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Fair Value (Details 5) - Fair Value, Measurements, Nonrecurring - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Assets measured on a nonrecurring basis:    
Impaired loans $ 9,620 $ 6,788
Level 3    
Assets measured on a nonrecurring basis:    
Impaired loans $ 9,620 $ 6,788