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Loans and Allowance for Loan Losses - Impaired Loans and Related Allowance (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Recorded investment in impaired loans:          
With no specific allowance recorded $ 5,363,000   $ 5,363,000   $ 4,209,000
With a specific allowance recorded 12,337,000   12,337,000   14,104,000
Total recorded investment in impaired loans 17,700,000   17,700,000   18,313,000
Unpaid principal balance of impaired loans 17,675,000   17,675,000   18,270,000
Specific allowance 586,000   586,000   991,000
Average recorded investment in impaired loans during the period 17,976,000 $ 21,139,000 18,180,000 $ 21,788,000  
Interest income recognized on impaired loans during the period ended 183,000 1,600,000 544,000 2,021,000  
Interest income recognized on impaired loans during the period ended, cash basis 0 1,400,000.0 0 1,400,000.0  
Outstanding commitments to extend credit on impaired loans 1,100,000   1,100,000   1,600,000
Commercial loans | Commercial and industrial          
Recorded investment in impaired loans:          
With no specific allowance recorded 311,000   311,000   315,000
With a specific allowance recorded 1,740,000   1,740,000   1,892,000
Total recorded investment in impaired loans 2,051,000   2,051,000   2,207,000
Unpaid principal balance of impaired loans 2,030,000   2,030,000   2,177,000
Specific allowance 35,000   35,000   285,000
Average recorded investment in impaired loans during the period 2,063,000 3,352,000 2,100,000 3,802,000  
Interest income recognized on impaired loans during the period ended 27,000 44,000 74,000 142,000  
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 84,000   84,000   163,000
Average recorded investment in impaired loans during the period 7,000,000 7,169,000 6,998,000 7,081,000  
Interest income recognized on impaired loans during the period ended 67,000 67,000 199,000 133,000  
Commercial real estate loans | Commercial real estate, investor          
Recorded investment in impaired loans:          
With no specific allowance recorded 1,024,000   1,024,000   0
With a specific allowance recorded 2,193,000   2,193,000   2,256,000
Total recorded investment in impaired loans 3,217,000   3,217,000   2,256,000
Unpaid principal balance of impaired loans 3,230,000   3,230,000   2,252,000
Specific allowance 369,000   369,000   375,000
Average recorded investment in impaired loans during the period 3,236,000 3,146,000 3,010,000 3,397,000  
Interest income recognized on impaired loans during the period ended 22,000 1,385,000 65,000 1,489,000  
Commercial real estate loans | Construction          
Recorded investment in impaired loans:          
With no specific allowance recorded 2,691,000   2,691,000   2,692,000
With a specific allowance recorded 278,000   278,000   553,000
Total recorded investment in impaired loans 2,969,000   2,969,000   3,245,000
Unpaid principal balance of impaired loans 2,963,000   2,963,000   3,238,000
Specific allowance 5,000   5,000   8,000
Average recorded investment in impaired loans during the period 3,104,000 3,238,000 3,174,000 3,238,000  
Interest income recognized on impaired loans during the period ended 39,000 32,000 110,000 105,000  
Residential loans | Home equity          
Recorded investment in impaired loans:          
With no specific allowance recorded 292,000   292,000   91,000
With a specific allowance recorded 348,000   348,000   624,000
Total recorded investment in impaired loans 640,000   640,000   715,000
Unpaid principal balance of impaired loans 637,000   637,000   713,000
Specific allowance 6,000   6,000   7,000
Average recorded investment in impaired loans during the period 607,000 1,140,000 660,000 1,098,000  
Interest income recognized on impaired loans during the period ended 5,000 38,000 19,000 48,000  
Residential loans | Other residential          
Recorded investment in impaired loans:          
With no specific allowance recorded 998,000   998,000   1,008,000
With a specific allowance recorded 160,000   160,000   957,000
Total recorded investment in impaired loans 1,158,000   1,158,000   1,965,000
Unpaid principal balance of impaired loans 1,157,000   1,157,000   1,965,000
Specific allowance 2,000   2,000   55,000
Average recorded investment in impaired loans during the period 1,164,000 1,981,000 1,367,000 1,993,000  
Interest income recognized on impaired loans during the period ended 14,000 22,000 48,000 67,000  
Consumer loans | Installment and other consumer          
Recorded investment in impaired loans:          
With no specific allowance recorded 47,000   47,000   103,000
With a specific allowance recorded 619,000   619,000   829,000
Total recorded investment in impaired loans 666,000   666,000   932,000
Unpaid principal balance of impaired loans 665,000   665,000   932,000
Specific allowance 85,000   85,000   $ 98,000
Average recorded investment in impaired loans during the period 802,000 1,113,000 871,000 1,179,000  
Interest income recognized on impaired loans during the period ended $ 9,000 $ 12,000 $ 29,000 $ 37,000