CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Thousands	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Balance at Dec. 31, 2011	$ 273,200	$ 87,380	$ 181,903	$ 5,139	$ (1,222)
Net income	26,792		26,792
Other comprehensive income (loss), net of tax	1,505			1,505
Common stock cash dividends declared	(8,080)		(8,080)
Treasury shares purchased under deferred directors' plan	0	391			(391)
Stock activity under stock compensation plans, net of taxes	323	323
Stock compensation expense	1,161	1,161
Balance at Sep. 30, 2012	294,901	89,255	200,615	6,644	(1,613)
Balance at Dec. 31, 2012	297,739	90,039	203,654	5,689	(1,643)
Net income	28,251		28,251
Other comprehensive income (loss), net of tax	(7,141)			(7,141)
Common stock cash dividends declared	(6,257)		(6,257)
Treasury shares purchased under deferred directors' plan	0	381			(381)
Treasury stock sold and distributed under deferred directors' plan	0	(54)			54
Stock activity under stock compensation plans, net of taxes	498	498
Stock compensation expense	1,365	1,365
Balance at Sep. 30, 2013	$ 314,455	$ 92,229	$ 225,648	$ (1,452)	$ (1,970)