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Fair Value of Financial Instruments, Quantitative Information about Level 3 Inputs (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Impaired loans measurement [Abstract]      
Impaired financing receivable, with related allowance, recorded investment $ 0 $ 7,010  
Impaired financing receivable, related allowance 0 807 $ 98
Financing receivable, provision expense   807  
Financing receivable, charge-offs   0  
Other real estate 0 0  
Other real estate, write-down $ 0 0  
Commercial Real Estate [Member] | Owner Occupied [Member]      
Impaired loans measurement [Abstract]      
Impaired financing receivable, with related allowance, recorded investment   2,030  
Impaired financing receivable, related allowance   385  
Commercial Real Estate [Member] | Nonowner-occupied [Member]      
Impaired loans measurement [Abstract]      
Impaired financing receivable, with related allowance, recorded investment     362
Impaired financing receivable, related allowance     $ 98
Commercial and Industrial [Member]      
Impaired loans measurement [Abstract]      
Impaired financing receivable, with related allowance, recorded investment   4,861  
Impaired financing receivable, related allowance   303  
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Commercial Real Estate [Member] | Owner Occupied [Member]      
Significant Unobservable Inputs Related to Assets and Liabilities Measured at Fair Value [Abstract]      
Impaired loans, fair value   $ 1,644  
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Commercial Real Estate [Member] | Owner Occupied [Member] | Adjustment to Comparable [Member] | Sales Approach [Member] | Minimum [Member]      
Significant Unobservable Inputs Related to Assets and Liabilities Measured at Fair Value [Abstract]      
Impaired loans, measurement inputs   0  
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Commercial Real Estate [Member] | Owner Occupied [Member] | Adjustment to Comparable [Member] | Sales Approach [Member] | Maximum [Member]      
Significant Unobservable Inputs Related to Assets and Liabilities Measured at Fair Value [Abstract]      
Impaired loans, measurement inputs   0.2  
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Commercial Real Estate [Member] | Owner Occupied [Member] | Adjustment to Comparable [Member] | Sales Approach [Member] | Weighted Average [Member]      
Significant Unobservable Inputs Related to Assets and Liabilities Measured at Fair Value [Abstract]      
Impaired loans, measurement inputs   0.097  
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Commercial and Industrial [Member]      
Significant Unobservable Inputs Related to Assets and Liabilities Measured at Fair Value [Abstract]      
Impaired loans, fair value   $ 4,559  
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Commercial and Industrial [Member] | Adjustment to Comparable [Member] | Sales Approach [Member] | Minimum [Member]      
Significant Unobservable Inputs Related to Assets and Liabilities Measured at Fair Value [Abstract]      
Impaired loans, measurement inputs   0  
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Commercial and Industrial [Member] | Adjustment to Comparable [Member] | Sales Approach [Member] | Maximum [Member]      
Significant Unobservable Inputs Related to Assets and Liabilities Measured at Fair Value [Abstract]      
Impaired loans, measurement inputs   0.61  
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Commercial and Industrial [Member] | Adjustment to Comparable [Member] | Sales Approach [Member] | Weighted Average [Member]      
Significant Unobservable Inputs Related to Assets and Liabilities Measured at Fair Value [Abstract]      
Impaired loans, measurement inputs   0.103