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Fair Value Accounting (Details 1) - Fair Value on a Nonrecurring Basis [Member] - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Assets    
Impaired loans $ 10,794 $ 10,558
Total assets measured at fair value on a nonrecurring basis 10,794 10,558
Level 1 [Member]    
Assets    
Impaired loans
Total assets measured at fair value on a nonrecurring basis
Level 2 [Member]    
Assets    
Impaired loans 2,386 2,190
Total assets measured at fair value on a nonrecurring basis 2,386 2,190
Level 3 [Member]    
Assets    
Impaired loans 8,408 8,368
Total assets measured at fair value on a nonrecurring basis $ 8,408 $ 8,368