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, 2019	$ 430,215	$ 205	$ 213,004	$ (22,370)	$ 227,165	$ 12,211
Beginning Balance (ASU 2016-13 [Member]) at Dec. 31, 2019	(594)				(594)
Beginning Balance, Shares at Dec. 31, 2019		20,560,833		(1,258,250)
Comprehensive income:
Net income	10,800				10,800
Other comprehensive income:
Change in unrealized gains, net of tax	1,484					1,484
Comprehensive income	12,284
Common stock issued, Shares		201
Share-based compensation	263		263
Dividends to shareholders	(5,212)				(5,212)
Ending Balance at Mar. 31, 2020	436,956	$ 205	213,267	$ (22,370)	232,159	13,695
Ending Balance, Shares at Mar. 31, 2020		20,561,034		(1,258,250)
Beginning Balance at Dec. 31, 2020	$ 438,816	$ 206	215,316	$ (22,370)	224,645	21,019
Beginning Balance, Shares at Dec. 31, 2020	19,331,059	20,589,309		(1,258,250)
Comprehensive income:
Net income	$ 19,312				19,312
Other comprehensive income:
Change in unrealized gains, net of tax	(5,048)					(5,048)
Comprehensive income	$ 14,264
Common stock issued upon exercise of options, Shares	0
Share-based compensation	$ 152		152
Dividends to shareholders	(5,606)				(5,606)
Ending Balance at Mar. 31, 2021	$ 447,626	$ 206	$ 215,468	$ (22,370)	$ 238,351	$ 15,971
Ending Balance, Shares at Mar. 31, 2021	19,331,059	20,589,309		(1,258,250)