Derivatives and Hedging Activities (Details 3) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Fair value of derivative financial instruments as well as their classification on the balance sheet
Asset Derivatives	$ 19,540	$ 30,426
Liability Derivatives	30,667	46,570
Other Assets [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Asset Derivatives	19,540	30,426
Other Liabilities [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Liability Derivatives	19,576	30,381
Interest rate swaps [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Asset Derivatives	0	0
Liability Derivatives	11,091	16,189
Interest rate swaps [Member] | Derivatives designated as hedges [Member] | Other Assets [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Asset Derivatives
Interest rate swaps [Member] | Derivatives designated as hedges [Member] | Other Liabilities [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Liability Derivatives	11,091	16,189
Loan level swaps [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Asset Derivatives	19,093	28,678
Liability Derivatives	19,136	28,663
Loan level swaps [Member] | Derivatives not designated as hedges [Member] | Other Liabilities [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Liability Derivatives	19,136	28,663
Foreign exchange contracts [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Asset Derivatives	447	1,748
Liability Derivatives	440	1,718
Foreign exchange contracts [Member] | Derivatives not designated as hedges [Member] | Other Assets [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Asset Derivatives	447	1,748
Foreign exchange contracts [Member] | Derivatives not designated as hedges [Member] | Other Liabilities [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Liability Derivatives	$ 440	$ 1,718