Derivatives and Hedging Activities (Customer Related Derivative Positions - Not Designated as Hedges) (Details) $ in Thousands	Mar. 31, 2016 USD ($) position	Dec. 31, 2015 USD ($) position
Summary of customer related derivative positions, not designated as hedging
Total	$ 75,000	$ 75,000
Derivative Asset, Fair Value, Gross Asset	40,702	23,072
Fair Value	(3,007)	(3,273)
Loan level swaps
Summary of customer related derivative positions, not designated as hedging
Derivative Asset, Fair Value, Gross Asset	38,787	22,470
Foreign exchange contracts
Summary of customer related derivative positions, not designated as hedging
Derivative Asset, Fair Value, Gross Asset	$ 1,915	$ 602
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	188	171
Less than 1 year	$ 33,566	$ 37,732
Less than 2 years	34,167	34,424
Less than 3 years	24,760	29,629
Less than 4 years	118,742	77,041
Thereafter	494,821	488,110
Total	706,056	666,936
Fair Value	$ 38,787	$ 22,467
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	173	165
Less than 1 year	$ 33,566	$ 37,732
Less than 2 years	34,167	34,424
Less than 3 years	24,760	29,629
Less than 4 years	118,742	77,041
Thereafter	494,821	488,110
Total	706,056	666,936
Fair Value	$ (38,737)	$ (22,462)
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	33	21
Less than 1 year	$ 60,214	$ 38,416
Total	60,214	38,416
Fair Value	$ 1,845	$ (354)
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	33	21
Less than 1 year	$ 60,214	$ 38,416
Total	60,214	38,416
Fair Value	$ (1,806)	$ 382