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Stock-Based Compensation (Details) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 19, 2019 Officer | Nov. 20, 2018 Officer | Sep. 30, 2020 USD ($) $ / shares shares | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) $ / shares shares | Sep. 30, 2019 USD ($) | May 02, 2016 shares
Officer Retiring in 2019 [Member] |  |  |  |  |  |  |
Stock-Based Compensation [Abstract] |  |  |  |  |  |  |
Number of retiring officers receiving accelerated vesting period | Officer |  | 1 |  |  |  |  |
Officer Retiring in 2020 [Member] |  |  |  |  |  |  |
Stock-Based Compensation [Abstract] |  |  |  |  |  |  |
Number of retiring officers receiving accelerated vesting period | Officer | 1 |  |  |  |  |  |
LTIP [Member] |  |  |  |  |  |  |
Stock-Based Compensation [Abstract] |  |  |  |  |  |  |
Maximum number of shares of common stock that can be issued under the plan (in shares) |  |  |  |  |  |  | 100,000
Term of plan |  |  |  |  | 10 years |  |
Maximum number of shares of common stock subject to awards that may be granted to a participant per calendar year (in shares) |  |  |  |  | 2,000 |  |
Restricted Stock [Member] | LTIP [Member] |  |  |  |  |  |  |
Number of Shares [Roll Forward] |  |  |  |  |  |  |
Nonvested at beginning of the period (in shares) |  |  |  |  | 7,342 |  |
Granted (in shares) |  |  |  |  | 4,912 |  |
Vested (in shares) |  |  |  |  | (5,491) |  |
Forfeited (in shares) |  |  |  |  | (82) |  |
Nonvested at end of the period (in shares) |  |  | 6,681 |  | 6,681 |  |
Grant Date Weighted Average Fair Value [Abstract] |  |  |  |  |  |  |
Nonvested at beginning of the period (in dollars per share) | $ / shares |  |  |  |  | $ 33.57 |  |
Granted (in dollars per share) | $ / shares |  |  |  |  | 44.07 |  |
Vested (in dollars per share) | $ / shares |  |  |  |  | 36.00 |  |
Forfeited (in dollars per share) | $ / shares |  |  |  |  | 33.61 |  |
Nonvested at end of the period (in dollars per share) | $ / shares |  |  | $ 39.30 |  | $ 39.30 |  |
Stock-Based Compensation Expense [Abstract] |  |  |  |  |  |  |
Stock-based compensation expense | $ |  |  | $ 74 | $ 40 | $ 126 | $ 119 |
Recognized tax benefits related to stock-based compensation expense | $ |  |  | 21 | $ 12 | 36 | $ 35 |
Fair value of vested shares | $ |  |  |  |  | 198 |  |
Stock-based compensation expense not yet recognized | $ |  |  | $ 263 |  | $ 263 |  |
Period of recognition |  |  |  |  | 3 years |  |
Restricted Stock [Member] | LTIP [Member] | Officer Retiring in 2019 [Member] |  |  |  |  |  |  |
Stock-Based Compensation [Abstract] |  |  |  |  |  |  |
Vesting period |  |  |  |  | 3 years |  |
Restricted Stock [Member] | LTIP [Member] | Officer Retiring in 2020 [Member] |  |  |  |  |  |  |
Stock-Based Compensation [Abstract] |  |  |  |  |  |  |
Vesting period |  |  |  |  | 3 years |  |
Restricted Stock [Member] | LTIP [Member] | Officers and Key Employees [Member] |  |  |  |  |  |  |
Stock-Based Compensation [Abstract] |  |  |  |  |  |  |
Vesting period |  |  |  |  | 3 years |  |

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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