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Loans and Allowance for Loan Losses - Impaired and Related Allowance (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Recorded investment in impaired loans:          
With no specific allowance recorded $ 1,797,000   $ 1,797,000   $ 1,066,000
With a specific allowance recorded 11,970,000   11,970,000   10,434,000
Total recorded investment in impaired loans 13,767,000   13,767,000   11,500,000
Unpaid principal balance of impaired loans 13,760,000   13,760,000   11,471,000
Specific allowance 1,106,000   1,106,000   397,000
Average recorded investment in impaired loans during the period 12,833,000 $ 12,327,000 12,475,000 $ 13,609,000  
Interest income recognized on impaired loans during the period ended 115,000 522,000 333,000 844,000  
Interest income, cash basis, recognized on impaired loans during the period 0 393,000 0 416,000  
Charge-off amounts on impaired loans     0   0
Outstanding commitments to extend credit on impaired loans 500,000   500,000   534,000
Commercial loans | Commercial and industrial          
Recorded investment in impaired loans:          
With no specific allowance recorded 291,000   291,000   349,000
With a specific allowance recorded 726,000   726,000   874,000
Total recorded investment in impaired loans 1,017,000   1,017,000   1,223,000
Unpaid principal balance of impaired loans 1,012,000   1,012,000   1,209,000
Specific allowance 19,000   19,000   103,000
Average recorded investment in impaired loans during the period 798,000 1,324,000 948,000 1,495,000  
Interest income recognized on impaired loans during the period ended 11,000 16,000 32,000 56,000  
Commercial real estate loans | Commercial real estate, owner-occupied          
Recorded investment in impaired loans:          
With no specific allowance recorded 0   0   0
With a specific allowance recorded 7,003,000   7,003,000   6,998,000
Total recorded investment in impaired loans 7,003,000   7,003,000   6,998,000
Unpaid principal balance of impaired loans 6,993,000   6,993,000   6,992,000
Specific allowance 225,000   225,000   195,000
Average recorded investment in impaired loans during the period 7,002,000 7,000,000 7,000,000 6,998,000  
Interest income recognized on impaired loans during the period ended 64,000 67,000 197,000 199,000  
Commercial real estate loans | Commercial real estate, investor-owned          
Recorded investment in impaired loans:          
With no specific allowance recorded 885,000   885,000   0
With a specific allowance recorded 3,310,000   3,310,000   1,770,000
Total recorded investment in impaired loans 4,195,000   4,195,000   1,770,000
Unpaid principal balance of impaired loans 4,187,000   4,187,000   1,764,000
Specific allowance 697,000   697,000   41,000
Average recorded investment in impaired loans during the period 3,430,000 1,791,000 2,832,000 1,804,000  
Interest income recognized on impaired loans during the period ended 30,000 20,000 68,000 59,000  
Commercial real estate loans | Construction          
Recorded investment in impaired loans:          
With no specific allowance recorded 0   0   0
With a specific allowance recorded 0   0   0
Total recorded investment in impaired loans 0   0   0
Unpaid principal balance of impaired loans 0   0   0
Specific allowance 0   0   0
Average recorded investment in impaired loans during the period 0 684,000 0 1,687,000  
Interest income recognized on impaired loans during the period ended 0 400,000 0 456,000  
Residential loans | Home equity          
Recorded investment in impaired loans:          
With no specific allowance recorded 532,000   532,000   167,000
With a specific allowance recorded 251,000   251,000   251,000
Total recorded investment in impaired loans 783,000   783,000   418,000
Unpaid principal balance of impaired loans 801,000   801,000   417,000
Specific allowance 4,000   4,000   5,000
Average recorded investment in impaired loans during the period 829,000 413,000 740,000 497,000  
Interest income recognized on impaired loans during the period ended 3,000 9,000 10,000 42,000  
Residential loans | Other residential          
Recorded investment in impaired loans:          
With no specific allowance recorded 0   0   452,000
With a specific allowance recorded 0   0   0
Total recorded investment in impaired loans 0   0   452,000
Unpaid principal balance of impaired loans 0   0   451,000
Specific allowance 0   0   0
Average recorded investment in impaired loans during the period 0 456,000 225,000 458,000  
Interest income recognized on impaired loans during the period ended 0 4,000 4,000 14,000  
Consumer loans | Installment and other consumer          
Recorded investment in impaired loans:          
With no specific allowance recorded 89,000   89,000   98,000
With a specific allowance recorded 680,000   680,000   541,000
Total recorded investment in impaired loans 769,000   769,000   639,000
Unpaid principal balance of impaired loans 767,000   767,000   638,000
Specific allowance 161,000   161,000   $ 53,000
Average recorded investment in impaired loans during the period 774,000 659,000 730,000 670,000  
Interest income recognized on impaired loans during the period ended $ 7,000 $ 6,000 $ 22,000 $ 18,000