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Loans and Allowance for Loan Losses - Impaired Loans and Related Allowance (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Recorded investment in impaired loans:    
With no specific allowance recorded $ 3,877,000 $ 4,445,000
With a specific allowance recorded 11,161,000 12,481,000
Total recorded investment in impaired loans 15,038,000 16,926,000
Unpaid principal balance of impaired loans:    
Total unpaid principal balance of impaired loans 15,013,000 17,019,000
Specific valuation 778,000 513,000
Average recorded investment in impaired loans during the period 15,977,000 17,929,000
Interest income recognized on impaired loans 837,000 825,000
Charged-off portion of impaired loans 0 0
Outstanding commitments to extend credit on impaired loans 1,100,000 935,000
Interest income recognized on impaired loans during the period ended, cash basis 135,000,000 100,000,000
Commercial | Commercial and industrial    
Recorded investment in impaired loans:    
With no specific allowance recorded 303,000 309,000
With a specific allowance recorded 1,522,000 1,856,000
Total recorded investment in impaired loans 1,825,000 2,165,000
Unpaid principal balance of impaired loans:    
Total unpaid principal balance of impaired loans 1,813,000 2,278,000
Specific valuation 466,000 50,000
Average recorded investment in impaired loans during the period 1,980,000 2,113,000
Interest income recognized on impaired loans 239,000 202,000
Commercial real estate | Commercial real estate, owner-occupied    
Recorded investment in impaired loans:    
With no specific allowance recorded 0 0
With a specific allowance recorded 6,993,000 6,999,000
Total recorded investment in impaired loans 6,993,000 6,999,000
Unpaid principal balance of impaired loans:    
Total unpaid principal balance of impaired loans 6,993,000 6,993,000
Specific valuation 189,000 188,000
Average recorded investment in impaired loans during the period 7,000,000 6,998,000
Interest income recognized on impaired loans 266,000 266,000
Commercial real estate | Commercial real estate, investor    
Recorded investment in impaired loans:    
With no specific allowance recorded 0 0
With a specific allowance recorded 1,821,000 2,171,000
Total recorded investment in impaired loans 1,821,000 2,171,000
Unpaid principal balance of impaired loans:    
Total unpaid principal balance of impaired loans 1,812,000 2,168,000
Specific valuation 45,000 159,000
Average recorded investment in impaired loans during the period 1,904,000 2,842,000
Interest income recognized on impaired loans 83,000 87,000
Commercial real estate | Construction    
Recorded investment in impaired loans:    
With no specific allowance recorded 2,688,000 2,689,000
With a specific allowance recorded 0 280,000
Total recorded investment in impaired loans 2,688,000 2,969,000
Unpaid principal balance of impaired loans:    
Total unpaid principal balance of impaired loans 2,688,000 2,963,000
Specific valuation 0 7,000
Average recorded investment in impaired loans during the period 2,803,000 3,132,000
Interest income recognized on impaired loans 156,000 147,000
Residential loans | Home equity    
Recorded investment in impaired loans:    
With no specific allowance recorded 313,000 406,000
With a specific allowance recorded 251,000 347,000
Total recorded investment in impaired loans 564,000 753,000
Unpaid principal balance of impaired loans:    
Total unpaid principal balance of impaired loans 562,000 750,000
Specific valuation 5,000 6,000
Average recorded investment in impaired loans during the period 671,000 679,000
Interest income recognized on impaired loans 19,000 24,000
Residential loans | Other residential    
Recorded investment in impaired loans:    
With no specific allowance recorded 462,000 995,000
With a specific allowance recorded 0 153,000
Total recorded investment in impaired loans 462,000 1,148,000
Unpaid principal balance of impaired loans:    
Total unpaid principal balance of impaired loans 461,000 1,147,000
Specific valuation 0 1,000
Average recorded investment in impaired loans during the period 915,000 1,324,000
Interest income recognized on impaired loans 45,000 62,000
Consumer loans | Installment and other consumer    
Recorded investment in impaired loans:    
With no specific allowance recorded 111,000 46,000
With a specific allowance recorded 574,000 675,000
Total recorded investment in impaired loans 685,000 721,000
Unpaid principal balance of impaired loans:    
Total unpaid principal balance of impaired loans 684,000 720,000
Specific valuation 73,000 102,000
Average recorded investment in impaired loans during the period 704,000 841,000
Interest income recognized on impaired loans $ 29,000 $ 37,000