Earnings Per Share - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Basic
Net income available to common shareholders	$ 21,342	$ 24,230	$ 69,799	$ 53,610
Less: income attributable to unvested stock-based compensation awards	(154)	(278)	(504)	(628)
Net earnings allocated to common shareholders	$ 21,188	$ 23,952	$ 69,295	$ 52,982
Weighted average shares outstanding, including unvested stock-based compensation awards (in shares)	14,724,141	14,920,924	14,840,420	14,929,628
Less: unvested stock-based compensation awards (in shares)	(229,608)	(223,392)	(232,538)	(230,181)
Weighted average shares outstanding - Basic (in shares)	14,494,533	14,697,532	14,607,882	14,699,447
Diluted
Net earnings allocated to common shareholders	$ 21,188	$ 23,952	$ 69,295	$ 52,982
Weighted average shares outstanding - Basic (in shares)	14,494,533	14,697,532	14,607,882	14,699,447
Plus: Incremental shares from assumed conversion of stock-based compensation awards (in shares)	73,801	30,209	79,303	39,474
Weighted average shares outstanding - Diluted (in shares)	14,568,334	14,727,741	14,687,185	14,738,921
Basic EPS (in dollars per share)	$ 1.46	$ 1.63	$ 4.74	$ 3.60
Diluted EPS (in dollars per share)	$ 1.45	$ 1.63	$ 4.72	$ 3.59