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
Beginning Balances at Dec. 31, 2015	$ 0	$ 304,819,000	$ 27,722,000	$ 1,263,000	$ 333,804,000
Employee stock purchase plan		8,000			8,000
Dividend reinvestment plan		411,000			411,000
Stock option exercises		50,000			50,000
Stock-based compensation expense		330,000			330,000
Share repurchase program		(3,258,000)			(3,258,000)
Cash dividends			(2,574,000)		(2,574,000)
Net income			8,549,000		8,549,000
Change in net unrealized holding gain/(loss) on securities available for sale, net of tax effect				1,247,000	1,247,000
Change in fair value of interest rate swap, net of tax effect				(14,000)	(14,000)
Balances at Mar. 31, 2016	0	302,360,000	33,697,000	2,496,000	338,553,000
Beginning Balances at Dec. 31, 2016	0	305,488,000	40,904,000	(5,581,000)	340,811,000
Employee stock purchase plan		12,000			12,000
Dividend reinvestment plan		1,145,000			1,145,000
Stock option exercises		248,000			248,000
Stock grant for director fees		2,000			2,000
Stock-based compensation expense		476,000			476,000
Cash dividends			(2,923,000)		(2,923,000)
Net income			7,615,000		7,615,000
Change in net unrealized holding gain/(loss) on securities available for sale, net of tax effect				637,000	637,000
Change in fair value of interest rate swap, net of tax effect				27,000	27,000
Balances at Mar. 31, 2017	$ 0	$ 307,371,000	$ 45,596,000	$ (4,917,000)	$ 348,050,000