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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Recorded investment in impaired loans:          
With no specific allowance recorded $ 4,411,000   $ 4,411,000   $ 4,445,000
With a specific allowance recorded 11,120,000   11,120,000   12,481,000
Total recorded investment in impaired loans 15,531,000   15,531,000   16,926,000
Unpaid principal balance of impaired loans 15,502,000   15,502,000   17,019,000
Specific allowance 527,000   527,000   513,000
Average recorded investment in impaired loans during the period 15,705,000 $ 17,976,000 16,212,000 $ 18,180,000  
Interest income recognized on impaired loans during the period ended 182,000 183,000 665,000 544,000  
Interest income recognized on impaired loans during the period ended, cash basis 6,000 0 134,000 0  
Charge-off amounts on impaired loans     0   0
Outstanding commitments to extend credit on impaired loans 950,000   950,000   935,000
Commercial loans | Commercial and industrial          
Recorded investment in impaired loans:          
With no specific allowance recorded 304,000   304,000   309,000
With a specific allowance recorded 1,459,000   1,459,000   1,856,000
Total recorded investment in impaired loans 1,763,000   1,763,000   2,165,000
Unpaid principal balance of impaired loans 1,751,000   1,751,000   2,278,000
Specific allowance 173,000   173,000   50,000
Average recorded investment in impaired loans during the period 1,840,000 2,063,000 2,019,000 2,100,000  
Interest income recognized on impaired loans during the period ended 31,000 27,000 214,000 74,000  
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 6,997,000   6,997,000   6,999,000
Total recorded investment in impaired loans 6,997,000   6,997,000   6,999,000
Unpaid principal balance of impaired loans 6,993,000   6,993,000   6,993,000
Specific allowance 228,000   228,000   188,000
Average recorded investment in impaired loans during the period 7,000,000 7,000,000 7,002,000 6,998,000  
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 1,831,000   1,831,000   2,171,000
Total recorded investment in impaired loans 1,831,000   1,831,000   2,171,000
Unpaid principal balance of impaired loans 1,824,000   1,824,000   2,168,000
Specific allowance 44,000   44,000   159,000
Average recorded investment in impaired loans during the period 1,837,000 3,236,000 1,925,000 3,010,000  
Interest income recognized on impaired loans during the period ended 20,000 22,000 63,000 65,000  
Commercial real estate loans | Construction          
Recorded investment in impaired loans:          
With no specific allowance recorded 2,690,000   2,690,000   2,689,000
With a specific allowance recorded 0   0   280,000
Total recorded investment in impaired loans 2,690,000   2,690,000   2,969,000
Unpaid principal balance of impaired loans 2,688,000   2,688,000   2,963,000
Specific allowance 0   0   7,000
Average recorded investment in impaired loans during the period 2,690,000 3,104,000 2,831,000 3,174,000  
Interest income recognized on impaired loans during the period ended 39,000 39,000 114,000 110,000  
Residential loans | Home equity          
Recorded investment in impaired loans:          
With no specific allowance recorded 318,000   318,000   406,000
With a specific allowance recorded 251,000   251,000   347,000
Total recorded investment in impaired loans 569,000   569,000   753,000
Unpaid principal balance of impaired loans 567,000   567,000   750,000
Specific allowance 5,000   5,000   6,000
Average recorded investment in impaired loans during the period 651,000 607,000 698,000 660,000  
Interest income recognized on impaired loans during the period ended 5,000 5,000 15,000 19,000  
Residential loans | Other residential          
Recorded investment in impaired loans:          
With no specific allowance recorded 986,000   986,000   995,000
With a specific allowance recorded 0   0   153,000
Total recorded investment in impaired loans 986,000   986,000   1,148,000
Unpaid principal balance of impaired loans 985,000   985,000   1,147,000
Specific allowance 0   0   1,000
Average recorded investment in impaired loans during the period 987,000 1,164,000 1,029,000 1,367,000  
Interest income recognized on impaired loans during the period ended 13,000 14,000 38,000 48,000  
Consumer loans | Installment and other consumer          
Recorded investment in impaired loans:          
With no specific allowance recorded 113,000   113,000   46,000
With a specific allowance recorded 582,000   582,000   675,000
Total recorded investment in impaired loans 695,000   695,000   721,000
Unpaid principal balance of impaired loans 694,000   694,000   720,000
Specific allowance 77,000   77,000   $ 102,000
Average recorded investment in impaired loans during the period 700,000 802,000 708,000 871,000  
Interest income recognized on impaired loans during the period ended $ 7,000 $ 9,000 $ 22,000 $ 29,000