Condensed Consolidated Statements of Changes in Shareholders' Equity [Unaudited] (USD $)	Preferred Stock [Member]	Common Stock [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balances at Dec. 31, 2013	$ 0	$ 162,999,000	$ (4,101,000)	$ (5,573,000)	$ 153,325,000
Stock-based compensation expense		118,000			118,000
Cash dividends		(1,041,000)			(1,041,000)
Net income			3,580,000		3,580,000
Change in net unrealized gain on securities available for sale, net of tax effect				1,698,000	1,698,000
Change in fair value of interest rate swap, net of tax effect				9,000	9,000
Balances at Mar. 31, 2014	0	162,076,000	(521,000)	(3,866,000)	157,689,000
Balances at Dec. 31, 2014	0	317,904,000	10,218,000	16,000	328,138,000
Employee stock purchase plan (543 shares)		10,000			10,000
Dividend reinvestment plan (7,172 shares)		140,000			140,000
Stock option exercises (13,500 shares)		132,000			132,000
Stock grants to directors for retainer fees (5,994 shares)		123,000			123,000
Stock-based compensation expense		212,000			212,000
Share repurchase program (103,981 shares)		(1,984,000)			(1,984,000)
Cash dividends			(2,377,000)		(2,377,000)
Net income			6,646,000		6,646,000
Change in net unrealized gain on securities available for sale, net of tax effect				1,876,000	1,876,000
Change in fair value of interest rate swap, net of tax effect				(128,000)	(128,000)
Balances at Mar. 31, 2015	$ 0	$ 316,537,000	$ 14,487,000	$ 1,764,000	$ 332,788,000