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Stock Based Compensation (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) Officer $ / shares shares	Dec. 31, 2018 Officer $ / shares shares	May 02, 2016 shares
Stock-Based Compensation [Abstract]
Number of retiring officers receiving accelerated vesting period | Officer		1	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
LTIP [Member] | Restricted Stock [Member]
Number of Shares [Roll Forward]
Nonvested at beginning of the year (in shares)	7,342	3,080
Granted (in shares)	4,912	6,963
Vested (in shares)	(5,491)	(2,701)
Forfeited (in shares)	(81)	0
Nonvested at end of the year (in shares)	6,682	7,342	3,080
Grant Date Weighted Average Fair Value [Abstract]
Nonvested at beginning of the year (in dollars per share) | $ / shares	$ 33.57	$ 33.85
Granted (in dollars per share) | $ / shares	44.07	33.61
Vested (in dollars per share) | $ / shares	36.00	33.99
Forfeited (in dollars per share) | $ / shares	33.61	0
Nonvested at end of the year (in dollars per share) | $ / shares	$ 39.30	$ 33.57	$ 33.85
Stock-Based Compensation Expense [Abstract]
Stock-based compensation expense | $	$ 154	$ 166
Recognized tax benefits related to stock-based compensation expense | $	45	48
Fair value of vested shares | $	198	$ 92
Stock-based compensation expense not yet recognized | $	$ 263
Period of recognition	3 years
LTIP [Member] | Restricted Stock [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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