Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Total
Beginning balance at Dec. 31, 2019	$ 2	$ 180,012	$ 4,686	$ 33,856	$ 218,556
Beginning balance (in shares) at Dec. 31, 2019	23,468,750
Changes in Stockholders' Equity
Other comprehensive income (loss), net of tax			5,752		5,752
Stock-based compensation		1,457			1,457
Issuance of common stock in stock offerings, net of offering costs	$ 1	125,546			125,547
Issuance of common stock in stock offerings, net of offering costs (in shares)	1,900,000
Issuance of common stock via employee stock purchase plan		741			741
Issuance of common stock via employee stock purchase plan (in shares)	28,367
Issuance of common stock via equity incentive plan		1,740			1,740
Issuance of common stock via equity incentive plan (in shares)	121,840
Net income				8,102	8,102
Ending balance at Sep. 30, 2020	$ 3	309,496	10,438	41,958	361,895
Ending balance (in shares) at Sep. 30, 2020	25,518,957
Beginning balance at Dec. 31, 2020	$ 3	310,507	13,246	39,957	$ 363,713
Beginning balance (in shares) at Dec. 31, 2020	25,525,796				25,525,796
Changes in Stockholders' Equity
Other comprehensive income (loss), net of tax			(5,144)		$ (5,144)
Stock-based compensation		3,370			3,370
Issuance of common stock via employee stock purchase plan		719			$ 719
Issuance of common stock via employee stock purchase plan (in shares)	9,793				9,793
Issuance of common stock via equity incentive plan		1,756			$ 1,756
Issuance of common stock via equity incentive plan (in shares)	118,806
Repurchases of common stock				(15,852)	(15,852)
Repurchases of common stock (in shares)	(239,096)
Net income				29,215	29,215
Ending balance at Sep. 30, 2021	$ 3	$ 316,352	$ 8,102	$ 53,320	$ 377,777
Ending balance (in shares) at Sep. 30, 2021	25,415,299				25,415,299