LOANS (excluding covered loans) - Nonaccrual, Restructured and Impaired Loans (Detail) (USD $) In Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2011	Dec. 31, 2010
Financing Receivable, Modifications [Line Items]
Total impaired loans	$ 2,937,661	$ 2,937,661	$ 2,816,093
Non Covered Loans
Financing Receivable, Modifications [Line Items]
Nonaccrual loans	59,150	59,150	62,302
Restructured loans - accrual status	4,712	4,712	3,508
Restructured loans - nonaccrual status	12,571	12,571	14,105
Total restructured loans	17,283	17,283	17,613
Total impaired loans	76,433	76,433	79,915
Interest income effect
Gross amount of interest that would have been recorded under original terms	1,390	4,103
Interest included in income
Nonaccrual loans	108	358
Restructured loans	49	215
Total interest included in income	157	573
Net impact on interest income	1,233	3,530
Non Covered Loans | Commercial
Financing Receivable, Modifications [Line Items]
Nonaccrual loans	10,792	10,792	13,729
Total impaired loans	11,146	11,146	13,729
Non Covered Loans | Real estate-construction
Financing Receivable, Modifications [Line Items]
Nonaccrual loans	13,844	13,844	12,921
Total impaired loans	20,091	20,091	19,332
Non Covered Loans | Real estate-commercial
Financing Receivable, Modifications [Line Items]
Nonaccrual loans	26,408	26,408	28,342
Total impaired loans	31,556	31,556	34,124
Non Covered Loans | Real estate-residential
Financing Receivable, Modifications [Line Items]
Nonaccrual loans	5,507	5,507	4,607
Total impaired loans	10,829	10,829	10,027
Non Covered Loans | Installment
Financing Receivable, Modifications [Line Items]
Nonaccrual loans	322	322	150
Total impaired loans	433	433	150
Non Covered Loans | Home equity
Financing Receivable, Modifications [Line Items]
Nonaccrual loans	2,277	2,277	2,553
Total impaired loans	2,378	2,378	2,553
Commercial
Financing Receivable, Modifications [Line Items]
Total impaired loans	822,552	822,552	800,253
Real estate-construction
Financing Receivable, Modifications [Line Items]
Total impaired loans	136,651	136,651	163,543
Real estate-commercial
Financing Receivable, Modifications [Line Items]
Total impaired loans	1,202,035	1,202,035	1,139,931
Real estate-residential
Financing Receivable, Modifications [Line Items]
Total impaired loans	300,165	300,165	269,173
Installment
Financing Receivable, Modifications [Line Items]
Total impaired loans	70,034	70,034	69,711
Home equity
Financing Receivable, Modifications [Line Items]
Total impaired loans	$ 362,919	$ 362,919	$ 341,310