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 loss [Member]	Retained earnings [Member]	Total
Balance at Dec. 31, 2017	$ 73		$ (502)	$ 99,986	$ (456)	$ 50,585	$ 149,686
Balance, shares at Dec. 31, 2017	7,347,851
Net income						16,506	16,506
Proceeds from exercise of stock options	$ 1			809			810
Proceeds from exercise of stock options, shares	89,419
Issuance of restricted stock			(501)	501
Issuance of restricted stock, shares	11,500
Compensation expense related to restricted stock, net of tax			233				233
Compensation expense related to stock options, net of tax				875			875
Other comprehensive income					(1,166)		(1,166)
Balance at Sep. 30, 2018	$ 74		(770)	102,171	(1,622)	67,091	166,944
Balance, shares at Sep. 30, 2018	7,448,770
Balance at Jun. 30, 2018	$ 74		(853)	101,691	(1,365)	61,309	160,856
Balance, shares at Jun. 30, 2018	7,425,672
Net income						5,782	5,782
Proceeds from exercise of stock options				172			172
Proceeds from exercise of stock options, shares	23,098
Issuance of restricted stock
Issuance of restricted stock, shares
Compensation expense related to restricted stock, net of tax			83				83
Compensation expense related to stock options, net of tax				308			308
Other comprehensive income					(257)		(257)
Balance at Sep. 30, 2018	$ 74		(770)	102,171	(1,622)	67,091	166,944
Balance, shares at Sep. 30, 2018	7,448,770
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