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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Recorded investment in impaired loans:          
With no specific allowance recorded $ 5,347,000   $ 5,347,000   $ 12,928,000
With a specific allowance recorded 14,310,000   14,310,000   8,260,000
Total recorded investment in impaired loans 19,657,000   19,657,000   21,188,000
Unpaid principal balance of impaired loans:          
Total unpaid principal balance of impaired loans 19,657,000   19,657,000   23,409,000
Specific valuation 1,343,000   1,343,000   1,169,000
Average recorded investment in impaired loans during the period 21,139,000 $ 22,390,000 21,788,000 $ 23,921,000  
Interest income recognized on impaired loans during the period ended 1,600,000 217,000 2,021,000 602,000  
Interest income recognized on impaired loans during the period ended, cash basis 1,400,000 0 1,400,000 0  
Charged-off portion of impaired loans         2,100,000
Outstanding commitments to extend credit on impaired loans 1,300,000   1,300,000    
Commercial loans | Commercial and industrial          
Recorded investment in impaired loans:          
With no specific allowance recorded 1,102,000   1,102,000   2,198,000
With a specific allowance recorded 1,906,000   1,906,000   2,522,000
Total recorded investment in impaired loans 3,008,000   3,008,000   4,720,000
Unpaid principal balance of impaired loans:          
Total unpaid principal balance of impaired loans 3,008,000   3,008,000   4,763,000
Specific valuation 569,000   569,000   912,000
Average recorded investment in impaired loans during the period 3,352,000 4,473,000 3,802,000 4,121,000  
Interest income recognized on impaired loans during the period ended 44,000 58,000 142,000 176,000  
Commercial real estate loans | Commercial real estate, owner-occupied          
Recorded investment in impaired loans:          
With no specific allowance recorded 0   0   4,111,000
With a specific allowance recorded 7,169,000   7,169,000   2,882,000
Total recorded investment in impaired loans 7,169,000   7,169,000   6,993,000
Unpaid principal balance of impaired loans:          
Total unpaid principal balance of impaired loans 7,169,000   7,169,000   6,993,000
Specific valuation 108,000   108,000   70,000
Average recorded investment in impaired loans during the period 7,169,000 7,695,000 7,081,000 8,183,000  
Interest income recognized on impaired loans during the period ended 67,000 84,000 133,000 228,000  
Commercial real estate loans | Commercial real estate, investor          
Recorded investment in impaired loans:          
With no specific allowance recorded 0   0   2,416,000
With a specific allowance recorded 2,299,000   2,299,000   0
Total recorded investment in impaired loans 2,299,000   2,299,000   2,416,000
Unpaid principal balance of impaired loans:          
Total unpaid principal balance of impaired loans 2,299,000   2,299,000   4,408,000
Specific valuation 474,000   474,000   0
Average recorded investment in impaired loans during the period 3,146,000 2,886,000 3,397,000 2,916,000  
Interest income recognized on impaired loans during the period ended 1,385,000 10,000 1,489,000 24,000  
Commercial real estate loans | Construction          
Recorded investment in impaired loans:          
With no specific allowance recorded 2,688,000   2,688,000   2,687,000
With a specific allowance recorded 550,000   550,000   551,000
Total recorded investment in impaired loans 3,238,000   3,238,000   3,238,000
Unpaid principal balance of impaired loans:          
Total unpaid principal balance of impaired loans 3,238,000   3,238,000   3,424,000
Specific valuation 5,000   5,000   1,000
Average recorded investment in impaired loans during the period 3,238,000 3,262,000 3,238,000 4,473,000  
Interest income recognized on impaired loans during the period ended 32,000 22,000 105,000 40,000  
Residential loans | Home equity          
Recorded investment in impaired loans:          
With no specific allowance recorded 260,000   260,000   171,000
With a specific allowance recorded 625,000   625,000   388,000
Total recorded investment in impaired loans 885,000   885,000   559,000
Unpaid principal balance of impaired loans:          
Total unpaid principal balance of impaired loans 885,000   885,000   559,000
Specific valuation 34,000   34,000   3,000
Average recorded investment in impaired loans during the period 1,140,000 610,000 1,098,000 616,000  
Interest income recognized on impaired loans during the period ended 38,000 5,000 48,000 14,000  
Residential loans | Other residential          
Recorded investment in impaired loans:          
With no specific allowance recorded 1,189,000   1,189,000   1,214,000
With a specific allowance recorded 785,000   785,000   797,000
Total recorded investment in impaired loans 1,974,000   1,974,000   2,011,000
Unpaid principal balance of impaired loans:          
Total unpaid principal balance of impaired loans 1,974,000   1,974,000   2,011,000
Specific valuation 59,000   59,000   67,000
Average recorded investment in impaired loans during the period 1,981,000 2,025,000 1,993,000 2,033,000  
Interest income recognized on impaired loans during the period ended 22,000 23,000 67,000 69,000  
Consumer loans | Installment and other consumer          
Recorded investment in impaired loans:          
With no specific allowance recorded 108,000   108,000   131,000
With a specific allowance recorded 976,000   976,000   1,120,000
Total recorded investment in impaired loans 1,084,000   1,084,000   1,251,000
Unpaid principal balance of impaired loans:          
Total unpaid principal balance of impaired loans 1,084,000   1,084,000   1,251,000
Specific valuation 94,000   94,000   $ 116,000
Average recorded investment in impaired loans during the period 1,113,000 1,439,000 1,179,000 1,579,000  
Interest income recognized on impaired loans during the period ended $ 12,000 $ 15,000 $ 37,000 $ 51,000