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Loans and Allowance for Loan Losses - Impaired and Related Allowance (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Recorded investment in impaired loans:          
With no specific allowance recorded $ 4,417,000   $ 4,417,000   $ 4,445,000
With a specific allowance recorded 11,462,000   11,462,000   12,481,000
Total recorded investment in impaired loans 15,879,000   15,879,000   16,926,000
Unpaid principal balance of impaired loans 15,842,000   15,842,000   17,019,000
Specific allowance 503,000   503,000   513,000
Average recorded investment in impaired loans during the period 16,213,000 $ 18,353,000 16,438,000 $ 18,340,000  
Interest income recognized on impaired loans during the period ended 177,000 179,000 483,000 362,000  
Interest income recognized on impaired loans during the period ended, cash basis     128,000 0  
Outstanding commitments to extend credit on impaired loans 850,000   850,000   935,000
Commercial loans | Commercial and industrial          
Recorded investment in impaired loans:          
With no specific allowance recorded 306,000   306,000   309,000
With a specific allowance recorded 1,611,000   1,611,000   1,856,000
Total recorded investment in impaired loans 1,917,000   1,917,000   2,165,000
Unpaid principal balance of impaired loans 1,905,000   1,905,000   2,278,000
Specific allowance 232,000   232,000   50,000
Average recorded investment in impaired loans during the period 2,092,000 2,072,000 2,104,000 2,117,000  
Interest income recognized on impaired loans during the period ended 28,000 25,000 183,000 48,000  
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 7,002,000   7,002,000   6,999,000
Total recorded investment in impaired loans 7,002,000   7,002,000   6,999,000
Unpaid principal balance of impaired loans 6,993,000   6,993,000   6,993,000
Specific allowance 126,000   126,000   188,000
Average recorded investment in impaired loans during the period 7,005,000 7,000,000 7,003,000 6,998,000  
Interest income recognized on impaired loans during the period ended 66,000 66,000 132,000 132,000  
Commercial real estate loans | Commercial real estate, investor          
Recorded investment in impaired loans:          
With no specific allowance recorded 0   0   0
With a specific allowance recorded 1,844,000   1,844,000   2,171,000
Total recorded investment in impaired loans 1,844,000   1,844,000   2,171,000
Unpaid principal balance of impaired loans 1,837,000   1,837,000   2,168,000
Specific allowance 47,000   47,000   159,000
Average recorded investment in impaired loans during the period 1,849,000 3,283,000 1,956,000 2,941,000  
Interest income recognized on impaired loans during the period ended 20,000 20,000 42,000 43,000  
Commercial real estate loans | Construction          
Recorded investment in impaired loans:          
With no specific allowance recorded 2,691,000   2,691,000   2,689,000
With a specific allowance recorded 0   0   280,000
Total recorded investment in impaired loans 2,691,000   2,691,000   2,969,000
Unpaid principal balance of impaired loans 2,688,000   2,688,000   2,963,000
Specific allowance 0   0   7,000
Average recorded investment in impaired loans during the period 2,833,000 3,240,000 2,878,000 3,241,000  
Interest income recognized on impaired loans during the period ended 37,000 37,000 75,000 71,000  
Residential loans | Home equity          
Recorded investment in impaired loans:          
With no specific allowance recorded 385,000   385,000   406,000
With a specific allowance recorded 347,000   347,000   347,000
Total recorded investment in impaired loans 732,000   732,000   753,000
Unpaid principal balance of impaired loans 729,000   729,000   750,000
Specific allowance 6,000   6,000   6,000
Average recorded investment in impaired loans during the period 736,000 642,000 742,000 667,000  
Interest income recognized on impaired loans during the period ended 5,000 7,000 10,000 14,000  
Residential loans | Other residential          
Recorded investment in impaired loans:          
With no specific allowance recorded 989,000   989,000   995,000
With a specific allowance recorded 0   0   153,000
Total recorded investment in impaired loans 989,000   989,000   1,148,000
Unpaid principal balance of impaired loans 987,000   987,000   1,147,000
Specific allowance 0   0   1,000
Average recorded investment in impaired loans during the period 990,000 1,173,000 1,043,000 1,437,000  
Interest income recognized on impaired loans during the period ended 13,000 14,000 26,000 34,000  
Consumer loans | Installment and other consumer          
Recorded investment in impaired loans:          
With no specific allowance recorded 46,000   46,000   46,000
With a specific allowance recorded 658,000   658,000   675,000
Total recorded investment in impaired loans 704,000   704,000   721,000
Unpaid principal balance of impaired loans 703,000   703,000   720,000
Specific allowance 92,000   92,000   $ 102,000
Average recorded investment in impaired loans during the period 708,000 943,000 712,000 939,000  
Interest income recognized on impaired loans during the period ended $ 8,000 $ 10,000 $ 15,000 $ 20,000