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Fair Value Measurements - Assets measured at fair value on a nonrecurring basis (Details) - Nonrecurring - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Assets    
Impaired loans $ 5,690 $ 6,587
Other real estate owned 3,866 3,866
Level 3    
Assets    
Impaired loans 5,690 6,587
Other real estate owned $ 3,866 $ 3,866