as Hedging Instruments [Member] | Visa Class B derivative contract [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Notional or Contractual Amount |  | 43,753 | 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] | 6,249 | 7,304
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 |  | 1,075,000 | 875,000
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] | 31,453 | 3,954
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] |  | 9,173
Fair Value Hedging [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps - Securities [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Notional or Contractual Amount |  | 441,400 |
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] | 7,872 |
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 |  | 163,110 | 483,110
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] | $ 80 | $ 2,089
[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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