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Fair Value (Additional Information) (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loan held for sale, at fair value $ 8,586,000 $ 4,263,000
Contractual principal balance of loan held for sale 8,420,000 4,231,000
Difference in amount of loan held for sale 166,000 32,000
Impaired loans, carrying amount [1] 6,772,000 6,757,000
Valuation allowance for loans losses 1,704,000 1,826,000
Other real estate carried at fair value less cost to sell 0 0
Other real estate, adjustments to carrying value less costs to charged to earnings 0 0
90 Days Past Due or Non-accrual    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loan held for sale, at fair value 0 0
Fair Value, Measurements, Recurring    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities 824,597,000 812,611,000
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities 4,512,000 4,991,000
Obligations of State and Political Subdivisions | Fair Value, Measurements, Recurring    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities 292,317,000 294,533,000
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 4,512,000 4,991,000
Commercial Real Estate Loans    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Impaired loans, carrying amount 5,494,000 6,561,000
Valuation allowance for loans losses 1,426,000 1,823,000
Increase (decrease) to provision for loan losses $ 397,000 $ 411,000
[1] Unpaid Principal Balance is the remaining contractual principal payments gross of partial charge-offs and discounts.