Derivatives and Hedging Activities (Details 6) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	$ 18,704	$ 30,426
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	18,704	30,426
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 Received	0	0
Net Amount	16,861	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	18,413	28,678
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	18,413	28,678
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 Received	0	0
Net Amount	16,678	28,678
Foreign exchange contracts [Member]
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	291	1,748
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	291	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	$ 183	$ 1,748