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Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
OREO $ 1,078 $ 1,505 $ 3,792
Fair Value, Inputs, Level 3 [Member]      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Impaired loans 29    
OREO 1,078    
Assets held-for-sale $ 198    
Fair Value, Inputs, Level 3 [Member] | Minimum [Member] | Measurement Input, Comparability Adjustment [Member]      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Impaired loans 0.09    
OREO 0.09    
Assets held-for-sale 0.09    
Fair Value, Inputs, Level 3 [Member] | Maximum [Member] | Measurement Input, Comparability Adjustment [Member]      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Impaired loans 0.10    
OREO 0.10    
Assets held-for-sale 0.10    
Fair Value, Inputs, Level 3 [Member] | Weighted Average [Member] | Measurement Input, Comparability Adjustment [Member]      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Impaired loans 0.095    
OREO 0.095    
Assets held-for-sale 0.095