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Loans and Allowance for Loan Losses - Impaired Loans and Related Allowance (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Recorded investment in impaired loans:      
With no specific allowance recorded $ 4,445,000 $ 4,209,000  
With a specific allowance recorded 12,481,000 14,104,000  
Total recorded investment in impaired loans 16,926,000 18,313,000  
Unpaid principal balance of impaired loans:      
Total unpaid principal balance of impaired loans 17,019,000 18,270,000  
Specific valuation 513,000 991,000  
Average recorded investment in impaired loans during the period 17,929,000 20,835,000 $ 23,273,000
Interest income recognized on impaired loans 825,000 2,223,000 826,000
Charged-off portion of impaired loans 0 0  
Outstanding commitments to extend credit on impaired loans 935,000 1,600,000  
Interest income recognized on impaired loans during the period ended, cash basis 100,000 1,400,000 0
Commercial | Commercial and industrial      
Recorded investment in impaired loans:      
With no specific allowance recorded 309,000 315,000  
With a specific allowance recorded 1,856,000 1,892,000  
Total recorded investment in impaired loans 2,165,000 2,207,000  
Unpaid principal balance of impaired loans:      
Total unpaid principal balance of impaired loans 2,278,000 2,177,000  
Specific valuation 50,000 285,000  
Average recorded investment in impaired loans during the period 2,113,000 3,514,000 4,237,000
Interest income recognized on impaired loans 202,000 175,000 238,000
Commercial real estate | Commercial real estate, owner-occupied      
Recorded investment in impaired loans:      
With no specific allowance recorded 0 0  
With a specific allowance recorded 6,999,000 6,993,000  
Total recorded investment in impaired loans 6,999,000 6,993,000  
Unpaid principal balance of impaired loans:      
Total unpaid principal balance of impaired loans 6,993,000 6,993,000  
Specific valuation 188,000 163,000  
Average recorded investment in impaired loans during the period 6,998,000 7,069,000 7,886,000
Interest income recognized on impaired loans 266,000 199,000 295,000
Commercial real estate | Commercial real estate, investor      
Recorded investment in impaired loans:      
With no specific allowance recorded 0 0  
With a specific allowance recorded 2,171,000 2,256,000  
Total recorded investment in impaired loans 2,171,000 2,256,000  
Unpaid principal balance of impaired loans:      
Total unpaid principal balance of impaired loans 2,168,000 2,252,000  
Specific valuation 159,000 375,000  
Average recorded investment in impaired loans during the period 2,842,000 2,950,000 2,833,000
Interest income recognized on impaired loans 87,000 1,514,000 33,000
Commercial real estate | Construction      
Recorded investment in impaired loans:      
With no specific allowance recorded 2,689,000 2,692,000  
With a specific allowance recorded 280,000 553,000  
Total recorded investment in impaired loans 2,969,000 3,245,000  
Unpaid principal balance of impaired loans:      
Total unpaid principal balance of impaired loans 2,963,000 3,238,000  
Specific valuation 7,000 8,000  
Average recorded investment in impaired loans during the period 3,132,000 3,242,000 4,164,000
Interest income recognized on impaired loans 147,000 137,000 86,000
Residential loans | Home equity      
Recorded investment in impaired loans:      
With no specific allowance recorded 406,000 91,000  
With a specific allowance recorded 347,000 624,000  
Total recorded investment in impaired loans 753,000 715,000  
Unpaid principal balance of impaired loans:      
Total unpaid principal balance of impaired loans 750,000 713,000  
Specific valuation 6,000 7,000  
Average recorded investment in impaired loans during the period 679,000 945,000 602,000
Interest income recognized on impaired loans 24,000 60,000 18,000
Residential loans | Other residential      
Recorded investment in impaired loans:      
With no specific allowance recorded 995,000 1,008,000  
With a specific allowance recorded 153,000 957,000  
Total recorded investment in impaired loans 1,148,000 1,965,000  
Unpaid principal balance of impaired loans:      
Total unpaid principal balance of impaired loans 1,147,000 1,965,000  
Specific valuation 1,000 55,000  
Average recorded investment in impaired loans during the period 1,324,000 1,988,000 2,028,000
Interest income recognized on impaired loans 62,000 90,000 92,000
Consumer loans | Installment and other consumer      
Recorded investment in impaired loans:      
With no specific allowance recorded 46,000 103,000  
With a specific allowance recorded 675,000 829,000  
Total recorded investment in impaired loans 721,000 932,000  
Unpaid principal balance of impaired loans:      
Total unpaid principal balance of impaired loans 720,000 932,000  
Specific valuation 102,000 98,000  
Average recorded investment in impaired loans during the period 841,000 1,127,000 1,523,000
Interest income recognized on impaired loans $ 37,000 $ 48,000 $ 64,000