ALLOWANCE FOR LOAN AND LEASE LOSSES - Changes in Allowance for Loan and Lease Losses (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013		Jun. 30, 2014	Dec. 31, 2013
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning balance	$ 241,177	$ 301,047	$ 285,858	$ 435,414
Charge-offs	(53,937)	(39,444)	(166,698)	(182,157)
Charge-off related to bulk sale				(196,491)
Recoveries	11,195	5,581	20,616	11,831
Provision For Loan Lease And Other Losses	26,999	22,195	85,658	220,782
Reclassification				0	[1]
Ending balance	225,434	289,379	225,434	289,379
Balance at end of period	55,284	106,175	55,284	106,175		68,358	102,601
Ending balance: general allowance	170,150	183,204	170,150	183,204
Ending balance	9,315,402	9,508,634	9,315,402	9,508,634			9,636,170
Ending balance: impaired loans	973,014	904,509	973,014	904,509		908,858	919,112
Ending balance: purchased credit-impaired loans	104,313		104,313				4,791
Ending balance: loans with general allowance	8,238,075	8,598,162	8,238,075	8,598,162
Purchased Credit Impaired [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Ending balance: purchased credit-impaired loans	0	0	0	0
Ending balance: purchased credit-impaired loans	104,313	5,963	104,313	5,963
Residential Mortgage [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning balance	29,755	35,581	33,110	68,354
Charge-offs	(5,970)	(8,698)	(17,379)	(25,351)
Charge-off related to bulk sale				(98,972)
Recoveries	236	241	605	868
Provision For Loan Lease And Other Losses	5,885	4,663	13,570	86,888
Reclassification				0	[1]
Ending balance	29,906	31,787	29,906	31,787
Balance at end of period	11,658	17,982	11,658	17,982
Ending balance: general allowance	18,248	13,805	18,248	13,805
Ending balance	2,819,648	2,519,457	2,819,648	2,519,457
Ending balance: impaired loans	421,823	397,025	421,823	397,025
Ending balance: loans with general allowance	2,298,290	2,122,432	2,298,290	2,122,432
Residential Mortgage [Member] | Purchased Credit Impaired [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Ending balance: purchased credit-impaired loans	0	0	0	0
Ending balance: purchased credit-impaired loans	99,535	0	99,535	0
Commercial Mortgage [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning balance	48,578	88,013	73,138	97,692
Charge-offs	(2,823)	(5,944)	(22,056)	(25,214)
Charge-off related to bulk sale				(40,057)
Recoveries	3,939	26	8,271	64
Provision For Loan Lease And Other Losses	2,721	(59)	(6,938)	38,860
Reclassification				10,691	[1]
Ending balance	52,415	82,036	52,415	82,036
Balance at end of period	14,128	28,316	14,128	28,316
Ending balance: general allowance	38,287	53,720	38,287	53,720
Ending balance	1,812,094	1,857,794	1,812,094	1,857,794
Ending balance: impaired loans	238,332	205,654	238,332	205,654
Ending balance: loans with general allowance	1,570,344	1,652,140	1,570,344	1,652,140
Commercial Mortgage [Member] | Purchased Credit Impaired [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Ending balance: purchased credit-impaired loans	0	0	0	0
Ending balance: purchased credit-impaired loans	3,418	0	3,418	0
Commercial And Industrial Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning balance	76,890	87,677	85,295	146,900
Charge-offs	(17,605)	(7,419)	(59,516)	(54,849)
Charge-off related to bulk sale				(44,678)
Recoveries	1,174	1,701	2,253	3,460
Provision For Loan Lease And Other Losses	3,017	1,090	35,444	41,656
Reclassification				(9,440)	[1]
Ending balance	63,476	83,049	63,476	83,049
Balance at end of period	21,267	34,438	21,267	34,438
Ending balance: general allowance	42,209	48,611	42,209	48,611
Ending balance	2,515,384	2,908,347	2,515,384	2,908,347
Ending balance: impaired loans	241,413	200,285	241,413	200,285
Ending balance: loans with general allowance	2,273,971	2,708,062	2,273,971	2,708,062
Commercial And Industrial Loans [Member] | Purchased Credit Impaired [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Ending balance: purchased credit-impaired loans	0	0	0	0
Ending balance: purchased credit-impaired loans	0	0	0	0
Construction Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning balance	21,292	34,728	35,814	61,600
Charge-offs	(7,691)	(1,824)	(11,322)	(30,070)
Charge-off related to bulk sale				(12,784)
Recoveries	4,486	1,895	5,158	2,042
Provision For Loan Lease And Other Losses	(3,652)	1,304	(15,215)	16,566
Reclassification				(1,251)	[1]
Ending balance	14,435	36,103	14,435	36,103
Balance at end of period	2,936	21,785	2,936	21,785
Ending balance: general allowance	11,499	14,318	11,499	14,318
Ending balance	141,689	163,610	141,689	163,610
Ending balance: impaired loans	39,441	73,482	39,441	73,482
Ending balance: loans with general allowance	102,248	90,128	102,248	90,128
Construction Loans [Member] | Purchased Credit Impaired [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Ending balance: purchased credit-impaired loans	0	0	0	0
Ending balance: purchased credit-impaired loans	0	0	0	0
Consumer Loan [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning balance	64,662	55,048	58,501	60,868
Charge-offs	(19,848)	(15,559)	(56,425)	(46,673)
Charge-off related to bulk sale				0
Recoveries	1,360	1,718	4,329	5,397
Provision For Loan Lease And Other Losses	19,028	15,197	58,797	36,812
Reclassification				0	[1]
Ending balance	65,202	56,404	65,202	56,404
Balance at end of period	5,295	3,654	5,295	3,654
Ending balance: general allowance	59,907	52,750	59,907	52,750
Ending balance	2,026,587	2,059,426	2,026,587	2,059,426
Ending balance: impaired loans	32,005	28,063	32,005	28,063
Ending balance: loans with general allowance	1,993,222	2,025,400	1,993,222	2,025,400
Consumer Loan [Member] | Purchased Credit Impaired [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Ending balance: purchased credit-impaired loans	0	0	0	0
Ending balance: purchased credit-impaired loans	$ 1,360	$ 5,963	$ 1,360	$ 5,963

[1] During the second quarter of 2013, after a comprehensive review of substantially all of the loans in our commercial portfolios, the classification of certain loans was revised to more accurately depict the nature of the underlying loans. This reclassification resulted in a net increase of $269.0 million in commercial mortgage loans, since the principal source of repayment for such loans is derived primarily from the operation of the underlying real estate, with a corresponding decrease of $246.8 million in commercial and industrial loans and a $22.2 million decrease in construction loans. The Corporation evaluated the impact of this reclassification on the provision for loan losses and determined that the effect of this adjustment was not material to any previously reported results.