Unaudited Condensed Consolidated Statements of Changes in Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Beginning balance (in shares) at Dec. 31, 2016	7,509
Beginning balance at Dec. 31, 2016	$ 939	$ 51,885	$ 134,650	$ (3,408)	$ 184,066
Net income			3,329		3,329
Other comprehensive loss				1,013	1,013
Cash dividends declared – common			(751)		(751)
Shares issued under director compensation plan		28			28
Shares issued pursuant to employee stock purchase plan (in shares)	2
Shares issued pursuant to employee stock purchase plan		46			46
Expense related to employee stock purchase plan		9			9
Shares issued under director compensation plan (in shares)	1
Ending balance (in shares) at Mar. 31, 2017	7,512
Ending balance at Mar. 31, 2017	$ 939	51,968	137,228	(2,395)	187,740
Adoption of Accounting Standards Update 2016-01
Beginning balance (in shares) at Dec. 31, 2017	7,517
Beginning balance at Dec. 31, 2017	$ 940	52,201	143,778	(3,566)	193,353
Net income			5,641		5,641
Other comprehensive loss				(4,103)	(4,103)
Cash dividends declared – common			(940)		(940)
Shares issued under director compensation plan		18			18
Shares issued pursuant to employee stock purchase plan (in shares)	2
Shares issued pursuant to employee stock purchase plan		51			51
Expense related to employee stock purchase plan		8			8
Ending balance (in shares) at Mar. 31, 2018	7,519
Ending balance at Mar. 31, 2018	$ 940	52,278	148,535	(7,725)	194,028
Adoption of Accounting Standards Update 2016-01			$ 56	$ (56)