Derivatives and Hedging Activities (Details 3) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Fair value of derivative financial instruments as well as their classification on the balance sheet
Asset Derivatives	$ 26,576	$ 30,426
Liability Derivatives	41,262	46,570
Other Assets [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Asset Derivatives	26,576	30,426
Other Liabilities [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Liability Derivatives	26,544	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	14,718	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	14,718	16,189
Loan level swaps [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Asset Derivatives	25,773	28,678
Liability Derivatives	25,765	28,663
Loan level swaps [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	25,773	28,678
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	25,765	28,663
Foreign exchange contracts [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Asset Derivatives	803	1,748
Liability Derivatives	779	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	803	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	$ 779	$ 1,718