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Fair Value Accounting (Details 1) - Fair Value on a Nonrecurring Basis [Member] - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Assets    
Impaired loans $ 11,648 $ 8,769
Other real estate owned 117 242
Total assets measured at fair value on a nonrecurring basis 11,765 9,011
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 2,920 2,685
Other real estate owned 23 148
Total assets measured at fair value on a nonrecurring basis 2,943 2,833
Level 3 [Member]    
Assets    
Impaired loans 8,728 6,084
Other real estate owned 94 94
Total assets measured at fair value on a nonrecurring basis $ 8,822 $ 6,178