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Stock-Based Compensation - Restricted Shares (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
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)	81,608	72,109	112,219
Granted (in shares)	117,279	149,496	112,502
Vested (in shares)	(119,327)	(108,610)	(131,260)
Forfeited or unearned (in shares)		(31,387)	(21,352)
Nonvested at the end of the period (in shares)	79,560	81,608	72,109
Weighted-Average Grant-Date Fair Value
Nonvested at the beginning of the period, weighted-average grant-date fair value (in usd per share)	$ 8.35	$ 7.76	$ 7.89
Granted, weighted-average grant-date fair value (in usd per share)	8.34	9.38	7.81
Vested, weighted-average grant-date fair value (in usd per share)	8.52	9.04	8.27
Forfeited or unearned, weighted-average grant-date fair value (in usd per share)		9.55	8.43
Nonvested at the end of the period, weighted-average grant-date fair value (in usd per share)	$ 8.08	$ 8.35	$ 7.76
Restricted stock | Class A Non-Voting
Weighted-Average Grant-Date Fair Value
Share-based compensation expense	$ 942,000	$ 1,205,000	$ 1,176,000
Unearned compensation cost	$ 214,000

X

- Definition

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

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