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Loans, Troubled Debt Restructurings Segregated by Class (Details)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
Loan
Sep. 30, 2020
USD ($)
Loan
Sep. 30, 2021
USD ($)
Loan
Sep. 30, 2020
USD ($)
Loan
Dec. 31, 2020
USD ($)
Loan
Troubled Debt Restructurings Segregated by Class [Abstract]          
Number of Loans | Loan 7 6 14 40 47
Pre-Modification Outstanding Recorded Investment $ 5,016 $ 4,857 $ 7,815 $ 16,070 $ 17,879
Post-Modification Outstanding Balance 5,113 $ 4,914 7,853 $ 16,042 17,850
Commitment to extend additional credit on loans modified in TDRs $ 136   $ 136   85
Defaulted restructured loans, number of loans | Loan 0 0 2 3  
Defaulted restructured loans, recorded balance     $ 1,388 $ 368  
Term Modification [Member]          
Troubled Debt Restructurings Segregated by Class [Abstract]          
Pre-Modification Outstanding Recorded Investment $ 2,448 $ 4,857 4,827 13,726 15,235
Post-Modification Outstanding Balance 2,551 4,914 4,853 13,698 15,208
Combination [Member]          
Troubled Debt Restructurings Segregated by Class [Abstract]          
Pre-Modification Outstanding Recorded Investment 2,568 0 2,988 2,344 2,644
Post-Modification Outstanding Balance $ 2,562 $ 0 $ 3,000 $ 2,344 $ 2,642
Commercial [Member]          
Troubled Debt Restructurings Segregated by Class [Abstract]          
Number of Loans | Loan 7 5 14 37 43
Pre-Modification Outstanding Recorded Investment $ 5,016 $ 4,574 $ 7,815 $ 14,854 $ 16,383
Post-Modification Outstanding Balance 5,113 4,632 7,853 14,839 16,371
Commercial [Member] | Term Modification [Member]          
Troubled Debt Restructurings Segregated by Class [Abstract]          
Pre-Modification Outstanding Recorded Investment 2,448 4,574 4,827 12,510 13,739
Post-Modification Outstanding Balance 2,551 4,632 4,853 12,495 13,729
Commercial [Member] | Combination [Member]          
Troubled Debt Restructurings Segregated by Class [Abstract]          
Pre-Modification Outstanding Recorded Investment 2,568 0 2,988 2,344 2,644
Post-Modification Outstanding Balance $ 2,562 $ 0 $ 3,000 $ 2,344 $ 2,642
Commercial [Member] | Hotel/Motel [Member]          
Troubled Debt Restructurings Segregated by Class [Abstract]          
Number of Loans | Loan 0   0   1
Pre-Modification Outstanding Recorded Investment $ 0   $ 0   $ 1,113
Post-Modification Outstanding Balance 0   $ 0   1,113
Defaulted restructured loans, number of loans | Loan     1 0  
Defaulted restructured loans, recorded balance     $ 1,113 $ 0  
Commercial [Member] | Hotel/Motel [Member] | Term Modification [Member]          
Troubled Debt Restructurings Segregated by Class [Abstract]          
Pre-Modification Outstanding Recorded Investment 0   0   1,113
Post-Modification Outstanding Balance 0   0   1,113
Commercial [Member] | Hotel/Motel [Member] | Combination [Member]          
Troubled Debt Restructurings Segregated by Class [Abstract]          
Pre-Modification Outstanding Recorded Investment 0   0   0
Post-Modification Outstanding Balance $ 0   $ 0   $ 0
Commercial [Member] | Commercial Real Estate Residential [Member]          
Troubled Debt Restructurings Segregated by Class [Abstract]          
Number of Loans | Loan 2 1 2 12 12
Pre-Modification Outstanding Recorded Investment $ 255 $ 101 $ 255 $ 6,503 $ 6,503
Post-Modification Outstanding Balance 254 101 254 6,505 6,505
Commercial [Member] | Commercial Real Estate Residential [Member] | Term Modification [Member]          
Troubled Debt Restructurings Segregated by Class [Abstract]          
Pre-Modification Outstanding Recorded Investment 255 101 255 4,694 4,694
Post-Modification Outstanding Balance 254 101 254 4,696 4,696
Commercial [Member] | Commercial Real Estate Residential [Member] | Combination [Member]          
Troubled Debt Restructurings Segregated by Class [Abstract]          
Pre-Modification Outstanding Recorded Investment 0 0 0 1,809 1,809
Post-Modification Outstanding Balance $ 0 $ 0 $ 0 $ 1,809 $ 1,809
Commercial [Member] | Commercial Real Estate Nonresidential [Member]          
Troubled Debt Restructurings Segregated by Class [Abstract]          
Number of Loans | Loan 4 3 9 15 18
Pre-Modification Outstanding Recorded Investment $ 4,666 $ 4,421 $ 7,167 $ 7,695 $ 8,077
Post-Modification Outstanding Balance 4,758 4,479 7,282 7,744 8,131
Commercial [Member] | Commercial Real Estate Nonresidential [Member] | Term Modification [Member]          
Troubled Debt Restructurings Segregated by Class [Abstract]          
Pre-Modification Outstanding Recorded Investment 2,098 4,421 4,179 7,185 7,295
Post-Modification Outstanding Balance 2,196 4,479 4,282 7,234 7,349
Commercial [Member] | Commercial Real Estate Nonresidential [Member] | Combination [Member]          
Troubled Debt Restructurings Segregated by Class [Abstract]          
Pre-Modification Outstanding Recorded Investment 2,568 0 2,988 510 782
Post-Modification Outstanding Balance $ 2,562 $ 0 $ 3,000 $ 510 $ 782
Commercial [Member] | Commercial Other [Member]          
Troubled Debt Restructurings Segregated by Class [Abstract]          
Number of Loans | Loan 1 1 3 10 12
Pre-Modification Outstanding Recorded Investment $ 95 $ 52 $ 393 $ 656 $ 690
Post-Modification Outstanding Balance 101 52 $ 317 $ 590 622
Defaulted restructured loans, number of loans | Loan     0 3  
Defaulted restructured loans, recorded balance     $ 0 $ 368  
Commercial [Member] | Commercial Other [Member] | Term Modification [Member]          
Troubled Debt Restructurings Segregated by Class [Abstract]          
Pre-Modification Outstanding Recorded Investment 95 52 393 631 637
Post-Modification Outstanding Balance 101 52 317 565 571
Commercial [Member] | Commercial Other [Member] | Combination [Member]          
Troubled Debt Restructurings Segregated by Class [Abstract]          
Pre-Modification Outstanding Recorded Investment 0 0 0 25 53
Post-Modification Outstanding Balance $ 0 $ 0 $ 0 $ 25 $ 51
Residential [Member]          
Troubled Debt Restructurings Segregated by Class [Abstract]          
Number of Loans | Loan   1   3 4
Pre-Modification Outstanding Recorded Investment   $ 283   $ 1,216 $ 1,496
Post-Modification Outstanding Balance   282   1,203 1,479
Residential [Member] | Term Modification [Member]          
Troubled Debt Restructurings Segregated by Class [Abstract]          
Pre-Modification Outstanding Recorded Investment   283   1,216 1,496
Post-Modification Outstanding Balance   282   1,203 1,479
Residential [Member] | Combination [Member]          
Troubled Debt Restructurings Segregated by Class [Abstract]          
Pre-Modification Outstanding Recorded Investment   0   0 0
Post-Modification Outstanding Balance   $ 0   $ 0 $ 0
Residential [Member] | Real Estate Mortgage [Member]          
Troubled Debt Restructurings Segregated by Class [Abstract]          
Number of Loans | Loan   1   3 4
Pre-Modification Outstanding Recorded Investment   $ 283   $ 1,216 $ 1,496
Post-Modification Outstanding Balance   282   $ 1,203 1,479
Defaulted restructured loans, number of loans | Loan     1 0  
Defaulted restructured loans, recorded balance     $ 275 $ 0  
Residential [Member] | Real Estate Mortgage [Member] | Term Modification [Member]          
Troubled Debt Restructurings Segregated by Class [Abstract]          
Pre-Modification Outstanding Recorded Investment   283   1,216 1,496
Post-Modification Outstanding Balance   282   1,203 1,479
Residential [Member] | Real Estate Mortgage [Member] | Combination [Member]          
Troubled Debt Restructurings Segregated by Class [Abstract]          
Pre-Modification Outstanding Recorded Investment   0   0 0
Post-Modification Outstanding Balance   $ 0   $ 0 $ 0