LOANS (excluding covered loans) - Nonaccrual, Restructured and Impaired Loans (Detail) (Non Covered Loans, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Financing Receivable, Modifications [Line Items]
Nonaccrual loans	$ 55,945		$ 54,299
Restructured Loans, Accrual Status	9,495		4,009
Restructured loans - nonaccrual status	17,205		18,071
Total restructured loans	26,700		22,080
Total impaired loans	82,645		76,379
Interest income effect
Gross amount of interest that would have been recorded under original terms	1,330	1,409
Interest included in income
Nonaccrual loans	209	145
Restructured loans	83	82
Total interest included in income	292	227
Net impact on interest income	1,038	1,182
Commercial
Financing Receivable, Modifications [Line Items]
Nonaccrual loans	5,936		7,809
Total impaired loans	12,671		10,482
Real estate-construction
Financing Receivable, Modifications [Line Items]
Nonaccrual loans	7,005		10,005
Total impaired loans	12,733		17,387
Real estate-commercial
Financing Receivable, Modifications [Line Items]
Nonaccrual loans	35,581		28,349
Total impaired loans	44,220		34,520
Real estate-residential
Financing Receivable, Modifications [Line Items]
Nonaccrual loans	5,131		5,692
Total impaired loans	10,513		11,331
Installment
Financing Receivable, Modifications [Line Items]
Nonaccrual loans	377		371
Total impaired loans	492		485
Home equity
Financing Receivable, Modifications [Line Items]
Nonaccrual loans	1,915		2,073
Total impaired loans	$ 2,016		$ 2,174