Derivatives and Hedging Activities (Customer Related Derivative Positions - Not Designated as Hedges) (Details) $ in Thousands	Mar. 31, 2017 USD ($) position	Dec. 31, 2016 USD ($) position
Summary of customer related derivative positions, not designated as hedging
Total	$ 75,000	$ 75,000
Fair Value	$ 836	$ 624
Not Designated as Hedging Instrument | Receive fixed, pay variable | Loan level swaps
Summary of customer related derivative positions, not designated as hedging
Number of Positions | position	226	222
Less than 1 year	$ 31,782	$ 30,245
Less than 2 years	19,558	21,708
Less than 3 years	106,647	63,771
Less than 4 years	188,536	165,783
Thereafter	519,949	567,897
Total	866,472	849,404
Fair Value	$ 8,608	$ 12,005
Not Designated as Hedging Instrument | Pay fixed, receive variable | Loan level swaps
Summary of customer related derivative positions, not designated as hedging
Number of Positions | position	211	207
Less than 1 year	$ 31,782	$ 30,245
Less than 2 years	19,558	21,708
Less than 3 years	106,647	63,771
Less than 4 years	188,536	165,783
Thereafter	519,949	567,897
Total	866,472	849,404
Fair Value	$ (8,617)	$ (12,008)
Not Designated as Hedging Instrument | Buys foreign currency, sells U.S. currency | Foreign exchange contracts
Summary of customer related derivative positions, not designated as hedging
Number of Positions | position	22	33
Less than 1 year	$ 52,619	$ 45,711
Total	52,619	45,711
Fair Value	$ (1,432)	$ (2,250)
Not Designated as Hedging Instrument | Buys U.S. currency, sells foreign currency | Foreign exchange contracts
Summary of customer related derivative positions, not designated as hedging
Number of Positions | position	22	33
Less than 1 year	$ 52,619	$ 45,711
Total	52,619	45,711
Fair Value	$ 1,452	$ 2,277