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Loans and Asset Quality Information (Schedule of Covered Purchased Nonimpaired Loans) (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Covered purchased nonimpaired loans:    
Carrying amount of nonimpaired covered loans, beginning balance $ 125,644 $ 207,167
Principal repayments (15,709) (50,183)
Transfers to foreclosed real estate (656) (5,061)
Transfers to non-covered loans due to expiration of loss-share agreement   (38,987)
Net loan (charge-offs) / recoveries 82 (3,301)
Accretion of loan discount 2,692 16,009
Balance, ending, carrying value $ 112,053 $ 125,644