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Fair Value Measurements - Nonrecurring (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Assets and liabilities measured at fair value        
Valuation allowance $ 1,212,000      
Valuation allowance 1,135,000 $ 352,000    
Carrying value of other real estate owned 5,004,000 7,175,000 $ 8,371,000 $ 11,916,000
OREO Valuation allowance 6,712,000 8,027,000 $ 8,208,000 $ 9,982,000
Fair Value, Measurements, Nonrecurring [Member]        
Assets and liabilities measured at fair value        
Total 12,439,000 19,338,000    
Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member]        
Assets and liabilities measured at fair value        
Total 7,435,000 12,163,000    
Valuation allowance 8,600,000 12,500,000    
Increase (decrease) of specific allocations within the provision for loan losses 783,000 (208,000)    
Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate Owned [Member]        
Assets and liabilities measured at fair value        
Total 5,004,000 7,175,000    
Carrying value of other real estate owned 5,000,000 7,200,000    
Outstanding balance 12,600,000 16,100,000    
OREO Valuation allowance 6,700,000 8,000,000    
OREO participations 937,000 900,000    
Fair Value, Measurements, Nonrecurring [Member] | Level 3        
Assets and liabilities measured at fair value        
Total 12,439,000 19,338,000    
Fair Value, Measurements, Nonrecurring [Member] | Level 3 | Impaired Loans [Member]        
Assets and liabilities measured at fair value        
Total 7,435,000 12,163,000    
Fair Value, Measurements, Nonrecurring [Member] | Level 3 | Other Real Estate Owned [Member]        
Assets and liabilities measured at fair value        
Total $ 5,004,000 $ 7,175,000