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Derivatives and Hedging Activities (FV of Derivative Financial Instruments and Classification on Balance Sheet) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | $ 104,450 | $ 26,113
Liability Derivatives | 75,093 | 17,523
Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value | 77,050 | 17,355
Derivative Asset, Fair Value, Gross Asset | 106,601 | 26,310
Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value | 74,890 | 17,132
Liability Derivatives | 75,134 | 17,523
Interest rate swaps [Member] | Derivatives designated as hedges [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Interest Rate Derivative Assets, at Fair Value | 29,551 | 8,955
Interest rate swaps [Member] | Derivatives designated as hedges [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Interest Rate Derivative Liabilities, at Fair Value | 244 | 391
Loan level swaps [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 71,554 | 15,580
Loan level swaps [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives | 71,544 | 15,584
Foreign exchange contracts | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 3,345 | 1,578
Foreign exchange contracts | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives | 3,305 | 1,548
Interest Rate Lock Commitments [Member] | Not Designated as Hedging Instrument | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Instrument Not Designated as a Hedge, Interest Rate Lock Commitments, Asset at Fair Value | 2,133 | 91
Derivative Instrument Not Designated as a Hedge, Forward Sales Agreements, Asset at Fair Value | 0 | 106
Derivative Instrument Not Designated as a Hedge, Forward Sale Hedge Commitment, Asset at Fair Value | 18 | 0
Interest Rate Lock Commitments [Member] | Not Designated as Hedging Instrument | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Instrument Not Designated as a Hedge, Interest Rate Lock Commitments, Liabilities at Fair Value | 0 | 0
Derivative Instrument Not Designated as a Hedge, Forward Sales Agreements, Liabilities at Fair Value | 41 | 0
Derivative Instrument Not Designated as a Hedge, Forward Sale Hedge Commitment, Liability at Fair Value | $ 0 | $ 0

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