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Derivatives and Hedging Activities (Customer Related Derivative Positions - Not Designated as Hedges) (Details) $ in Thousands | Dec. 31, 2017 USD ($) position | Dec. 31, 2016 USD ($) position
--- | --- | ---
Summary of customer related derivative positions, not designated as hedging |  |  |
Total |  | $ 100,000 | $ 75,000
Fair Value |  | $ 1,616 | $ 624
Not Designated as Hedging Instrument [Member] | Receive fixed, pay variable | Loan level swaps |  |  |
Summary of customer related derivative positions, not designated as hedging |  |  |
Number of Positions (1) | position | [1] | 246 | 222
Less than 1 year |  | $ 36,023 | $ 30,245
Less than 2 years |  | 61,500 | 21,708
Less than 3 years |  | 152,287 | 63,771
Less than 4 years |  | 111,147 | 165,783
Thereafter |  | 591,385 | 567,897
Total |  | 952,342 | 849,404
Fair Value |  | $ 3,875 | $ 12,005
Not Designated as Hedging Instrument [Member] | Pay fixed, receive variable | Loan level swaps |  |  |
Summary of customer related derivative positions, not designated as hedging |  |  |
Number of Positions (1) | position | [1] | 231 | 207
Less than 1 year |  | $ 36,023 | $ 30,245
Less than 2 years |  | 61,500 | 21,708
Less than 3 years |  | 152,287 | 63,771
Less than 4 years |  | 111,147 | 165,783
Thereafter |  | 591,385 | 567,897
Total |  | 952,342 | 849,404
Fair Value |  | $ (3,880) | $ (12,008)
Not Designated as Hedging Instrument [Member] | Buys foreign currency, sells U.S. currency | Foreign exchange contracts |  |  |
Summary of customer related derivative positions, not designated as hedging |  |  |
Number of Positions (1) | position | [1] | 15 | 33
Less than 1 year |  | $ 26,382 | $ 45,711
Less than 2 years |  | 3,780 |
Total |  | 30,162 | 45,711
Fair Value |  | $ 1,202 | $ (2,250)
Not Designated as Hedging Instrument [Member] | Buys U.S. currency, sells foreign currency | Foreign exchange contracts |  |  |
Summary of customer related derivative positions, not designated as hedging |  |  |
Number of Positions (1) | position | [1] | 15 | 33
Less than 1 year |  | $ 26,382 | $ 45,711
Less than 2 years |  | 3,780 |
Total |  | 30,162 | 45,711
Fair Value |  | $ (1,188) | $ 2,277
[1] | The Company may enter into one dealer swap agreement which offsets multiple commercial borrower swap agreements.

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