Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Basic earnings per common share computation
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 53,405	$ 31,596	$ 40,081
Net earnings allocated to participating securities	(183)	(100)	(147)
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 53,222	$ 31,496	$ 39,934
Weighted average common shares outstanding, including shares considered participating securities (in shares)	16,875	16,048	15,219
Less: Average participating securities (in shares)	(55)	(48)	(55)
Weighted average shares (in shares)	16,820	16,000	15,164
Basic earnings per common share (in dollars per share)	$ 3.16	$ 1.97	$ 2.63
Diluted earnings per common share computation
Net earnings allocated to common stock	$ 53,222	$ 31,496	$ 39,934
Weighted average common shares outstanding for basic earnings per common share (in shares)	16,820	16,000	15,164
Add: Dilutive effects of performance based-shares (in shares)	0	0	0
Weighted average shares and dilutive potential common shares (in shares)	16,820	16,000	15,164
Diluted earnings per common share (in dollars per share)	$ 3.16	$ 1.97	$ 2.63
Distributed earnings allocated to common stock
Basic earnings per common share computation
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 11,514	$ 10,942	$ 10,317
Undistributed earnings allocated to common stock
Basic earnings per common share computation
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 41,708	$ 20,554	$ 29,617