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Derivatives and Hedging Activities (FV of Derivative Financial Instruments and Classification on Balance Sheet) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Fair value of derivative financial instruments as well as their classification on the balance sheet |  |
Total | $ 26,113 | $ 17,318
Total | 17,523 | 15,693
Other Assets [Member] |  |
Fair value of derivative financial instruments as well as their classification on the balance sheet |  |
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value | 17,355 | 15,596
Total | 26,310 | 17,476
Other Liabilities [Member] |  |
Fair value of derivative financial instruments as well as their classification on the balance sheet |  |
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value | 17,132 | 15,429
Total | 17,523 | 15,693
Interest rate derivatives | Derivatives designated as hedges: [Member] | Other Assets [Member] |  |
Fair value of derivative financial instruments as well as their classification on the balance sheet |  |
Interest Rate Derivative Assets, at Fair Value | 8,955 | 1,880
Interest rate derivatives | Derivatives designated as hedges: [Member] | Other Liabilities [Member] |  |
Fair value of derivative financial instruments as well as their classification on the balance sheet |  |
Interest rate derivatives | 391 | 264
Loan level swaps | Other Assets [Member] |  |
Fair value of derivative financial instruments as well as their classification on the balance sheet |  |
Total | 15,580 | 14,236
Loan level swaps | Other Liabilities [Member] |  |
Fair value of derivative financial instruments as well as their classification on the balance sheet |  |
Total | 15,584 | 14,241
Foreign exchange contracts | Other Assets [Member] |  |
Fair value of derivative financial instruments as well as their classification on the balance sheet |  |
Total | 1,578 | 1,202
Foreign exchange contracts | Other Liabilities [Member] |  |
Fair value of derivative financial instruments as well as their classification on the balance sheet |  |
Total | 1,548 | 1,188
Mortgage Derivatives | Derivatives not designated as hedges: [Member] | Other Assets [Member] |  |
Fair value of derivative financial instruments as well as their classification on the balance sheet |  |
Interest rate lock commitments | 91 | 149
Forward sales agreements | 106 | 9
Mortgage Derivatives | Derivatives not designated as hedges: [Member] | Other Liabilities [Member] |  |
Fair value of derivative financial instruments as well as their classification on the balance sheet |  |
Interest rate lock commitments | 0 | 0
Forward sales agreements | $ 0 | $ 0

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