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Commitments and Contingent Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Commitments to Extend Credit Guarantees and Various Letters of Credit Outstanding    
Line of credit $ 642,187 $ 602,923
Loans approved but not closed 195,539 113,113
Overdraft limits 80,472 85,981
Letter of credit 32,367 37,719
Contingent obligations to purchase loans funded by other entities $ 7,499 $ 7,685