CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Additional Capital	Retained Earnings	Accumulated Other Comprehensive Income/(Loss)	Treasury Stock
Balance at Dec. 31, 2008	$ 286,844	$ 1,806	$ 68,654	$ 263,115	$ (12,946)	$ (33,785)
Increase (Decrease) in Shareholders' Equity
Net income	22,720			22,720
Other comprehensive loss, net of tax:
Change in net unrealized gains/(losses) on securities available-for-sale	10,869				10,869
Change in net unrealized gains/(losses) on retirement plans	(2,494)				(2,494)
Adjustment for adoption of other-than temporary impairment guidance, net of tax				3,333	(3,333)
Contribution of 46,250, 45,000 and 35,000 shares to ESOP for the years ended 2011, 2010 and 2009, respectively	971		85			886
Treasury stock purchase (23,000 and 22,000 shares for the years ended 2010 and 2009, respectively)	(616)					(616)
Cash Dividends, $.94, $.92, and $.90 per share for the years ended 2011, 2010 and 2009, respectively	(11,811)			(11,811)
Balance at Dec. 31, 2009	306,483	1,806	68,739	277,357	(7,904)	(33,515)
Increase (Decrease) in Shareholders' Equity
Net income	28,044			28,044
Other comprehensive loss, net of tax:
Change in net unrealized gains/(losses) on securities available-for-sale	449				449
Change in net unrealized gains/(losses) on retirement plans	(1,914)				(1,914)
Contribution of 46,250, 45,000 and 35,000 shares to ESOP for the years ended 2011, 2010 and 2009, respectively	1,347		205			1,142
Treasury stock purchase (23,000 and 22,000 shares for the years ended 2010 and 2009, respectively)	(610)					(610)
Cash Dividends, $.94, $.92, and $.90 per share for the years ended 2011, 2010 and 2009, respectively	(12,082)			(12,082)
Balance at Dec. 31, 2010	321,717	1,806	68,944	293,319	(9,369)	(32,983)
Increase (Decrease) in Shareholders' Equity
Net income	37,195			37,195
Other comprehensive loss, net of tax:
Change in net unrealized gains/(losses) on securities available-for-sale	8,857				8,857
Change in net unrealized gains/(losses) on retirement plans	(9,982)				(9,982)
Contribution of 46,250, 45,000 and 35,000 shares to ESOP for the years ended 2011, 2010 and 2009, respectively	1,558		384			1,174
Cash Dividends, $.94, $.92, and $.90 per share for the years ended 2011, 2010 and 2009, respectively	(12,384)			(12,384)
Balance at Dec. 31, 2011	$ 346,961	$ 1,806	$ 69,328	$ 318,130	$ (10,494)	$ (31,809)