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Loans and Allowance for Loan Losses - Impaired Loans and Related Allowance (Details) - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Recorded investment in impaired loans:      
With no specific allowance recorded $ 5,442,000   $ 4,209,000
With a specific allowance recorded 13,013,000   14,104,000
Total recorded investment in impaired loans 18,455,000   18,313,000
Unpaid principal balance of impaired loans:      
Total unpaid principal balance of impaired loans 18,436,000   18,270,000
Specific valuation 673,000   991,000
Average recorded investment in impaired loans during the period 18,384,000 $ 21,754,000  
Interest income recognized on impaired loans during the period ended 183,000 217,000  
Interest income recognized on impaired loans during the period ended, cash basis   0  
Outstanding commitments to extend credit on impaired loans 1,300,000   1,600,000
Commercial loans | Commercial and industrial      
Recorded investment in impaired loans:      
With no specific allowance recorded 314,000   315,000
With a specific allowance recorded 1,756,000   1,892,000
Total recorded investment in impaired loans 2,070,000   2,207,000
Unpaid principal balance of impaired loans:      
Total unpaid principal balance of impaired loans 2,054,000   2,177,000
Specific valuation 28,000   285,000
Average recorded investment in impaired loans during the period 2,138,000 4,283,000  
Interest income recognized on impaired loans during the period ended 23,000 57,000  
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 7,001,000   6,993,000
Total recorded investment in impaired loans 7,001,000   6,993,000
Unpaid principal balance of impaired loans:      
Total unpaid principal balance of impaired loans 6,993,000   6,993,000
Specific valuation 157,000   163,000
Average recorded investment in impaired loans during the period 6,997,000 6,993,000  
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 1,076,000   0
With a specific allowance recorded 2,235,000   2,256,000
Total recorded investment in impaired loans 3,311,000   2,256,000
Unpaid principal balance of impaired loans:      
Total unpaid principal balance of impaired loans 3,323,000   2,252,000
Specific valuation 374,000   375,000
Average recorded investment in impaired loans during the period 2,783,000 3,129,000  
Interest income recognized on impaired loans during the period ended 23,000 16,000  
Commercial real estate loans | Construction      
Recorded investment in impaired loans:      
With no specific allowance recorded 2,690,000   2,692,000
With a specific allowance recorded 551,000   553,000
Total recorded investment in impaired loans 3,241,000   3,245,000
Unpaid principal balance of impaired loans:      
Total unpaid principal balance of impaired loans 3,238,000   3,238,000
Specific valuation 6,000   8,000
Average recorded investment in impaired loans during the period 3,243,000 3,238,000  
Interest income recognized on impaired loans during the period ended 34,000 38,000  
Residential loans | Home equity      
Recorded investment in impaired loans:      
With no specific allowance recorded 88,000   91,000
With a specific allowance recorded 623,000   624,000
Total recorded investment in impaired loans 711,000   715,000
Unpaid principal balance of impaired loans:      
Total unpaid principal balance of impaired loans 708,000   713,000
Specific valuation 10,000   7,000
Average recorded investment in impaired loans during the period 713,000 868,000  
Interest income recognized on impaired loans during the period ended 8,000 4,000  
Residential loans | Other residential      
Recorded investment in impaired loans:      
With no specific allowance recorded 1,175,000   1,008,000
With a specific allowance recorded 0   957,000
Total recorded investment in impaired loans 1,175,000   1,965,000
Unpaid principal balance of impaired loans:      
Total unpaid principal balance of impaired loans 1,174,000   1,965,000
Specific valuation 0   55,000
Average recorded investment in impaired loans during the period 1,571,000 2,004,000  
Interest income recognized on impaired loans during the period ended 19,000 23,000  
Consumer loans | Installment and other consumer      
Recorded investment in impaired loans:      
With no specific allowance recorded 99,000   103,000
With a specific allowance recorded 847,000   829,000
Total recorded investment in impaired loans 946,000   932,000
Unpaid principal balance of impaired loans:      
Total unpaid principal balance of impaired loans 946,000   932,000
Specific valuation 98,000   $ 98,000
Average recorded investment in impaired loans during the period 939,000 1,239,000  
Interest income recognized on impaired loans during the period ended $ 10,000 $ 13,000