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Deposits - Additional Information (Details) (USD $)
6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Banking and Thrift [Abstract]    
Certificates of deposit denominations $ 100,000  
Aggregate amount of certificates of deposit in denominations of $100,000 or more $ 282,430,000 $ 253,464,000