CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income
Beginning Balance at Dec. 31, 2010	$ 205,995	$ 50,936	$ 150,730	$ 4,329
Beginning Balance (in shares) at Dec. 31, 2010		7,658,496
Net income	13,409		13,409
Other comprehensive income, net of tax:
Change in fair value of securities available for sale	3,558			3,558
Change in fair value of cash flow hedges	(1,082)			(1,082)
Change in net unrecognized losses on postretirement plans	28			28
Comprehensive income	15,913		13,409	2,504
Stock-based compensation expense	343	343
Exercise of stock options and issuance of restricted stock, net of repurchase for tax withholdings and tax benefit (in shares)		27,332
Exercise of stock options and issuance of restricted stock, net of repurchase for tax withholdings and tax benefit	104	104
Common stock repurchased (in shares)		(8,135)
Common stock repurchased	(272)	(272)
Cash dividends declared ($0.50 per share)	(3,842)		(3,842)
Ending Balance at Jun. 30, 2011	218,241	51,111	160,297	6,833
Ending Balance (in shares) at Jun. 30, 2011		7,677,693
Beginning Balance at Dec. 31, 2011	218,876	51,438	165,377	2,061
Beginning Balance (in shares) at Dec. 31, 2011		7,664,975
Net income	12,995		12,995
Other comprehensive income, net of tax:
Change in fair value of securities available for sale	954			954
Change in fair value of cash flow hedges	(754)			(754)
Change in net unrecognized losses on postretirement plans	54			54
Comprehensive income	13,249		12,995	254
Stock-based compensation expense	172	172
Exercise of stock options and issuance of restricted stock, net of repurchase for tax withholdings and tax benefit (in shares)		19,614
Exercise of stock options and issuance of restricted stock, net of repurchase for tax withholdings and tax benefit	(240)	(240)
Common stock repurchased (in shares)		(65,580)
Common stock repurchased	(2,097)	(2,097)
Cash dividends declared ($0.50 per share)	(3,872)		(3,872)
Ending Balance at Jun. 30, 2012	$ 226,088	$ 49,273	$ 174,500	$ 2,315
Ending Balance (in shares) at Jun. 30, 2012		7,619,009