Derivatives and Hedging Activities (Customer Related Derivative Positions - Not Designated as Hedges) (Details) $ in Thousands	Sep. 30, 2015 USD ($) position	Dec. 31, 2014 USD ($) position
Summary of customer related derivative positions, not designated as hedging
Total	$ 75,000	$ 75,000
Derivative Asset, Fair Value, Gross Asset	29,867	22,390
Fair Value	(4,355)	(5,570)
Loan level swaps
Summary of customer related derivative positions, not designated as hedging
Derivative Asset, Fair Value, Gross Asset	29,205	18,383
Foreign exchange contracts
Summary of customer related derivative positions, not designated as hedging
Derivative Asset, Fair Value, Gross Asset	$ 662	$ 4,007
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	176	174
Less than 1 year	$ 63,287	$ 88,147
Less than 2 years	19,527	46,854
Less than 3 years	42,008	40,958
Less than 4 years	92,501	38,108
Thereafter	435,087	403,208
Total	652,410	617,275
Fair Value	$ 29,205	$ 17,840
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	170	168
Less than 1 year	$ 63,287	$ 88,147
Less than 2 years	19,527	46,854
Less than 3 years	42,008	40,958
Less than 4 years	92,501	38,108
Thereafter	435,087	403,208
Total	652,410	617,275
Fair Value	$ (29,202)	$ (17,837)
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	29	23
Less than 1 year	$ 35,732	$ 57,112
Total	35,732	57,112
Fair Value	$ 332	$ 3,983
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	29	23
Less than 1 year	$ 35,732	$ 57,112
Total	35,732	57,112
Fair Value	$ (304)	$ (3,960)