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Acquired Credit Impaired Loans, Outstanding Balance and Carrying Value for Acquired Credit Impaired Loans (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities [Abstract]    
Outstanding balance $ 8,179 $ 9,065
Carrying amount $ 6,620 $ 7,482