CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Balance at Dec. 31, 2012	$ 297,739	$ 90,039	$ 203,654	$ 5,689	$ (1,643)
Balance (in shares) at Dec. 31, 2012		16,290,136
Comprehensive income:
Net income	28,251		28,251
Other comprehensive income (loss), net of tax	(7,141)			(7,141)
Cash dividends declared	(6,257)		(6,257)
Treasury shares purchased under deferred directors' plan	0	381			(381)
Treasury shares purchased under deferred directors' plan (in shares)		(13,652)
Treasury stock sold and distributed under deferred directors' plan	0	(54)			54
Treasury stock sold and distributed under deferred directors' plan (in shares)		3,018
Stock activity under equity compensation plans	498	498
Stock activity under equity compensation plans (in shares)		81,909
Stock based compensation expense	1,365	1,365
Balance at Sep. 30, 2013	314,455	92,229	225,648	(1,452)	(1,970)
Balance (in shares) at Sep. 30, 2013		16,361,411
Balance at Dec. 31, 2013	321,875	93,249	233,108	(2,494)	(1,988)
Balance (in shares) at Dec. 31, 2013		16,377,449
Comprehensive income:
Net income	32,735		32,735
Other comprehensive income (loss), net of tax	5,081			5,081
Cash dividends declared	(10,092)		(10,092)
Treasury shares purchased under deferred directors' plan	0	427			(427)
Treasury shares purchased under deferred directors' plan (in shares)		(11,042)
Treasury stock sold and distributed under deferred directors' plan	0	(432)			432
Treasury stock sold and distributed under deferred directors' plan (in shares)		25,031
Stock activity under equity compensation plans	(6)	(6)
Stock activity under equity compensation plans (in shares)		72,358
Stock based compensation expense	2,267	2,267
Balance at Sep. 30, 2014	$ 351,860	$ 95,505	$ 255,751	$ 2,587	$ (1,983)
Balance (in shares) at Sep. 30, 2014		16,463,796