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Loans and Allowance for Loan Losses - Impaired and Related Allowance (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
loan
Sep. 30, 2018
USD ($)
loan
Dec. 31, 2018
USD ($)
Recorded investment in impaired loans:          
With no specific allowance recorded $ 1,098,000   $ 1,098,000   $ 3,877,000
With a specific allowance recorded 11,253,000   11,253,000   11,161,000
Total recorded investment in impaired loans 12,351,000   12,351,000   15,038,000
Unpaid principal balance of impaired loans 12,307,000   12,307,000   15,013,000
Specific allowance 389,000   389,000   778,000
Average recorded investment in impaired loans during the period 12,327,000 $ 15,705,000 13,609,000 $ 16,212,000  
Interest income recognized on impaired loans during the period ended 522,000 182,000 844,000 665,000  
Interest income recognized on impaired loans during the period ended, cash basis 393,000 6,000 $ 416,000 134,000  
Number of impaired loans with interest income recognized | loan     3    
Charge-off amounts on impaired loans     $ 0   0
Outstanding commitments to extend credit on impaired loans 699,000   699,000   1,100,000
Commercial loans | Commercial and industrial          
Recorded investment in impaired loans:          
With no specific allowance recorded 375,000   375,000   303,000
With a specific allowance recorded 785,000   785,000   1,522,000
Total recorded investment in impaired loans 1,160,000   1,160,000   1,825,000
Unpaid principal balance of impaired loans 1,140,000   1,140,000   1,813,000
Specific allowance 183,000   183,000   466,000
Average recorded investment in impaired loans during the period 1,324,000 1,840,000 1,495,000 2,019,000  
Interest income recognized on impaired loans during the period ended 16,000 31,000 56,000 214,000  
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 6,999,000   6,999,000   6,993,000
Total recorded investment in impaired loans 6,999,000   6,999,000   6,993,000
Unpaid principal balance of impaired loans 6,993,000   6,993,000   6,993,000
Specific allowance 85,000   85,000   189,000
Average recorded investment in impaired loans during the period 7,000,000 7,000,000 6,998,000 7,002,000  
Interest income recognized on impaired loans during the period ended 67,000 67,000 199,000 199,000  
Commercial real estate loans | Commercial real estate, investor          
Recorded investment in impaired loans:          
With no specific allowance recorded 0   0   0
With a specific allowance recorded 1,786,000   1,786,000   1,821,000
Total recorded investment in impaired loans 1,786,000   1,786,000   1,821,000
Unpaid principal balance of impaired loans 1,776,000   1,776,000   1,812,000
Specific allowance 45,000   45,000   45,000
Average recorded investment in impaired loans during the period 1,791,000 1,837,000 1,804,000 1,925,000  
Interest income recognized on impaired loans during the period ended 20,000 20,000 59,000 63,000  
Commercial real estate loans | Construction          
Recorded investment in impaired loans:          
With no specific allowance recorded 0   0   2,688,000
With a specific allowance recorded 880,000   880,000   0
Total recorded investment in impaired loans 880,000   880,000   2,688,000
Unpaid principal balance of impaired loans 876,000   876,000   2,688,000
Specific allowance 12,000   12,000   0
Average recorded investment in impaired loans during the period 684,000 2,690,000 1,687,000 2,831,000  
Interest income recognized on impaired loans during the period ended 400,000 39,000 456,000 114,000  
Residential loans | Home equity          
Recorded investment in impaired loans:          
With no specific allowance recorded 168,000   168,000   313,000
With a specific allowance recorded 251,000   251,000   251,000
Total recorded investment in impaired loans 419,000   419,000   564,000
Unpaid principal balance of impaired loans 417,000   417,000   562,000
Specific allowance 5,000   5,000   5,000
Average recorded investment in impaired loans during the period 413,000 651,000 497,000 698,000  
Interest income recognized on impaired loans during the period ended 9,000 5,000 42,000 15,000  
Residential loans | Other residential          
Recorded investment in impaired loans:          
With no specific allowance recorded 454,000   454,000   462,000
With a specific allowance recorded 0   0   0
Total recorded investment in impaired loans 454,000   454,000   462,000
Unpaid principal balance of impaired loans 453,000   453,000   461,000
Specific allowance 0   0   0
Average recorded investment in impaired loans during the period 456,000 987,000 458,000 1,029,000  
Interest income recognized on impaired loans during the period ended 4,000 13,000 14,000 38,000  
Consumer loans | Installment and other consumer          
Recorded investment in impaired loans:          
With no specific allowance recorded 101,000   101,000   111,000
With a specific allowance recorded 552,000   552,000   574,000
Total recorded investment in impaired loans 653,000   653,000   685,000
Unpaid principal balance of impaired loans 652,000   652,000   684,000
Specific allowance 59,000   59,000   $ 73,000
Average recorded investment in impaired loans during the period 659,000 700,000 670,000 708,000  
Interest income recognized on impaired loans during the period ended $ 6,000 $ 7,000 $ 18,000 $ 22,000  
Purchased credit-impaired | Commercial loans          
Recorded investment in impaired loans:          
Number of impaired loans with interest income recognized | loan       3