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Derivatives and Hedging Activities (FV of Derivative Financial Instruments and Classification on Balance Sheet) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Fair value of derivative financial instruments as well as their classification on the balance sheet |  |
Total | $ 17,318 | $ 22,331
Total | 15,693 | 21,683
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 | 15,596 | 21,397
Total | 17,476 | 22,761
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 | 15,429 | 21,176
Total | 15,693 | 21,916
Interest rate derivatives |  |
Fair value of derivative financial instruments as well as their classification on the balance sheet |  |
Total |  | 740
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 | 1,880 | 1,364
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 | 264 | 740
Loan level swaps |  |
Fair value of derivative financial instruments as well as their classification on the balance sheet |  |
Total |  | 18,629
Total |  | 18,632
Loan level swaps | Other Assets [Member] |  |
Fair value of derivative financial instruments as well as their classification on the balance sheet |  |
Total | 14,236 | 18,629
Loan level swaps | Other Liabilities [Member] |  |
Fair value of derivative financial instruments as well as their classification on the balance sheet |  |
Total | 14,241 | 18,632
Foreign exchange contracts |  |
Fair value of derivative financial instruments as well as their classification on the balance sheet |  |
Total |  | 2,338
Total |  | 2,311
Foreign exchange contracts | Other Assets [Member] |  |
Fair value of derivative financial instruments as well as their classification on the balance sheet |  |
Total | 1,202 | 2,338
Foreign exchange contracts | Other Liabilities [Member] |  |
Fair value of derivative financial instruments as well as their classification on the balance sheet |  |
Total | 1,188 | 2,311
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 | 149 | 430
Forward sales agreements | 9 | 0
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 | $ 233

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