Consolidated Statements of Stockholders' Equity (Unaudited) (USD $) In Thousands, unless otherwise specified	Total	Preferred Stock [Member]	Common Stock [Member]	Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Treasury Stock [Member]
Beginning balance at Dec. 31, 2013	$ 230,183	$ 400	$ 14,157	$ 158,650	$ 73,491	$ (16,515)	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	4,944	0	0	0	4,944	0
Other comprehensive (loss) income	5,495	0	0	0	0	5,495
Dividends declared on preferred stock	(20)	0	0	0	(20)	0
Common stock issued under stock option plans, including tax benefit	119	0	9	110	0	0
Common stock issued under employee stock purchase plan	0	0	0	0	0	0
Proceeds from issuance of common stock in connection with dividend reinvestment and stock purchase plan	15	0	1	14	0	0
Common stock share-based awards	51	0	0	51	0	0
Ending balance at Mar. 31, 2014	240,787	400	14,167	158,825	78,415	(11,020)	0
Beginning balance at Dec. 31, 2014	265,523	400	14,233	160,588	94,496	(3,875)	(319)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,722	0	0	0	5,722	0
Other comprehensive (loss) income	2,709	0	0	0	0	2,709
Dividends declared on preferred stock	(20)	0	0	0	(20)	0
Dividends declared on common stock	(994)	0	0	0	(994)	0
Common stock issued under stock option plans, including tax benefit	707	0	59	648	0	0
Common stock issued under employee stock purchase plan	2	0	0	2	0	0
Proceeds from issuance of common stock in connection with dividend reinvestment and stock purchase plan	33	0	1	32	0	0
Common stock share-based awards	61	0	0	61	0	0
Purchase of 117,000 shares of treasury stock	(2,979)						(2,979)
Ending balance at Mar. 31, 2015	$ 270,764	$ 400	$ 14,293	$ 161,331	$ 99,204	$ (1,166)	$ (3,298)