CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands	Common stock	Surplus	Retained Earnings	Accumulated Other Comprehensive Income (loss)	Total
Balance beginning of the period (Footnote 1) at Dec. 31, 2017	$ 6,392	$ 79,501	$ 15,453	$ (298)	$ 101,048
Comprehensive income:
Net income			1,270		1,270
Change in unrealized gains on securities available-for-sale, net of tax				(276)	(276)
Total comprehensive income					994
Compensation expense related to stock option grants		3			3
Balance ending of the period at Mar. 31, 2018	6,392	79,504	16,723	(574)	102,045
Balance beginning of the period (Footnote 1) at Dec. 31, 2017	6,392	79,501	15,453	(298)	101,048
Comprehensive income:
Net income					5,799
Change in unrealized gains on securities available-for-sale, net of tax					(510)
Total comprehensive income					5,289
Balance ending of the period at Sep. 30, 2018	6,407	79,852	21,252	(808)	106,703
Balance beginning of the period (Footnote 1) at Mar. 31, 2018	6,392	79,504	16,723	(574)	102,045
Comprehensive income:
Net income			1,802		1,802
Change in unrealized gains on securities available-for-sale, net of tax				(63)	(63)
Total comprehensive income					1,739
Share-based awards and exercises	9				9
Compensation expense related to stock option grants		272			272
Balance ending of the period at Jun. 30, 2018	6,401	79,776	18,525	(637)	104,065
Comprehensive income:
Net income			2,727		2,727
Change in unrealized gains on securities available-for-sale, net of tax				(171)	(171)
Total comprehensive income					2,556
Share-based awards and exercises	6				6
Compensation expense related to stock option grants		76			76
Balance ending of the period at Sep. 30, 2018	6,407	79,852	21,252	(808)	106,703
Balance beginning of the period (Footnote 1) at Dec. 31, 2018	6,407	79,919	23,616	(390)	109,552
Comprehensive income:
Net income			2,006		2,006
Change in unrealized gains on securities available-for-sale, net of tax				373	373
Total comprehensive income					2,379
Compensation expense related to stock option grants		61			61
Balance ending of the period at Mar. 31, 2019	6,407	79,980	25,622	(17)	111,992
Balance beginning of the period (Footnote 1) at Dec. 31, 2018	6,407	79,919	23,616	(390)	109,552
Comprehensive income:
Net income					7,345
Change in unrealized gains on securities available-for-sale, net of tax					601
Total comprehensive income					7,946
Balance ending of the period at Sep. 30, 2019	6,408	80,192	30,961	211	117,772
Balance beginning of the period (Footnote 1) at Mar. 31, 2019	6,407	79,980	25,622	(17)	111,992
Comprehensive income:
Net income			2,022		2,022
Change in unrealized gains on securities available-for-sale, net of tax				222	222
Total comprehensive income					2,244
Compensation expense related to stock option grants		143			143
Balance ending of the period at Jun. 30, 2019	6,407	80,123	27,644	205	114,379
Comprehensive income:
Net income			3,317		3,317
Change in unrealized gains on securities available-for-sale, net of tax				6	6
Total comprehensive income					3,323
Share-based awards and exercises	1	7			8
Compensation expense related to stock option grants		62			62
Balance ending of the period at Sep. 30, 2019	$ 6,408	$ 80,192	$ 30,961	$ 211	$ 117,772