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Loans - Outstanding Principal and Carrying Amount of Acquired Loans (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Outstanding principal balance and the carrying amount of loan acquired [Abstract]    
Outstanding principal balance $ 91,983 $ 104,172
Carrying amount 85,283 96,487
Outstanding principal balance and the carrying amount of loan acquired, impaired [Abstract]    
Outstanding principal balance 32,206 34,378
Carrying amount $ 27,040 $ 28,669