Condensed Financial Statements - Parent Company Only (Schedule of Condensed Income Statement) (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest expense	$ 2,800	$ 2,672	$ 2,462	$ 2,248	$ 2,111	$ 2,079	$ 2,033	$ 1,919	$ 1,860	$ 1,918	$ 1,902	$ 1,665	$ 10,182	$ 8,142	$ 7,345
Net interest income	10,773	11,008	10,933	10,674	10,473	10,144	9,895	9,393	9,348	9,084	9,033	9,063	43,388	39,905	36,528
Miscellaneous expenses													(746)	(861)	(1,059)
(Loss) income before income taxes and equity in undistributed net income of subsidiary	3,997	4,499	4,079	3,790	3,378	2,977	2,816	2,576	2,339	2,018	2,715	2,904	16,365	11,747	9,976
Federal and state income tax benefit	(4,456)	(1,717)	(1,536)	(1,448)	(1,356)	(1,014)	(1,078)	(968)	(811)	(735)	(1,004)	(1,083)	(9,157)	(4,416)	(3,633)
Net income					$ 2,022	$ 1,963	$ 1,738	$ 1,608	1,528	1,283	1,711	1,821	7,208	7,331	6,343
Preferred stock dividends												23			23
Net income available to common shareholders	$ (459)	$ 2,782	$ 2,543	$ 2,342					$ 1,528	$ 1,283	$ 1,711	$ 1,798	7,208	7,331	6,320
Parent Company [Member]
Dividends from subsidiary													7,500	5,500	2,775
Interest income													64	19	51
Interest expense													1,865	1,795	1,599
Net interest income													5,699	3,724	1,227
Miscellaneous expenses													(2,968)	(2,110)	(1,421)
(Loss) income before income taxes and equity in undistributed net income of subsidiary													2,731	1,614	(194)
Federal and state income tax benefit													1,583	1,321	1,009
Equity in undistributed net income of subsidiary													2,894	4,396	5,528
Net income													7,208	7,331	6,343
Preferred stock dividends															23
Net income available to common shareholders													$ 7,208	$ 7,331	$ 6,320