Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income/(Loss)
Balance, beginning, outstanding (in shares) at Dec. 31, 2017		11,609,853
Balance, beginning at Dec. 31, 2017	$ 231,810	$ 116	$ 88,205	$ 143,073	$ 416
Increase (Decrease) in Stockholders' Equity
Net income	28,881			28,881
Other comprehensive income (loss), net	(1,700)				(1,700)
Common stock dividend declared	(6,771)			(6,771)
Common stock issued under dividend reinvestment plan (in shares)		37,999
Common stock issued under dividend reinvestment plan	1,328		1,328
Common stock issued, other (in shares)		3,440
Common stock issued, other	121		121
Stock-based compensation, net (in shares)		51,107
Stock-based compensation, net	1,879	$ 1	1,878
Net settlement for employee taxes on restricted stock and options (in shares)		(15,106)
Net settlement for employee taxes on restricted stock and options	(559)		(559)
Stock options exercised, net (in shares)		20,925
Stock option exercised, net	308		308
Balance, ending, outstanding (in shares) at Dec. 31, 2018		11,708,218
Balance, ending at Dec. 31, 2018	255,297	$ 117	91,281	165,183	(1,284)
Increase (Decrease) in Stockholders' Equity
Net income	34,200			34,200
Other comprehensive income (loss), net	11,794				11,794
Common stock dividend declared	(7,540)			(7,540)
Common stock issued under dividend reinvestment plan (in shares)		39,176
Common stock issued under dividend reinvestment plan	1,169		1,169
Common stock issued, other (in shares)		2,305
Common stock issued, other	69		69
Stock-based compensation, net (in shares)		61,318
Stock-based compensation, net	1,869	$ 1	1,868
Net settlement for employee taxes on restricted stock and options (in shares)		(8,223)
Net settlement for employee taxes on restricted stock and options	(402)		(402)
Stock options exercised, net (in shares)		22,537
Stock option exercised, net	$ 185		185
Balance, ending, outstanding (in shares) at Dec. 31, 2019	11,825,331	11,825,331
Balance, ending at Dec. 31, 2019	$ 296,641	$ 118	94,170	191,843	10,510
Increase (Decrease) in Stockholders' Equity
Net income	31,456			31,456
Other comprehensive income (loss), net	11,683				11,683
Common stock dividend declared	(8,322)			(8,322)
Common stock issued under dividend reinvestment plan (in shares)		50,506
Common stock issued under dividend reinvestment plan	1,217		1,217
Common stock issued, other (in shares)		3,816
Common stock issued, other	91		91
Stock-based compensation, net (in shares)		65,417
Stock-based compensation, net	1,872	$ 1	1,871
Net settlement for employee taxes on restricted stock and options (in shares)		(8,315)
Net settlement for employee taxes on restricted stock and options	(233)		(233)
Stock options exercised, net (in shares)		1,040
Stock option exercised, net	$ 21		21
Balance, ending, outstanding (in shares) at Dec. 31, 2020	11,937,795	11,937,795
Balance, ending at Dec. 31, 2020	$ 334,426	$ 119	$ 97,137	$ 214,977	$ 22,193