Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Accumulated Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance at Dec. 31, 2020	$ 438,816	$ 206	$ 215,316	$ (22,370)	$ 224,645	$ 21,019
Beginning Balance, Shares at Dec. 31, 2020		20,589,309		(1,258,250)
Comprehensive income:
Net income	62,215				62,215
Other comprehensive income:
Change in unrealized gains (losses) on debt securities, net of tax	(6,033)					(6,033)
Comprehensive income	56,182
Common stock issued	$ 1,563		1,563
Common stock issued, Shares		32,995
Purchase of treasury stock, Shares	0
Share-based compensation	$ 432		432
Dividends to shareholders	(16,837)				(16,837)
Ending Balance at Sep. 30, 2021	480,156	$ 206	217,311	$ (22,370)	270,023	14,986
Ending Balance, Shares at Sep. 30, 2021		20,622,304		(1,258,250)
Beginning Balance at Jun. 30, 2021	468,366	$ 206	217,165	$ (22,370)	256,503	16,862
Beginning Balance, Shares at Jun. 30, 2021		20,622,304		(1,258,250)
Comprehensive income:
Net income	19,136				19,136
Other comprehensive income:
Change in unrealized gains (losses) on debt securities, net of tax	(1,876)					(1,876)
Comprehensive income	$ 17,260
Purchase of treasury stock, Shares	0
Share-based compensation	$ 146		146
Dividends to shareholders	(5,616)				(5,616)
Ending Balance at Sep. 30, 2021	480,156	$ 206	217,311	$ (22,370)	270,023	14,986
Ending Balance, Shares at Sep. 30, 2021		20,622,304		(1,258,250)
Beginning Balance at Dec. 31, 2021	$ 399,323	$ 206	217,458	$ (22,370)	190,492	13,537
Beginning Balance, Shares at Dec. 31, 2021	19,364,054	20,622,304		(1,258,250)
Comprehensive income:
Net income	$ 34,824				34,824
Other comprehensive income:
Change in unrealized gains (losses) on debt securities, net of tax	(33,501)					(33,501)
Comprehensive income	1,323
Common stock issued	1,970	$ 1	1,969
Common stock issued, Shares		56,268
Purchase of treasury stock	$ (12,236)			$ (12,236)
Purchase of treasury stock, Shares	(261,151)			(261,151)
Share-based compensation	$ 561		561
Dividends to shareholders	(17,922)				(17,922)
Ending Balance at Sep. 30, 2022	$ 373,019	$ 207	219,988	$ (34,606)	207,394	(19,964)
Ending Balance, Shares at Sep. 30, 2022	19,159,171	20,678,572		(1,519,401)
Beginning Balance at Jun. 30, 2022	$ 384,989	$ 207	219,744	$ (28,071)	201,983	(8,874)
Beginning Balance, Shares at Jun. 30, 2022		20,676,474		(1,379,842)
Comprehensive income:
Net income	11,361				11,361
Other comprehensive income:
Change in unrealized gains (losses) on debt securities, net of tax	(11,090)					(11,090)
Comprehensive income	271
Common stock issued, Shares		2,098
Purchase of treasury stock	$ (6,535)			$ (6,535)
Purchase of treasury stock, Shares	(139,559)			(139,559)
Share-based compensation	$ 244		244
Dividends to shareholders	(5,950)				(5,950)
Ending Balance at Sep. 30, 2022	$ 373,019	$ 207	$ 219,988	$ (34,606)	$ 207,394	$ (19,964)
Ending Balance, Shares at Sep. 30, 2022	19,159,171	20,678,572		(1,519,401)