Derivatives and Hedging Activities (Details 3) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Fair value of derivative financial instruments as well as their classification on the balance sheet
Asset Derivatives	$ 18,704	$ 30,426
Liability Derivatives	30,635	46,570
Other Assets [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Asset Derivatives	18,704	30,426
Other Liabilities [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Liability Derivatives	18,714	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	11,921	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	11,921	16,189
Loan level swaps [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Asset Derivatives	18,413	28,678
Liability Derivatives	18,437	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	18,437	28,663
Foreign exchange contracts [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Asset Derivatives	291	1,748
Liability Derivatives	277	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	291	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	$ 277	$ 1,718