Derivatives and Hedging Activities (Customer Related Derivative Positions - Not Designated as Hedges) (Details)	Jun. 30, 2015 USD ($) position	Dec. 31, 2014 USD ($) position
Summary of customer related derivative positions, not designated as hedging
Total	$ 75,000,000	$ 75,000,000
Derivative Asset, Fair Value, Gross Asset	18,448,000	22,390,000
Fair Value	(4,636,000)	(5,570,000)
Loan level swaps
Summary of customer related derivative positions, not designated as hedging
Derivative Asset, Fair Value, Gross Asset	17,636,000	18,383,000
Foreign exchange contracts
Summary of customer related derivative positions, not designated as hedging
Derivative Asset, Fair Value, Gross Asset	$ 812,000	$ 4,007,000
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	177	174
Less than 1 year	$ 71,534,000	$ 88,147,000
Less than 2 years	43,250,000	46,854,000
Less than 3 years	40,474,000	40,958,000
Less than 4 years	74,605,000	38,108,000
Thereafter	426,106,000	403,208,000
Total	655,969,000	617,275,000
Fair Value	$ 17,507,000	$ 17,840,000
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	171	168
Less than 1 year	$ 71,534,000	$ 88,147,000
Less than 2 years	43,250,000	46,854,000
Less than 3 years	40,474,000	40,958,000
Less than 4 years	74,605,000	38,108,000
Thereafter	426,106,000	403,208,000
Total	655,969,000	617,275,000
Fair Value	$ (17,538,000)	$ (17,837,000)
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	16	23
Less than 1 year	$ 24,099,000	$ 57,112,000
Total	24,099,000	57,112,000
Fair Value	$ 812,000	$ 4,007,000
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	16	23
Less than 1 year	$ 24,099,000	$ 57,112,000
Total	24,099,000	57,112,000
Fair Value	$ (789,000)	$ (3,984,000)