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Equity - Restricted Stock (Details) - Restricted stock - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended			6 Months Ended		12 Months Ended
	Jan. 07, 2021	Feb. 13, 2020	Jan. 08, 2020	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	4 years
Shares
Unvested at beginning of period (in shares)					184,890		184,890	193,045	193,045
Granted (in shares)					75,419		90,304
Vested (in shares)				0	(81,408)	0	(72,788)	(78,010)
Forfeited (in shares)					(2,166)		(521)
Unvested at end of period (in shares)				201,885			201,885		184,890
Fair value of restricted stock per share at grant date	$ 29.77	$ 32.64	$ 31.49				$ 29.77		$ 31.60
Stock Repurchased and Retired During Period, Shares					34,117		25,840
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value				$ 28.96			$ 28.96		27.70	$ 24.38
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value							$ 26.76		23.46
Unrecognized compensation costs				$ 4,400			$ 4,400
Unrecognized compensation costs, period for recognition							2 years 7 months 6 days
Vested (in shares)				0	(81,408)	0	(72,788)	(78,010)
Fair value of shares vested				$ 0		$ 0	$ 2,280	$ 2,463
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value							$ 28.06		$ 26.92

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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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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Number of shares that have been repurchased and retired during the period.

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