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Loans and Allowance for Loan Losses - Current Value of Loans Purchased Credit Impaired at the Time of Acquisition (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Receivables [Abstract]    
Contractually-required principal and interest $ 22,961 $ 31,381
Nonaccretable difference (4,459) (8,369)
Cash flows expected to be collected 18,502 23,012
Accretable yield (2,444) (1,637)
Carrying value $ 16,058 $ 21,375