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Fair Value Measurements - Assets measured at fair value on a nonrecurring basis (Details) - Nonrecurring - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Assets    
Impaired loans $ 1,751 $ 1,602
Other real estate owned 3,866 4,224
Level 2    
Assets    
Other real estate owned   358
Level 3    
Assets    
Impaired loans 1,751 1,602
Other real estate owned $ 3,866 $ 3,866