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Fair Value (Additional Information) (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Loans Held-for-Sale, at Fair Value |  | $ 14,184,000 |  | $ 14,184,000 |  | $ 4,263,000
Contractual principal balance of loan held for sale |  | 13,925,000 |  | 13,925,000 |  | 4,231,000
Difference in amount of loan held for sale |  | 259,000 |  | 259,000 |  | 32,000
Impaired loans, carrying amount | [1] | 6,288,000 |  | 6,288,000 |  | 6,757,000
Valuation allowance for loans losses |  | 1,907,000 |  | 1,907,000 |  | 1,826,000
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
90 Days Past Due or Non-accrual |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Loans Held-for-Sale, at Fair Value |  | 0 |  | 0 |  | 0
Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Securities |  | 840,692,000 |  | 840,692,000 |  | 812,611,000
Loans Held-for-Sale, at Fair Value |  | 14,184,000 |  | 14,184,000 |  | 4,263,000
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Securities |  | 4,506,000 |  | 4,506,000 |  | 4,991,000
Loans Held-for-Sale, at Fair Value |  | 0 |  | 0 |  | 0
Obligations of State and Political Subdivisions | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Securities |  | 303,284,000 |  | 303,284,000 |  | 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 |  | 4,506,000 |  | 4,506,000 |  | 4,991,000
Commercial Real Estate Loans |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Impaired loans, carrying amount |  | 5,134,000 |  | 5,134,000 |  | 6,561,000
Valuation allowance for loans losses |  | 1,549,000 |  | 1,549,000 |  | 1,823,000
Increase (decrease) to provision for loan losses |  | $ 123,000 | $ 191,000 | $ (273,000) | $ (856,000) | $ (411,000)
[1] | Unpaid Principal Balance is the remaining contractual payments gross of partial charge-offs and discounts.

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