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Loans and Allowance for Loan Losses - Impaired Loans and Related Allowance (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Recorded investment in impaired loans:      
With no specific allowance recorded $ 4,209,000 $ 12,928,000  
With a specific allowance recorded 14,104,000 8,260,000  
Total recorded investment in impaired loans 18,313,000 21,188,000  
Unpaid principal balance of impaired loans:      
Total unpaid principal balance of impaired loans 18,270,000 23,409,000  
Specific valuation 991,000 1,169,000  
Average recorded investment in impaired loans during the period 20,835,000 23,273,000 $ 25,909,000
Interest income recognized on impaired loans 2,223,000 826,000 948,000
Charged-off portion of impaired loans 0 2,100,000  
Outstanding commitments to extend credit on impaired loans 1,600,000 1,300,000  
Interest income recognized on impaired loans during the period ended, cash basis 1,400,000 0 0
Commercial loans | Commercial and industrial      
Recorded investment in impaired loans:      
With no specific allowance recorded 315,000 2,198,000  
With a specific allowance recorded 1,892,000 2,522,000  
Total recorded investment in impaired loans 2,207,000 4,720,000  
Unpaid principal balance of impaired loans:      
Total unpaid principal balance of impaired loans 2,177,000 4,763,000  
Specific valuation 285,000 912,000  
Average recorded investment in impaired loans during the period 3,514,000 4,237,000 5,354,000
Interest income recognized on impaired loans 175,000 238,000 378,000
Commercial real estate loans | Commercial real estate, owner-occupied      
Recorded investment in impaired loans:      
With no specific allowance recorded 0 4,111,000  
With a specific allowance recorded 6,993,000 2,882,000  
Total recorded investment in impaired loans 6,993,000 6,993,000  
Unpaid principal balance of impaired loans:      
Total unpaid principal balance of impaired loans 6,993,000 6,993,000  
Specific valuation 163,000 70,000  
Average recorded investment in impaired loans during the period 7,069,000 7,886,000 6,604,000
Interest income recognized on impaired loans 199,000 295,000 288,000
Commercial real estate loans | Commercial real estate, investor      
Recorded investment in impaired loans:      
With no specific allowance recorded 0 2,416,000  
With a specific allowance recorded 2,256,000 0  
Total recorded investment in impaired loans 2,256,000 2,416,000  
Unpaid principal balance of impaired loans:      
Total unpaid principal balance of impaired loans 2,252,000 4,408,000  
Specific valuation 375,000 0  
Average recorded investment in impaired loans during the period 2,950,000 2,833,000 3,138,000
Interest income recognized on impaired loans 1,514,000 33,000 28,000
Commercial real estate loans | Construction      
Recorded investment in impaired loans:      
With no specific allowance recorded 2,692,000 2,687,000  
With a specific allowance recorded 553,000 551,000  
Total recorded investment in impaired loans 3,245,000 3,238,000  
Unpaid principal balance of impaired loans:      
Total unpaid principal balance of impaired loans 3,238,000 3,424,000  
Specific valuation 8,000 1,000  
Average recorded investment in impaired loans during the period 3,242,000 4,164,000 6,471,000
Interest income recognized on impaired loans 137,000 86,000 85,000
Residential loans | Home equity      
Recorded investment in impaired loans:      
With no specific allowance recorded 91,000 171,000  
With a specific allowance recorded 624,000 388,000  
Total recorded investment in impaired loans 715,000 559,000  
Unpaid principal balance of impaired loans:      
Total unpaid principal balance of impaired loans 713,000 559,000  
Specific valuation 7,000 3,000  
Average recorded investment in impaired loans during the period 945,000 602,000 741,000
Interest income recognized on impaired loans 60,000 18,000 19,000
Residential loans | Other residential      
Recorded investment in impaired loans:      
With no specific allowance recorded 1,008,000 1,214,000  
With a specific allowance recorded 957,000 797,000  
Total recorded investment in impaired loans 1,965,000 2,011,000  
Unpaid principal balance of impaired loans:      
Total unpaid principal balance of impaired loans 1,965,000 2,011,000  
Specific valuation 55,000 67,000  
Average recorded investment in impaired loans during the period 1,988,000 2,028,000 1,744,000
Interest income recognized on impaired loans 90,000 92,000 74,000
Consumer loans | Installment and other consumer      
Recorded investment in impaired loans:      
With no specific allowance recorded 103,000 131,000  
With a specific allowance recorded 829,000 1,120,000  
Total recorded investment in impaired loans 932,000 1,251,000  
Unpaid principal balance of impaired loans:      
Total unpaid principal balance of impaired loans 932,000 1,251,000  
Specific valuation 98,000 116,000  
Average recorded investment in impaired loans during the period 1,127,000 1,523,000 1,857,000
Interest income recognized on impaired loans $ 48,000 $ 64,000 $ 76,000