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, 2018	$ 75		$ (741)	$ 102,625	$ (917)	$ 72,874	$ 173,916
Balance, shares at Dec. 31, 2018	7,466,481
Net income						20,661	20,661
Proceeds from exercise of stock options	$ 1			1,315			1,316
Proceeds from exercise of stock options, shares	137,338
Issuance of restricted stock			(490)	490
Issuance of restricted stock, shares	14,700
Compensation expense related to restricted stock, net of tax			312				312
Compensation expense related to stock options, net of tax				948			948
Other comprehensive income					1,341		1,341
Balance at Sep. 30, 2019	$ 76		(919)	105,378	424	93,535	198,494
Balance, shares at Sep. 30, 2019	7,618,519
Balance at Jun. 30, 2019	$ 76		(887)	104,354	188	86,123	189,854
Balance, shares at Jun. 30, 2019	7,557,923
Net income						7,412	7,412
Proceeds from exercise of stock options				557			557
Proceeds from exercise of stock options, shares	56,596
Issuance of restricted stock			(143)	143
Issuance of restricted stock, shares	4,000
Compensation expense related to restricted stock, net of tax			111				111
Compensation expense related to stock options, net of tax				324			324
Other comprehensive income					236		236
Balance at Sep. 30, 2019	$ 76		(919)	105,378	424	93,535	198,494
Balance, shares at Sep. 30, 2019	7,618,519
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					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					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