Derivatives and Hedging Activities (Details 7) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Offsetting Liabilities [Line Items]
Gross Amounts Recognized	$ 19,540	$ 30,426
Gross Amounts Offset in the Statement of Financial Position	0	0
Derivative Asset	19,540	30,426
Derivative, Collateral, Obligation to Return Securities	2,020	0
Derivative, Collateral, Obligation to Return Cash	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	17,520	30,426
Gross Amounts Recognized	30,667	46,570
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts Presented in the Statement of Financial Position	30,667	46,570
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	2,020	0
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Pledged	31,219	50,957
Net Amount	(2,572)	(4,387)
Interest rate swaps [Member]
Offsetting Liabilities [Line Items]
Gross Amounts Recognized	0	0
Gross Amounts Offset in the Statement of Financial Position	0	0
Derivative Asset	0	0
Derivative, Collateral, Obligation to Return Securities	0	0
Derivative, Collateral, Obligation to Return Cash	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	0
Gross Amounts Recognized	11,091	16,189
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts Presented in the Statement of Financial Position	11,091	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	15,483	19,185
Net Amount	(4,392)	(2,996)
Loan level swaps [Member]
Offsetting Liabilities [Line Items]
Gross Amounts Recognized	19,093	28,678
Gross Amounts Offset in the Statement of Financial Position	0	0
Derivative Asset	19,093	28,678
Derivative, Collateral, Obligation to Return Securities	2,020	0
Derivative, Collateral, Obligation to Return Cash	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	17,073	28,678
Gross Amounts Recognized	19,136	28,663
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts Presented in the Statement of Financial Position	19,136	28,663
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	2,020	0
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Pledged	15,736	31,772
Net Amount	1,380	(3,109)
Foreign exchange contracts [Member]
Offsetting Liabilities [Line Items]
Gross Amounts Recognized	447	1,748
Gross Amounts Offset in the Statement of Financial Position	0	0
Derivative Asset	447	1,748
Derivative, Collateral, Obligation to Return Securities	0	0
Derivative, Collateral, Obligation to Return Cash	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	447	1,748
Gross Amounts Recognized	440	1,718
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts Presented in the Statement of Financial Position	440	1,718
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	0	0
Net Amount	$ 440	$ 1,718