Equity - Restricted Stock (Details) - Restricted stock - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended			6 Months Ended
	Feb. 13, 2020	Jan. 08, 2020	Jan. 07, 2019	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jan. 01, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	4 years	4 years
Shares
Unvested at beginning of period (in shares)					193,045		193,045	190,462
Granted (in shares)					110,830		75,419
Vested (in shares)				0	(101,109)	0	(78,010)	(78,431)
Forfeited (in shares)					(7,138)		(858)
Unvested at end of period (in shares)				189,596			189,596
Fair value of restricted stock per share at grant date	$ 32.64	$ 31.49	$ 24.85				$ 31.60
Stock Repurchased and Retired During Period, Shares					28,504		33,119
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value				$ 27.77			$ 27.77		$ 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							23.11
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value							$ 24.85
Unrecognized compensation costs				$ 4,200			$ 4,200
Unrecognized compensation costs, period for recognition							2 years 8 months 12 days
Vested (in shares)				0	(101,109)	0	(78,010)	(78,431)
Fair value of shares vested				$ 0		$ 0	$ 2,463	$ 1,951