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Stock-Based Compensation - Restricted Shares (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share based award vesting period	5 years
Shares
Nonvested at the beginning of the period (in shares)	79,560	81,608	72,109
Granted (in shares)	94,654	117,279	149,496
Vested (in shares)	(138,635)	(119,327)	(108,610)
Forfeited or unearned (in shares)	(10,579)	0	(31,387)
Nonvested at the end of the period (in shares)	25,000	79,560	81,608
Weighted-Average Grant-Date Fair Value
Nonvested at the beginning of the period, weighted-average grant-date fair value (in usd per share)	$ 8.08	$ 8.35	$ 7.76
Granted, weighted-average grant-date fair value (in usd per share)	9.03	8.34	9.38
Vested, weighted-average grant-date fair value (in usd per share)	8.91	8.52	9.04
Forfeited or unearned, weighted-average grant-date fair value (in usd per share)	8.99	0	9.55
Nonvested at the end of the period, weighted-average grant-date fair value (in usd per share)	$ 7.23	$ 8.08	$ 8.35
Restricted stock | Class A Non-Voting
Weighted-Average Grant-Date Fair Value
Share-based compensation expense	$ 906,000	$ 942,000	$ 1,205,000
Unearned compensation cost	$ 104,000

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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