Derivatives and Hedging Activities (Details 7) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	$ 30,635	$ 46,570
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	30,635	46,570
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	1,843	0
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Pledged	31,571	50,957
Net Amount	(2,779)	(4,387)
Interest rate swaps [Member]
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	11,921	16,189
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	11,921	16,189
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	0	0
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Pledged	15,774	19,185
Net Amount	(3,853)	(2,996)
Loan level swaps [Member]
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	18,437	28,663
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	18,437	28,663
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	1,735	0
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Pledged	15,797	31,772
Net Amount	905	(3,109)
Foreign exchange contracts [Member]
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	277	1,718
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	277	1,718
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	108	0
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Pledged	0	0
Net Amount	$ 169	$ 1,718