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Loans and Allowance for Loan Losses, Impaired Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
With an allowance recorded [Abstract]      
Unpaid principal balance $ 0    
Recorded investment 0 $ 7,010  
Total [Abstract]      
Unpaid principal balance 11,076 17,135 $ 14,376
Recorded investment 11,026 17,135 12,618
Allowance for Loan Losses Allocated 0 807 98
Impaired loans [Abstract]      
Average impaired loans - with an allowance recorded 0    
Interest income recognized - with an allowance recorded 0    
Cash basis interest recognized - with an allowance recorded 0    
Average impaired loans 8,276 15,153 11,067
Interest income recognized 510 1,268 748
Cash basis interest recognized 510 1,268 748
Residential Real Estate [Member]      
With no related allowance recorded [Abstract]      
Unpaid principal balance 418 438 1,667
Recorded investment 411 438 1,667
Impaired loans [Abstract]      
Average impaired loans - with no allowance recorded 423 453 511
Interest income recognized - with no allowance recorded 21 23 101
Cash basis interest recognized - with no allowance recorded 21 23 101
Commercial Real Estate [Member] | Owner-occupied [Member]      
With an allowance recorded [Abstract]      
Unpaid principal balance   2,030  
Recorded investment   2,030  
With no related allowance recorded [Abstract]      
Unpaid principal balance 5,256 1,778 2,527
Recorded investment 5,256 1,778 2,527
Total [Abstract]      
Allowance for Loan Losses Allocated   385  
Impaired loans [Abstract]      
Average impaired loans - with an allowance recorded   1,375  
Interest income recognized - with an allowance recorded   197  
Cash basis interest recognized - with an allowance recorded   197  
Average impaired loans - with no allowance recorded 3,417 1,902 2,475
Interest income recognized - with no allowance recorded 260 113 141
Cash basis interest recognized - with no allowance recorded 260 113 141
Commercial Real Estate [Member] | Nonowner-occupied [Member]      
With an allowance recorded [Abstract]      
Unpaid principal balance     362
Recorded investment     362
With no related allowance recorded [Abstract]      
Unpaid principal balance 632 7,492 2,368
Recorded investment 589 7,492 946
Total [Abstract]      
Allowance for Loan Losses Allocated     98
Impaired loans [Abstract]      
Average impaired loans - with an allowance recorded     367
Interest income recognized - with an allowance recorded     15
Cash basis interest recognized - with an allowance recorded     15
Average impaired loans - with no allowance recorded 626 6,160 1,912
Interest income recognized - with no allowance recorded 29 477 57
Cash basis interest recognized - with no allowance recorded 29 477 57
Commercial Real Estate [Member] | Construction [Member]      
With no related allowance recorded [Abstract]      
Unpaid principal balance     336
Recorded investment     0
Impaired loans [Abstract]      
Average impaired loans - with no allowance recorded     0
Interest income recognized - with no allowance recorded     20
Cash basis interest recognized - with no allowance recorded     20
Commercial and Industrial [Member]      
With an allowance recorded [Abstract]      
Unpaid principal balance   4,861  
Recorded investment   4,861  
With no related allowance recorded [Abstract]      
Unpaid principal balance 4,686 49 7,116
Recorded investment 4,686 49 7,116
Total [Abstract]      
Allowance for Loan Losses Allocated   303  
Impaired loans [Abstract]      
Average impaired loans - with an allowance recorded   4,796  
Interest income recognized - with an allowance recorded   319  
Cash basis interest recognized - with an allowance recorded   319  
Average impaired loans - with no allowance recorded 3,772 300 5,802
Interest income recognized - with no allowance recorded 196 111 414
Cash basis interest recognized - with no allowance recorded 196 111 $ 414
Consumer [Member] | Home Equity [Member]      
With no related allowance recorded [Abstract]      
Unpaid principal balance 34 368  
Recorded investment 34 368  
Impaired loans [Abstract]      
Average impaired loans - with no allowance recorded 28 143  
Interest income recognized - with no allowance recorded 2 19  
Cash basis interest recognized - with no allowance recorded 2 19  
Consumer [Member] | Automobile [Member]      
With an allowance recorded [Abstract]      
Unpaid principal balance   8  
Recorded investment   8  
Total [Abstract]      
Allowance for Loan Losses Allocated   8  
Impaired loans [Abstract]      
Average impaired loans - with an allowance recorded   2  
Interest income recognized - with an allowance recorded   0  
Cash basis interest recognized - with an allowance recorded   0  
Consumer [Member] | Other [Member]      
With an allowance recorded [Abstract]      
Unpaid principal balance   111  
Recorded investment   111  
With no related allowance recorded [Abstract]      
Unpaid principal balance 50    
Recorded investment 50    
Total [Abstract]      
Allowance for Loan Losses Allocated   111  
Impaired loans [Abstract]      
Average impaired loans - with an allowance recorded   22  
Interest income recognized - with an allowance recorded   9  
Cash basis interest recognized - with an allowance recorded   $ 9  
Average impaired loans - with no allowance recorded 10    
Interest income recognized - with no allowance recorded 2    
Cash basis interest recognized - with no allowance recorded $ 2