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Loans and Allowance for Loan Losses - Impaired and Related Allowance (Details) - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Recorded investment in impaired loans:      
With no specific allowance recorded $ 4,429,000   $ 4,445,000
With a specific allowance recorded 12,118,000   12,481,000
Total recorded investment in impaired loans 16,547,000   16,926,000
Unpaid principal balance of impaired loans 16,500,000   17,019,000
Specific allowance 354,000   513,000
Average recorded investment in impaired loans during the period 16,736,000 $ 18,384,000  
Interest income recognized on impaired loans during the period ended 306,000 183,000  
Interest income recognized on impaired loans during the period ended, cash basis 128,000 0  
Outstanding commitments to extend credit on impaired loans 610,000   935,000
Commercial loans | Commercial and industrial      
Recorded investment in impaired loans:      
With no specific allowance recorded 307,000   309,000
With a specific allowance recorded 1,960,000   1,856,000
Total recorded investment in impaired loans 2,267,000   2,165,000
Unpaid principal balance of impaired loans 2,260,000   2,278,000
Specific allowance 35,000   50,000
Average recorded investment in impaired loans during the period 2,216,000 2,138,000  
Interest income recognized on impaired loans during the period ended 155,000 23,000  
Commercial real estate loans | Commercial real estate, owner-occupied      
Recorded investment in impaired loans:      
With no specific allowance recorded 0   0
With a specific allowance recorded 7,007,000   6,999,000
Total recorded investment in impaired loans 7,007,000   6,999,000
Unpaid principal balance of impaired loans 6,993,000   6,993,000
Specific allowance 162,000   188,000
Average recorded investment in impaired loans during the period 7,003,000 6,997,000  
Interest income recognized on impaired loans during the period ended 66,000 66,000  
Commercial real estate loans | Commercial real estate, investor      
Recorded investment in impaired loans:      
With no specific allowance recorded 0   0
With a specific allowance recorded 1,854,000   2,171,000
Total recorded investment in impaired loans 1,854,000   2,171,000
Unpaid principal balance of impaired loans 1,847,000   2,168,000
Specific allowance 48,000   159,000
Average recorded investment in impaired loans during the period 2,012,000 2,783,000  
Interest income recognized on impaired loans during the period ended 22,000 23,000  
Commercial real estate loans | Construction      
Recorded investment in impaired loans:      
With no specific allowance recorded 2,692,000   2,689,000
With a specific allowance recorded 284,000   280,000
Total recorded investment in impaired loans 2,976,000   2,969,000
Unpaid principal balance of impaired loans 2,962,000   2,963,000
Specific allowance 11,000   7,000
Average recorded investment in impaired loans during the period 2,972,000 3,243,000  
Interest income recognized on impaired loans during the period ended 38,000 34,000  
Residential loans | Home equity      
Recorded investment in impaired loans:      
With no specific allowance recorded 392,000   406,000
With a specific allowance recorded 347,000   347,000
Total recorded investment in impaired loans 739,000   753,000
Unpaid principal balance of impaired loans 736,000   750,000
Specific allowance 6,000   6,000
Average recorded investment in impaired loans during the period 746,000 713,000  
Interest income recognized on impaired loans during the period ended 5,000 8,000  
Residential loans | Other residential      
Recorded investment in impaired loans:      
With no specific allowance recorded 992,000   995,000
With a specific allowance recorded 0   153,000
Total recorded investment in impaired loans 992,000   1,148,000
Unpaid principal balance of impaired loans 991,000   1,147,000
Specific allowance 0   1,000
Average recorded investment in impaired loans during the period 1,070,000 1,571,000  
Interest income recognized on impaired loans during the period ended 13,000 19,000  
Consumer loans | Installment and other consumer      
Recorded investment in impaired loans:      
With no specific allowance recorded 46,000   46,000
With a specific allowance recorded 666,000   675,000
Total recorded investment in impaired loans 712,000   721,000
Unpaid principal balance of impaired loans 711,000   720,000
Specific allowance 92,000   $ 102,000
Average recorded investment in impaired loans during the period 717,000 939,000  
Interest income recognized on impaired loans during the period ended $ 7,000 $ 10,000