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Fair Value (Additional Information) (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Impaired loans, carrying amount | [1] |  |  |  |  | $ 7,229,000
Valuation allowance for impaired loans |  |  |  |  |  | 3,371,000
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 |  | 1,036,910,000 |  | 1,036,910,000 |  | 854,825,000
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Securities |  | 497,000 |  | 497,000 |  | 4,021,000
Loans Held-for-sale |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Gains/(losses) from changes in fair value included in earnings |  | 233,000 | 112,000 | 330,000 | 339,000 |
Obligations of State and Political Subdivisions | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Securities |  | 514,012,000 |  | 514,012,000 |  | 324,300,000
Gains/(losses) from changes in fair value included in other comprehensive income |  | (3,000) | $ (1,000) | (26,000) | $ (16,000) |
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 |  | 497,000 |  | 497,000 |  | 4,021,000
Collateral-dependent loans |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Impaired loans, carrying amount |  | 22,621,000 |  | 22,621,000 |  | 5,574,000
Valuation allowance for impaired loans |  | 7,344,000 |  | 7,344,000 |  | 2,971,000
Collateral-dependent loans | Individually Analyzed Loans |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Increase (decrease) in allowance for loan losses |  | $ 136,000 |  | $ 1,822,000 |  | $ (1,149,000)
[1] | Unpaid Principal Balance is the remaining contractual payments gross of partial charge-offs and discounts.

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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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