CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Nonvested restricted stock [Member]	Common stock [Member]	Preferred stock [Member]	Additional paid-in capital [Member]	Accumulated other comprehensive income (loss) [Member]	Retained Earnings [Member]	Total
Balance at Dec. 31, 2017	$ (502)	$ 73		$ 99,986	$ (456)	$ 50,585	$ 149,686
Balance, shares at Dec. 31, 2017		7,347,851
Net income						22,289	22,289
Proceeds from exercise of stock options		$ 2		898			900
Proceeds from exercise of stock options, shares		105,630
Issuance of restricted stock	(558)			558
Issuance of restricted stock, shares		13,000
Compensation expense related to restricted stock, net of tax	319						319
Compensation expense related to stock options, net of tax				1,183			1,183
Other comprehensive income (loss)					(461)		(461)
Balance at Dec. 31, 2018	(741)	$ 75		102,625	(917)	72,874	173,916
Balance, shares at Dec. 31, 2018		7,466,481
Net income						27,858	27,858
Proceeds from exercise of stock options		$ 2		1,767			1,769
Proceeds from exercise of stock options, shares		191,497
Issuance of restricted stock	(490)			490
Issuance of restricted stock, shares		14,700
Compensation expense related to restricted stock, net of tax	428						428
Compensation expense related to stock options, net of tax				1,270			1,270
Other comprehensive income (loss)					619		619
Balance at Dec. 31, 2019	(803)	$ 77		106,152	(298)	100,732	205,860
Balance, shares at Dec. 31, 2019		7,672,678
Net income						18,328	18,328
Proceeds from exercise of stock options		$ 1		1,387			1,388
Proceeds from exercise of stock options, shares		93,870
Issuance of restricted stock, net of forfeitures	(275)			275
Issuance of restricted stock, net of forfeitures, shares		6,200
Compensation expense related to restricted stock, net of tax	380						380
Compensation expense related to stock options, net of tax				1,017			1,017
Other comprehensive income (loss)					1,321		1,321
Balance at Dec. 31, 2020	$ (698)	$ 78		$ 108,831	$ 1,023	$ 119,060	$ 228,294
Balance, shares at Dec. 31, 2020		7,772,748