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Fair Value Measurements - Non-Recurring Assets (Details) - Nonrecurring - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Impaired loans    
Fair Value Measurements    
Fair value $ 12,110 $ 12,262
Impaired loans | Level I    
Fair Value Measurements    
Fair value 0 0
Impaired loans | Level II    
Fair Value Measurements    
Fair value 0 0
Impaired loans | Level III    
Fair Value Measurements    
Fair value 12,110 12,262
Other real estate owned    
Fair Value Measurements    
Fair value 485 143
Other real estate owned | Level I    
Fair Value Measurements    
Fair value 0 0
Other real estate owned | Level II    
Fair Value Measurements    
Fair value 0 0
Other real estate owned | Level III    
Fair Value Measurements    
Fair value $ 485 $ 143