CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Paid In Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)
Balance at Dec. 31, 2013	$ 259,518	$ 25,483	$ 214,091	$ 78,673	$ (37,692)	$ (21,037)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	8,224			8,224
Other comprehensive income	6,828					6,828
Issuance of common stock (9,983 shares in 2015 and 8,325 shares in 2014)	257	10	247
Stock compensation expense	286		286
Tax benefits related to stock awards	1		1
Net issuance of common stock under employee stock plans	42	3	130	(91)
Cash dividends paid on common stock ($0.23 per share in 2015 and $0.21 per share in 2014)	(3,763)			(3,763)
Stock dividend declared	0	1,123	24,923	(26,046)
Balance at Mar. 31, 2014	271,393	26,619	239,678	56,997	(37,692)	(14,209)
Balance at Dec. 31, 2014	425,243	33,223	389,886	55,396	(37,692)	(15,570)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	9,379			9,379
Other comprehensive income	5,104					5,104
Issuance of common stock (9,983 shares in 2015 and 8,325 shares in 2014)	304	12	292
Stock compensation expense	273		273
Tax benefits related to stock awards	4		4
Net issuance of common stock under employee stock plans	53	4	60	(11)
Cash dividends paid on common stock ($0.23 per share in 2015 and $0.21 per share in 2014)	(5,546)			(5,546)
Balance at Mar. 31, 2015	$ 434,814	$ 33,239	$ 390,515	$ 59,218	$ (37,692)	$ (10,466)