Derivatives and Hedging Activities (Customer Related Derivative Positions - Not Designated as Hedges) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Summary of customer related derivative positions, not designated as hedging
Total	$ 75,000,000	$ 150,000,000
Fair Value	(5,570,000)	(9,630,000)
Not Designated as Hedging Instrument [Member] | Receive fixed, pay variable | Loan level derivatives
Summary of customer related derivative positions, not designated as hedging
Number of Positions (1)	174	168
Less than 1 year	88,147,000	48,882,000
Less than 2 years	46,854,000	97,975,000
Less than 3 years	40,958,000	42,957,000
Less than 4 years	38,108,000	42,116,000
Thereafter	403,208,000	329,554,000
Total	617,275,000	561,484,000
Fair Value	17,840,000	9,484,000
Not Designated as Hedging Instrument [Member] | Pay fixed, receive variable | Loan level derivatives
Summary of customer related derivative positions, not designated as hedging
Number of Positions (1)	168	162
Less than 1 year	88,147,000	48,882,000
Less than 2 years	46,854,000	97,975,000
Less than 3 years	40,958,000	42,957,000
Less than 4 years	38,108,000	42,116,000
Thereafter	403,208,000	329,554,000
Total	617,275,000	561,484,000
Fair Value	(17,837,000)	(9,523,000)
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)	23	6
Less than 1 year	57,112,000	11,367,000
Total	57,112,000	11,367,000
Fair Value	4,007,000	396,000
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)	23	6
Less than 1 year	57,112,000	11,367,000
Total	57,112,000	11,367,000
Fair Value	$ (3,984,000)	$ (390,000)