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Fair Value Measurements - Nonrecurring (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Assets and liabilities measured at fair value          
Valuation allowance $ 5,400,000 $ 2,600,000      
Valuation allowance 18,500,000 12,300,000      
Increase (decrease) of specific allocations within the provision for loan losses 2,700,000 1,400,000      
Carrying value of other real estate owned 2,356,000 2,474,000 $ 5,004,000   $ 7,175,000
OREO Valuation allowance 1,179,000 1,643,000 6,712,000 $ 8,027,000  
Fair Value, Measurements, Nonrecurring [Member]          
Assets and liabilities measured at fair value          
Total 15,494,000 12,149,000      
Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member]          
Assets and liabilities measured at fair value          
Total 13,138,000 9,675,000      
Valuation allowance 18,500,000        
Increase (decrease) of specific allocations within the provision for loan losses 2,700,000        
Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate Owned [Member]          
Assets and liabilities measured at fair value          
Total 2,356,000 2,474,000      
Carrying value of other real estate owned 2,400,000 2,500,000 2,500,000    
Outstanding balance 3,700,000 4,100,000      
OREO Valuation allowance 1,200,000 1,600,000 $ 1,600,000    
OREO participations 131,000        
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]          
Assets and liabilities measured at fair value          
Total 15,494,000 12,149,000      
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member]          
Assets and liabilities measured at fair value          
Total 13,138,000 9,675,000      
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member]          
Assets and liabilities measured at fair value          
Total $ 2,356,000 $ 2,474,000