Derivatives and Hedging Activities (Customer Related Derivative Positions - Not Designated as Hedges) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Summary of customer related derivative positions, not designated as hedging
Fair Value	$ (8,720)		$ (9,630)
Receive fixed, pay variable [Member] | Loan level swaps [Member] | Notional Amount Maturing [Member]
Summary of customer related derivative positions, not designated as hedging
Number of Positions	172	[1]	168	[1]
Less than 1 year	54,500		48,882
Less than 2 years	93,550		97,975
Less than 3 years	44,183		42,957
Less than 4 years	42,593		42,116
Thereafter	356,467		329,554
Total	591,293		561,484
Fair Value	11,802		9,484
Pay fixed, receive variable [Member] | Loan level swaps [Member] | Notional Amount Maturing [Member]
Summary of customer related derivative positions, not designated as hedging
Number of Positions	166	[1]	162	[1]
Less than 1 year	54,500		48,882
Less than 2 years	93,550		97,975
Less than 3 years	44,183		42,957
Less than 4 years	42,593		42,116
Thereafter	356,467		329,554
Total	591,293		561,484
Fair Value	(11,823)		(9,523)
Buys foreign exchange, sells US currency [Member] | Foreign exchange contracts [Member] | Notional Amount Maturing [Member]
Summary of customer related derivative positions, not designated as hedging
Number of Positions	12	[1]	6	[1]
Less than 1 year	35,584		11,367
Less than 2 years
Less than 3 years
Less than 4 years
Thereafter
Total	35,584		11,367
Fair Value			396
Buys US currency, sells foreign exchange [Member] | Foreign exchange contracts [Member] | Notional Amount Maturing [Member]
Summary of customer related derivative positions, not designated as hedging
Number of Positions	12	[1]	6	[1]
Less than 1 year	35,584		11,367
Less than 2 years
Less than 3 years
Less than 4 years
Thereafter
Total	35,584		11,367
Fair Value			(390)
Other Assets [Member] | Not Designated as Hedging Instrument [Member] | Buys foreign exchange, sells US currency [Member] | Foreign exchange contracts [Member] | Notional Amount Maturing [Member]
Summary of customer related derivative positions, not designated as hedging
Fair Value	479
Other Liabilities [Member] | Not Designated as Hedging Instrument [Member] | Buys US currency, sells foreign exchange [Member] | Foreign exchange contracts [Member] | Notional Amount Maturing [Member]
Summary of customer related derivative positions, not designated as hedging
Fair Value	$ (463)

[1] The Company may enter into one swap agreement which offsets multiple reverse swap agreements. The positions will offset and the terms will be identical.