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Loans and Asset Quality Information (Schedule of Covered Purchased Nonimpaired Loans) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Covered purchased nonimpaired loans:    
Carrying amount of nonimpaired covered loans, beginning balance $ 101,252 $ 125,644
Principal repayments (3,975) (30,238)
Transfers to foreclosed real estate (869) (1,211)
Net loan (charge-offs) / recoveries 893 2,306
Accretion of loan discount 1,055 4,751
Balance, ending, carrying value $ 98,356 $ 101,252