Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($)	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance at Dec. 31, 2013	$ 12,596,000	$ (3,452,000)	$ 70,105,000	$ 101,216,000	$ (993,000)	$ 179,472,000
Balance (in Shares) at Dec. 31, 2013	12,596,540	206,477
Net income				8,451,000		8,451,000
Other comprehensive income (loss), net					6,409,000	6,409,000
Cash dividends declared on common stock				(6,459,000)		(6,459,000)
Shares issued for dividend reinvestment plan	$ 40,000		716,000			756,000
Shares issued for dividend reinvestment plan (in Shares)	40,009
Shares issued from treasury related to exercise of stock options		$ 93,000	(7,000)			86,000
Shares issued from treasury related to exercise of stock options (in Shares)		(5,577)
Restricted stock granted		$ 279,000	(279,000)			0
Restricted stock granted (in Shares)		(16,711)
Forfeiture of restricted stock		$ (39,000)	39,000			0
Forfeiture of restricted stock (in Shares)		2,355
Stock-based compensation expense			384,000			384,000
Tax effect of stock option exercises			1,000			1,000
Tax benefit from dividends on restricted stock			5,000			5,000
Tax benefit from employee benefit plan				68,000		68,000
Balance at Jun. 30, 2014	$ 12,636,000	$ (3,119,000)	70,964,000	103,276,000	5,416,000	189,173,000
Balance (in Shares) at Jun. 30, 2014	12,636,549	186,544
Balance at Dec. 31, 2014	$ 12,655,000	$ (6,744,000)	71,541,000	105,550,000	5,360,000	188,362,000
Balance (in Shares) at Dec. 31, 2014	12,655,171	375,191
Net income				8,172,000		8,172,000
Other comprehensive income (loss), net					(1,274,000)	(1,274,000)
Cash dividends declared on common stock				(6,373,000)		(6,373,000)
Shares issued for dividend reinvestment plan		$ 713,000	25,000			738,000
Shares issued for dividend reinvestment plan (in Shares)		(37,758)
Treasury stock purchased		$ (3,415,000)				(3,415,000)
Treasury stock purchased (in Shares)		176,000
Shares issued from treasury related to exercise of stock options		$ 404,000	(26,000)			378,000
Shares issued from treasury related to exercise of stock options (in Shares)		(22,235)
Restricted stock granted		$ 627,000	(627,000)			0
Restricted stock granted (in Shares)		(34,800)
Forfeiture of restricted stock		$ (33,000)	33,000			0
Forfeiture of restricted stock (in Shares)		1,943
Stock-based compensation expense			307,000			307,000
Tax effect of stock option exercises			(6,000)			(6,000)
Tax benefit from dividends on restricted stock			11,000			11,000
Tax benefit from employee benefit plan				73,000		73,000
Balance at Jun. 30, 2015	$ 12,655,000	$ (8,448,000)	$ 71,258,000	$ 107,422,000	$ 4,086,000	$ 186,973,000
Balance (in Shares) at Jun. 30, 2015	12,655,171	458,341