DISCONTINUED OPERATIONS (Textual) (Details) (USD $)	3 Months Ended		3 Months Ended	12 Months Ended	3 Months Ended			0 Months Ended	3 Months Ended	0 Months Ended			3 Months Ended		0 Months Ended
	Dec. 31, 2012 Bradenton, Palmetto, Longboat Key Florida offices	Dec. 31, 2010 Northern Illinois Region offices contracts	Sep. 30, 2010 Northern Illinois Region First	Dec. 31, 2010 Northern Illinois Region First	Jun. 30, 2011 Northern Illinois Region Second	Dec. 31, 2012 Hillsborough County offices	Dec. 31, 2012 Northern Florida offices	Apr. 15, 2010 Missouri Valley Partners, Inc.	Jun. 30, 2010 Missouri Valley Partners, Inc.	Aug. 31, 2010 WIUS, Inc. and WIUS of California, Inc.	Feb. 26, 2010 WIUS, Inc. and WIUS of California, Inc.	Dec. 31, 2009 WIUS, Inc. and WIUS of California, Inc.	Sep. 30, 2010 WIUS, Inc. and WIUS of California, Inc.	Nov. 21, 2012 HomeBanc National Association offices	May 13, 2011 United Community Bank offices	Sep. 24, 2010 Bank of Springfield	Sep. 10, 2010 First Mid-Illinois Bank & Trust, N.A. offices	Apr. 30, 2010 Prosperity Bank offices	Feb. 19, 2010 FirstMerit Bank, N.A. offices
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Branch Offices to Be Sold Pursuant to Sales Agreement		14												8
Deposits Assumed														$ 133,400,000	$ 92,200,000	$ 28,900,000	$ 336,000,000	$ 492,200,000	$ 1,200,000,000
Number of Branch Offices to Be Closed						2	3
Number of Branches Reclassified from Discontinued to Continuing Operations	8
Impairment of Long-Lived Assets Held-for-use	2,300,000
Number of Sales Agreements Entered Into		3
Number of Branch Offices Sold		14													3		10	19	24
Deposits Assumed, Assumption Premium Proceeds, Percent of Assumed Deposits															2.40%	4.00%	4.77%	5.50%	3.50%
Deposits Assumed, Assumption Premium Proceeds															2,200,000	1,200,000	15,600,000	26,900,000	42,100,000
Proceeds from Sale and Collection of Loans Held-for-sale											1,500,000	141,300,000			37,500,000	2,200,000	135,200,000	96,700,000	301,200,000
Gain (Loss) on Sale of Branch Offices				6,400,000	425,000				(156,000)				(29,000)					5,000,000	8,400,000
Goodwill and Intangible Asset Impairment			9,700,000		1,600,000													20,000,000	26,300,000
Proceeds from Divestiture of Businesses								$ 515,000		$ 100,000