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, 2011	$ 218,876	$ 51,438	$ 165,377	$ 2,061
Beginning Balance (in shares) at Dec. 31, 2011		7,664,975
Net income	6,583		6,583
Other comprehensive income, net of tax:
Change in fair value of securities available for sale	(1,298)			(1,298)
Change in fair value of cash flow hedges	1,525			1,525
Change in net unrecognized losses on postretirement plans	27			27
Comprehensive income	6,837		6,583	254
Stock-based compensation expense	130	130
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)
Cash dividends declared	(1,945)		(1,945)
Ending Balance at Mar. 31, 2012	223,658	51,328	170,015	2,315
Ending Balance (in shares) at Mar. 31, 2012		7,684,589
Beginning Balance at Dec. 31, 2012	233,815	49,667	181,151	2,997
Beginning Balance (in shares) at Dec. 31, 2012		7,622,750
Net income	5,662		5,662
Other comprehensive income, net of tax:
Change in fair value of securities available for sale	(2,889)			(2,889)
Change in fair value of cash flow hedges	850			850
Change in net unrecognized losses on postretirement plans	47			47
Comprehensive income	3,670		5,662	(1,992)
Stock-based compensation expense	173	173
Exercise of stock options and issuance of restricted stock, net of repurchase for tax withholdings and tax benefit (in shares)		13,207
Exercise of stock options and issuance of restricted stock, net of repurchase for tax withholdings and tax benefit	(19)	(19)
Cash dividends declared	(2,064)		(2,064)
Ending Balance at Mar. 31, 2013	$ 235,575	$ 49,821	$ 184,749	$ 1,005
Ending Balance (in shares) at Mar. 31, 2013		7,635,957