Derivatives and Hedging Activities (Details 6) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	$ 26,576	$ 30,426
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	26,576	30,426
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 Received	0	0
Net Amount	26,468	30,426
Interest rate swaps [Member]
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	0	0
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	0	0
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 Received	0	0
Net Amount	0	0
Loan level swaps [Member]
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	25,773	28,678
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	25,773	28,678
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 Received	0	0
Net Amount	25,773	28,678
Foreign exchange contracts [Member]
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	803	1,748
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	803	1,748
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 Received	0	0
Net Amount	$ 695	$ 1,748