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Fair Value Accounting (Details 1) - Fair Value, Measurements, Nonrecurring [Member] - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Assets    
Impaired loans $ 8,769 $ 8,513
Other real estate owned 242 639
Total assets measured at fair value on a nonrecurring basis 9,011 9,152
Level 1 [Member]    
Assets    
Impaired loans
Other real estate owned
Total assets measured at fair value on a nonrecurring basis
Level 2 [Member]    
Assets    
Impaired loans 2,685 4,075
Other real estate owned 148 526
Total assets measured at fair value on a nonrecurring basis 2,833 4,601
Level 3 [Member]    
Assets    
Impaired loans 6,084 4,438
Other real estate owned 94 113
Total assets measured at fair value on a nonrecurring basis $ 6,178 $ 4,551