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Commitments and Contingent Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Commitments to extend credit, guarantees and various letters of credit outstanding    
Lines of credit $ 872,377 $ 769,525
Loans approved but not closed 127,218 218,531
Overdraft limits 88,234 93,654
Letters of credit 20,201 20,078
Contingent obligations to purchase loans funded by other entities $ 6,496 $ 6,668