Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (USD $) In Thousands	Total	Common Stock	Additional Paid-in Capital (In thousands, except per share data)	Retained Earnings (In thousands, except per share data)	Accumulated Other Comprehensive Loss (In thousands, except per share data)
Beginning balance at Dec. 31, 2009	$ 474,311	$ 23,891	$ 347,676	$ 115,391	$ (12,647)
Comprehensive income:
Net income	6,680			6,680
Other:
Net unrealized gains on investment securities-available-for-sale, net of tax expense of $207 and $239 in 2010 and 2011 respectively					384
Adjustment for pension and other postretirement benefits, net of tax expense of $29 and $126 in 2010 and 2011 respectively					54
Comprehensive income	7,118
Shares issued - stock options	42	1	41
Shares and stock options issued in the acquisition of O.A.K. Financial Corporation	83,697	3,530	80,167
Cash dividends declared of $0.40 per share	(10,267)			(10,267)
Shares issued - directors' stock purchase plan	250	12	238
Share-based compensation	899		899
Ending balance at Jun. 30, 2010	556,050
Beginning balance at Dec. 31, 2010	560,078	27,440	429,511	117,238	(14,111)
Comprehensive income:
Net income	20,221			20,221
Other:
Net unrealized gains on investment securities-available-for-sale, net of tax expense of $207 and $239 in 2010 and 2011 respectively					444
Adjustment for pension and other postretirement benefits, net of tax expense of $29 and $126 in 2010 and 2011 respectively					234
Comprehensive income	20,899
Cash dividends declared of $0.40 per share	(10,982)			(10,982)
Shares issued - directors' stock purchase plan	266	12	254
Share-based compensation	374	5	369
Ending balance at Jun. 30, 2011	$ 570,635	$ 27,457	$ 430,134	$ 126,477	$ (13,433)