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Stock-Based Compensation (Details) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
	Aug. 19, 2019 Officer	Sep. 30, 2021 USD ($) $ / shares shares	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) $ / shares shares	Sep. 30, 2020 USD ($)	May 02, 2016 shares
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)				6,682
Granted (in shares)				6,170
Vested (in shares)				(4,048)
Forfeited (in shares)				0
Nonvested at end of the period (in shares)		8,804		8,804
Grant Date Weighted Average Fair Value [Abstract]
Nonvested at beginning of the period (in dollars per share) | $ / shares				$ 39.30
Granted (in dollars per share) | $ / shares				51.40
Vested (in dollars per share) | $ / shares				41.19
Forfeited (in dollars per share) | $ / shares				0
Nonvested at end of the period (in dollars per share) | $ / shares		$ 46.91		$ 46.91
Stock-Based Compensation Expense [Abstract]
Stock-based compensation expense | $		$ 46	$ 74	$ 167	$ 126
Recognized tax benefits related to stock-based compensation expense | $		13	$ 21	48	$ 36
Fair value of vested shares | $				167
Stock-based compensation expense not yet recognized | $		$ 413		$ 413
Period of recognition				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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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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