CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Common stock [Member]	Preferred stock [Member]	Nonvested restricted stock [Member]	Additional paid-in capital [Member]	Accumulated other comprehensive income (loss) [Member]	Retained earnings [Member]	Total
Balance at Dec. 31, 2019	$ 77		$ (803)	$ 106,152	$ (298)	$ 100,732	$ 205,860
Balance, shares at Dec. 31, 2019	7,672,678
Net income						9,727	9,727
Proceeds from exercise of stock options				963			963
Proceeds from exercise of stock options, shares	52,716
Issuance of restricted stock			(494)	494
Issuance of restricted stock, shares	12,200
Compensation expense related to restricted stock, net of tax			308				308
Compensation expense related to stock options, net of tax				728			728
Other comprehensive income (loss)					1,163		1,163
Balance at Sep. 30, 2020	$ 77		(989)	108,337	865	110,459	218,749
Balance, shares at Sep. 30, 2020	7,737,594
Balance at Jun. 30, 2020	$ 77		(1,001)	108,031	805	108,242	216,154
Balance, shares at Jun. 30, 2020	7,734,644
Net income						2,217	2,217
Proceeds from exercise of stock options				1			1
Proceeds from exercise of stock options, shares	250
Issuance of restricted stock			(88)	88
Issuance of restricted stock, shares	2,700
Compensation expense related to restricted stock, net of tax			100				100
Compensation expense related to stock options, net of tax				217			217
Other comprehensive income (loss)					60		60
Balance at Sep. 30, 2020	$ 77		(989)	108,337	865	110,459	218,749
Balance, shares at Sep. 30, 2020	7,737,594
Balance at Dec. 31, 2020	$ 78		(698)	108,831	1,023	119,060	228,294
Balance, shares at Dec. 31, 2020	7,772,748
Net income						34,706	34,706
Proceeds from exercise of stock options	$ 1			2,695			2,696
Proceeds from exercise of stock options, shares	117,383
Issuance of restricted stock			(1,120)	1,120
Issuance of restricted stock, shares	23,250
Compensation expense related to restricted stock, net of tax			349				349
Compensation expense related to stock options, net of tax				855			855
Other comprehensive income (loss)					(1,271)		(1,271)
Balance at Sep. 30, 2021	$ 79		(1,469)	113,501	(248)	153,766	265,629
Balance, shares at Sep. 30, 2021	7,913,381
Balance at Jun. 30, 2021	$ 79		(1,173)	112,604	400	139,749	251,659
Balance, shares at Jun. 30, 2021	7,899,931
Net income						14,017	14,017
Proceeds from exercise of stock options				175			175
Proceeds from exercise of stock options, shares	4,950
Issuance of restricted stock			(431)	431
Issuance of restricted stock, shares	8,500
Compensation expense related to restricted stock, net of tax			135				135
Compensation expense related to stock options, net of tax				291			291
Other comprehensive income (loss)					(648)		(648)
Balance at Sep. 30, 2021	$ 79		$ (1,469)	$ 113,501	$ (248)	$ 153,766	$ 265,629
Balance, shares at Sep. 30, 2021	7,913,381