Derivatives and Hedging Activities (Details 3) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Other Assets [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Asset Derivatives	$ 31,840	$ 25,576
Other Liabilities [Member]
Fair value of derivative financial instruments as well as their classification on the balance sheet
Liability Derivatives	31,817	25,616
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	17,664	18,263
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	30,691	24,478
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	30,697	24,535
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	1,149	1,098
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	$ 1,120	$ 1,081