COVERED LOANS - Changes in Covered Other Real Estate Owned (Detail) (Covered Loans, USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at beginning of period	$ 25,408	$ 36,687	$ 44,818	$ 35,257
Additions	9,315	17,189	17,100	40,746
Disposals	5,858	10,341	26,771	27,932
Write-downs	249	697	6,531	5,233
Balance at end of period	28,616	42,838	28,616	42,838
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Additions	8,578	16,699	13,677	38,431
Disposals	5,858	9,440	24,417	20,940
Write-downs	249	614	5,665	4,138
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Additions	737	490	3,423	2,315
Disposals	0	901	2,354	6,992
Write-downs	$ 0	$ 83	$ 866	$ 1,095