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Contingent Liabilities and Commitments with Off-Balance Sheet Risk - Summary of Minimum Future Contractual Obligation Under Renewal of Contract (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Contingent Liabilities and Commitments with Off-Balance Sheet Risk [Line Items]  
2014 $ 11,821us-gaap_ContractualObligationDueInNextTwelveMonths
2015 8,444us-gaap_ContractualObligationDueInSecondYear
2016 $ 5,066us-gaap_ContractualObligationDueInThirdYear