Common Stock Incentive Plan - Restricted Stock Narrative (Details) - Restricted stock - USD ($) $ in Millions	1 Months Ended		12 Months Ended
	Nov. 30, 2021	May 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Common Stock Incentive Plan
Shares granted			133,052	103,473	87,327
Remaining unamortized share-based compensation expense			$ 9.2
Directors
Common Stock Incentive Plan
Shares granted	8,000	36,000
Directors | Three-year vesting period
Common Stock Incentive Plan
Vesting rights percentage			33.33%
Vesting period (in years)	3 years	3 years	3 years
Shares granted		12,000
Directors | Three-year vesting period | Maximum
Common Stock Incentive Plan
Service period as basis for restricted stock award vesting (in years)			6 years
Directors | Two-year vesting period
Common Stock Incentive Plan
Service period as basis for restricted stock award vesting (in years)			6 years
Vesting rights percentage			50.00%
Vesting period (in years)			2 years
Directors | One-year vesting period
Common Stock Incentive Plan
Service period as basis for restricted stock award vesting (in years)			7 years
Vesting rights percentage			100.00%
Vesting period (in years)			1 year
Directors | Immediate vesting
Common Stock Incentive Plan
Shares granted		24,000
Directors | Immediate vesting | Minimum
Common Stock Incentive Plan
Service period as basis for restricted stock award vesting (in years)			8 years
Employees
Common Stock Incentive Plan
Vesting period (in years)			4 years
Shares granted			89,052