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	34,748				34,748
Other comprehensive income:
Change in unrealized gains (losses), net of tax	6,967					6,967
Comprehensive income	41,715
Unrealized gain (loss) on debt securities, net of tax	6,967					6,967
Common stock issued	1,360	$ 1	1,359
Common stock issued, Shares		28,476
Share-based compensation	531		531
Dividends to shareholders	(10,431)				(10,431)
Ending Balance at Jun. 30, 2020	462,796	$ 206	214,894	$ (22,370)	250,888	19,178
Ending Balance, Shares at Jun. 30, 2020		20,589,309		(1,258,250)
Beginning Balance at Mar. 31, 2020	436,956	$ 205	213,267	$ (22,370)	232,159	13,695
Beginning Balance, Shares at Mar. 31, 2020		20,561,034		(1,258,250)
Comprehensive income:
Net income	23,948				23,948
Other comprehensive income:
Change in unrealized gains (losses), net of tax	5,483					5,483
Comprehensive income	29,431
Unrealized gain (loss) on debt securities, net of tax	5,483					5,483
Common stock issued	1,360	$ 1	1,359
Common stock issued, Shares		28,275
Share-based compensation	268		268
Dividends to shareholders	(5,219)				(5,219)
Ending Balance at Jun. 30, 2020	462,796	$ 206	214,894	$ (22,370)	250,888	19,178
Ending Balance, Shares at Jun. 30, 2020		20,589,309		(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	$ 43,079				43,079
Other comprehensive income:
Change in unrealized gains (losses), net of tax	(4,157)					(4,157)
Comprehensive income	38,922
Unrealized gain (loss) on debt securities, net of tax	(4,157)					(4,157)
Common stock issued	1,563		1,563
Common stock issued, Shares		32,995
Share-based compensation	286		286
Dividends to shareholders	(11,221)				(11,221)
Ending Balance at Jun. 30, 2021	$ 468,366	$ 206	217,165	$ (22,370)	256,503	16,862
Ending Balance, Shares at Jun. 30, 2021	19,364,054	20,622,304		(1,258,250)
Beginning Balance at Mar. 31, 2021	$ 447,626	$ 206	215,468	$ (22,370)	238,351	15,971
Beginning Balance, Shares at Mar. 31, 2021		20,589,309		(1,258,250)
Comprehensive income:
Net income	23,767				23,767
Other comprehensive income:
Change in unrealized gains (losses), net of tax	891					891
Comprehensive income	24,658
Unrealized gain (loss) on debt securities, net of tax	891					891
Common stock issued	1,563	$ 32,995	1,563
Share-based compensation	134		134
Dividends to shareholders	(5,615)				(5,615)
Ending Balance at Jun. 30, 2021	$ 468,366	$ 206	$ 217,165	$ (22,370)	$ 256,503	$ 16,862
Ending Balance, Shares at Jun. 30, 2021	19,364,054	20,622,304		(1,258,250)