CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Balances at Dec. 31, 2013	$ 499,363,000	$ 24,990,000	$ 193,445,000	$ 283,898,000	$ (2,970,000)
Net income	17,910,000	0	0	17,910,000	0
Other comprehensive loss, net of tax	8,203,000	0	0	0	8,203,000
Common stock dividends - $0.44 and $0.36 per share at June 30, 2015 and 2014, respectively	(9,094,000)	0	0	(9,094,000)	0
Stock compensation expense	853,000	0	853,000	0	0
Common stock issued pursuant to:
Stock option plan - 26,695 and 13,721 shares at June 30, 2015 and 2014, respectively	188,000	14,000	174,000	0	0
Employee stock purchase plan - 12,613 and 11,423 shares at June 30, 2015 and 2014, respectively	240,000	11,000	229,000	0	0
Restricted stock - 52,921 and 54,535 shares at June 30, 2015 and 2014, respectively	(394,000)	55,000	(449,000)	0	0
Balances at Jun. 30, 2014	517,269,000	25,070,000	194,252,000	292,714,000	5,233,000
Balances at Dec. 31, 2014	521,751,000	25,045,000	194,647,000	302,882,000	(823,000)
Net income	21,558,000	0	0	21,558,000	0
Other comprehensive loss, net of tax	231,000	0	0	0	231,000
Common stock dividends - $0.44 and $0.36 per share at June 30, 2015 and 2014, respectively	(11,041,000)	0	0	(11,041,000)	0
Stock compensation expense	941,000	0	941,000	0	0
Common stock issued pursuant to:
Stock option plan - 26,695 and 13,721 shares at June 30, 2015 and 2014, respectively	391,000	26,000	365,000	0	0
Directors stock purchase plan - 837 shares	22,000	1,000	21,000	0	0
Employee stock purchase plan - 12,613 and 11,423 shares at June 30, 2015 and 2014, respectively	276,000	12,000	264,000	0	0
Restricted stock - 52,921 and 54,535 shares at June 30, 2015 and 2014, respectively	(341,000)	53,000	(394,000)	0	0
Purchase of treasury shares - 575,472 shares	(14,915,000)	(575,000)	(14,340,000)	0	0
Balances at Jun. 30, 2015	$ 518,873,000	$ 24,562,000	$ 181,504,000	$ 313,399,000	$ (592,000)