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Fair Value of Financial Instruments - Assets Measured at Fair Value on Non-recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
OREO $ 1,248 $ 1,505 $ 1,489 $ 3,792
Fair Value, Inputs, Level 3 [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Impaired loans 3,661      
OREO 1,248      
Assets held-for-sale 198      
Fair Value, Nonrecurring [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Impaired loans 3,661 665    
OREO 1,248 1,505    
Assets held-for-sale 198 198    
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Impaired loans 3,661 665    
OREO 1,248 1,505    
Assets held-for-sale $ 198 $ 198