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Loans and Asset Quality Information (Details 3) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Covered purchased nonimpaired loans:    
Carrying amount of nonimpaired covered loans, beginning balance $ 207,167 $ 277,489
Principal repayments (43,323) (63,588)
Transfers to foreclosed real estate (4,658) (13,977)
Transfers to non-covered loans due to expiration of loss-share agreement (38,987)  
Loan charge-offs (2,824) (12,957)
Accretion of loan discount 13,836 20,200
Balance, ending, carrying value $ 131,211 $ 207,167