Derivatives and Hedging Activities (Customer Related Derivative Positions - Not Designated as Hedges) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Summary of customer related derivative positions, not designated as hedging
Total	$ 75,000		$ 150,000
Derivative Asset, Fair Value, Gross Asset	18,860		16,697
Fair Value	(5,923)		(9,630)
Loan level derivatives
Summary of customer related derivative positions, not designated as hedging
Derivative Asset, Fair Value, Gross Asset	14,820		16,301
Foreign exchange contracts
Summary of customer related derivative positions, not designated as hedging
Derivative Asset, Fair Value, Gross Asset	4,040		396
Not Designated as Hedging Instrument | Receive fixed, pay variable | Loan level derivatives
Summary of customer related derivative positions, not designated as hedging
Number of Positions	172	[1]	168	[1]
Less than 1 year	47,702		48,882
Less than 2 years	85,305		97,975
Less than 3 years	27,960		42,957
Less than 4 years	44,931		42,116
Thereafter	382,700		329,554
Total	588,598		561,484
Fair Value	12,300		9,484
Not Designated as Hedging Instrument | Pay fixed, receive variable | Loan level derivatives
Summary of customer related derivative positions, not designated as hedging
Number of Positions	166	[1]	162	[1]
Less than 1 year	47,702		48,882
Less than 2 years	85,305		97,975
Less than 3 years	27,960		42,957
Less than 4 years	44,931		42,116
Thereafter	382,700		329,554
Total	588,598		561,484
Fair Value	(12,309)		(9,523)
Not Designated as Hedging Instrument | Buys foreign currency, sells US currency | Foreign exchange contracts
Summary of customer related derivative positions, not designated as hedging
Number of Positions	27	[1]	6	[1]
Less than 1 year	64,914		11,367
Less than 2 years
Less than 3 years
Less than 4 years
Thereafter
Total	64,914		11,367
Derivative Asset, Fair Value, Gross Asset	4,040
Fair Value			396
Not Designated as Hedging Instrument | Buys US currency, sells foreign currency | Foreign exchange contracts
Summary of customer related derivative positions, not designated as hedging
Number of Positions	27	[1]	6	[1]
Less than 1 year	64,914		11,367
Less than 2 years
Less than 3 years
Less than 4 years
Thereafter
Total	64,914		11,367
Fair Value	$ (4,012)		$ (390)

[1] The Company may enter into one dealer swap agreement which offsets multiple commercial borrower swap agreements.