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Fair Value Measurements - Nonrecurring (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Assets and liabilities measured at fair value        
Valuation allowance $ 588 $ 144    
Carrying value of other real estate owned 7,063 8,371 $ 13,481 $ 11,916
OREO Valuation allowance 8,099 8,208 $ 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 15,997 13,484    
Nonrecurring | Impaired loans        
Assets and liabilities measured at fair value        
Total 8,934 5,113    
Valuation allowance 588 144,000,000    
Increase (decrease) of specific allocations within the provision for loan losses 444 856,000,000    
Nonrecurring | Impaired loans | Carrying Amount        
Assets and liabilities measured at fair value        
Total 9,500      
Nonrecurring | Other real estate owned        
Assets and liabilities measured at fair value        
Total 7,063 8,371    
Carrying value of other real estate owned 7,100 8,400    
Outstanding balance 16,100 17,500    
OREO Valuation allowance 8,100 8,200    
OREO participations 937,000,000 937,000    
Nonrecurring | Level 3        
Assets and liabilities measured at fair value        
Total 15,997 13,484    
Nonrecurring | Level 3 | Impaired loans        
Assets and liabilities measured at fair value        
Total 8,934 5,113    
Nonrecurring | Level 3 | Other real estate owned        
Assets and liabilities measured at fair value        
Total $ 7,063 $ 8,371