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Financial Instruments with Off-Statement of Condition Risk and Concentrations of Credit Risk (Tables)
12 Months Ended
Dec. 31, 2012
Financial Instruments with Off-Statement of Condition Risk and Concentrations of Credit Risk  
Schedule of financial amounts of instruments, whose contract amounts represent credit risks

At December 31, 2012, the following financial amounts of instruments, whose contract amounts represent credit risks, were outstanding:

Commitments to extend credit

  $ 1,481,285,000  

Credit card lines

    66,243,000  

Standby letters of credit

    89,129,000  

Commercial letters of credit

    13,753,000