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Fair Value Measurements - Nonrecurring (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Mar. 31, 2018
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Assets and liabilities measured at fair value            
Valuation allowance $ 498 $ 144        
Carrying value of other real estate owned 8,912 8,371 $ 7,063 $ 11,724 $ 13,481 $ 11,916
OREO Valuation allowance 8,348 8,208 $ 8,099 $ 8,304 $ 9,659 $ 9,982
Impaired loans            
Assets and liabilities measured at fair value            
Valuation allowance   5,300        
Nonrecurring            
Assets and liabilities measured at fair value            
Total 17,298 13,484        
Nonrecurring | Impaired loans            
Assets and liabilities measured at fair value            
Total 8,386 5,113        
Valuation allowance 498 144,000,000        
Increase (decrease) of specific allocations within the provision for loan losses 90 856,000,000        
Nonrecurring | Impaired loans | Carrying Amount            
Assets and liabilities measured at fair value            
Total 8,900          
Nonrecurring | Other real estate owned            
Assets and liabilities measured at fair value            
Total 8,912 8,371        
Carrying value of other real estate owned 8,900 8,400        
Outstanding balance 18,200 17,500        
OREO Valuation allowance 8,300 8,200        
OREO participations 937,000,000 937,000        
Nonrecurring | Level 3            
Assets and liabilities measured at fair value            
Total 17,298 13,484        
Nonrecurring | Level 3 | Impaired loans            
Assets and liabilities measured at fair value            
Total 8,386 5,113        
Nonrecurring | Level 3 | Other real estate owned            
Assets and liabilities measured at fair value            
Total $ 8,912 $ 8,371