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Fair Value (Additional Information) (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Loan held for sale, at fair value $ 9,178,000   $ 9,178,000   $ 6,719,000
Contractual principal balance of loan held for sale 9,019,000   9,019,000   6,576,000
Difference in amount of loan held for sale 159,000   159,000   143,000
Impaired loans, carrying amount [1] 7,113,000   7,113,000   9,293,000
Valuation allowance for loans losses 1,624,000   1,624,000   2,234,000
Other real estate carried at fair value less cost to sell 0   0   0
Other real estate, adjustments to carrying value less costs to charged to earnings 0 $ 0 0 $ 0 0
Fair Value, Measurements, Recurring          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Securities 739,980,000   739,980,000   740,994,000
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Securities 5,016,000   5,016,000   6,002,000
Obligations of State and Political Subdivisions          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Gains (losses) included in earnings attributable to other changes in fair value (44,000) 0 (66,000) 34,000  
Obligations of State and Political Subdivisions | Fair Value, Measurements, Recurring          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Securities 284,039,000   284,039,000   273,309,000
Gains (losses) included in earnings attributable to other changes in fair value (44,000) 0 (66,000) 34,000  
Obligations of State and Political Subdivisions | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Securities 4,663,000   4,663,000   5,649,000
Equity Securities | Fair Value, Measurements, Recurring          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Securities 353,000   353,000   353,000
Gains (losses) included in earnings attributable to other changes in fair value 0 0 0 0  
Equity Securities | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Securities 353,000   353,000   353,000
Commercial Real Estate Loans          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Impaired loans, carrying amount 6,751,000   6,751,000   9,020,000
Valuation allowance for loans losses 1,594,000   1,594,000   2,228,000
Increase (decrease) to provision for loan losses $ 190,000 $ 1,583,000 $ (640,000) $ 1,587,000 $ 1,973,000
[1] Unpaid Principal Balance is the remaining contractual principal payments gross of partial charge-offs and discounts.