CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]
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
Net income	9,912		9,912
Other comprehensive income (loss), net of tax	2,948			2,948
Cash dividends declared	(3,131)		(3,131)
Treasury shares purchased under deferred directors' plan (in shares)		(5,446)
Treasury shares purchased under deferred directors' plan	0	(209)			209
Treasury stock sold and distributed under deferred directors' plan (in shares)		3,437
Treasury stock sold and distributed under deferred directors' plan		(67)			67
Stock activity under equity compensation plans (in shares)		57,901
Stock activity under equity compensation plans	(199)	(199)
Stock based compensation expense	597	597
Balance at Mar. 31, 2014	332,002	93,789	239,889	454	(2,130)
Balance (in shares) at Mar. 31, 2014		16,433,341
Balance at Dec. 31, 2014	361,296	96,121	263,345	3,830	(2,000)
Balance (in shares) at Dec. 31, 2014		16,465,621
Net income	11,136		11,136
Other comprehensive income (loss), net of tax	2,039			2,039
Cash dividends declared	(3,477)		(3,477)
Treasury shares purchased under deferred directors' plan (in shares)		(4,730)
Treasury shares purchased under deferred directors' plan	0	(191)			191
Stock activity under equity compensation plans (in shares)		60,364
Stock activity under equity compensation plans	(597)	(597)
Stock based compensation expense	353	353
Balance at Mar. 31, 2015	$ 370,750	$ 96,068	$ 271,004	$ 5,869	$ (2,191)
Balance (in shares) at Mar. 31, 2015		16,521,255