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ALLOWANCE FOR LOAN AND LEASE LOSSES - Changes in Allowance for Loan and Lease Losses (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Beginning balance |  | $ 205,603 |  | $ 240,710 |  |  |
Charge-offs |  | (134,770) |  | (136,928) |  |  |
Recoveries |  | 16,756 |  | 15,088 |  |  |
Provision (release) |  | 144,254 |  | 86,733 |  |  |
Ending balance |  | 231,843 |  | 205,603 |  |  |
Related Allowance |  | 51,410 |  | 64,421 |  | $ 52,581 | $ 55,205
Ending balance: purchased credit-impaired loans |  | 11,251 |  | 6,857 |  |  |
Ending balance: general allowance |  | 169,182 |  | 134,325 |  |  |
Ending balance |  | 8,850,476 |  | 8,886,873 |  |  |
Ending balance: impaired loans |  | 790,308 |  | 887,905 |  | $ 806,509 | $ 945,407
Ending balance: purchased credit-impaired loans |  | 158,174 | [1] | 165,818 | [2] |  |
Ending balance: loans with general allowance |  | 7,901,994 |  | 7,833,150 |  |  |
Purchased Credit Impaired [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Ending balance: purchased credit-impaired loans | [3] | 11,251 |  | 6,857 |  |  |
Residential Mortgage [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 33,980 |  | 39,570 |  |  |
Charge-offs |  | (28,186) |  | (33,621) |  |  |
Recoveries |  | 2,437 |  | 2,941 |  |  |
Provision (release) |  | 50,744 |  | 25,090 |  |  |
Ending balance |  | 58,975 |  | 33,980 |  |  |
Related Allowance |  | 22,086 |  | 8,633 |  |  |
Ending balance: general allowance |  | 26,016 |  | 18,715 |  |  |
Ending balance |  | 3,290,957 |  | 3,296,031 |  |  |
Ending balance: impaired loans |  | 433,434 |  | 442,267 |  |  |
Ending balance: purchased credit-impaired loans |  | 153,991 |  | 162,676 |  |  |
Ending balance: loans with general allowance |  | 2,703,532 |  | 2,691,088 |  |  |
Residential Mortgage [Member] | Purchased Credit Impaired [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Ending balance: purchased credit-impaired loans | [3] | 10,873 |  | 6,632 |  |  |
Commercial Mortgage Loans [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 57,261 |  | 68,211 |  |  |
Charge-offs |  | (39,092) |  | (20,454) |  |  |
Recoveries |  | 270 |  | 816 |  |  |
Provision (release) |  | 30,054 |  | 8,688 |  |  |
Ending balance |  | 48,493 |  | 57,261 |  |  |
Related Allowance |  | 9,783 |  | 26,172 |  |  |
Ending balance: general allowance |  | 38,332 |  | 30,864 |  |  |
Ending balance |  | 1,614,972 |  | 1,568,808 |  |  |
Ending balance: impaired loans |  | 152,914 |  | 194,391 |  |  |
Ending balance: purchased credit-impaired loans |  | 4,183 |  | 3,142 |  |  |
Ending balance: loans with general allowance |  | 1,457,875 |  | 1,371,275 |  |  |
Commercial Mortgage Loans [Member] | Purchased Credit Impaired [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Ending balance: purchased credit-impaired loans | [3] | 378 |  | 225 |  |  |
Commercial And Industrial Loans [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 61,953 |  | 68,768 |  |  |
Charge-offs |  | (19,855) |  | (26,579) |  |  |
Recoveries |  | 5,755 |  | 2,689 |  |  |
Provision (release) |  | 1,018 |  | 17,075 |  |  |
Ending balance |  | 48,871 |  | 61,953 |  |  |
Related Allowance |  | 12,359 |  | 22,638 |  |  |
Ending balance: general allowance |  | 36,512 |  | 39,315 |  |  |
Ending balance |  | 2,083,253 |  | 2,180,455 |  |  |
Ending balance: impaired loans |  | 118,300 |  | 153,543 |  |  |
Ending balance: purchased credit-impaired loans |  | 0 |  | 0 |  |  |
Ending balance: loans with general allowance |  | 1,964,953 |  | 2,026,912 |  |  |
Commercial And Industrial Loans [Member] | Purchased Credit Impaired [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Ending balance: purchased credit-impaired loans | [3] | 0 |  | 0 |  |  |
Construction Loans [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 2,562 |  | 3,519 |  |  |
Charge-offs |  | (3,607) |  | (1,770) |  |  |
Recoveries |  | 732 |  | 316 |  |  |
Provision (release) |  | 4,835 |  | 497 |  |  |
Ending balance |  | 4,522 |  | 2,562 |  |  |
Related Allowance |  | 2,017 |  | 1,405 |  |  |
Ending balance: general allowance |  | 2,505 |  | 1,157 |  |  |
Ending balance |  | 111,397 |  | 124,951 |  |  |
Ending balance: impaired loans |  | 47,266 |  | 53,291 |  |  |
Ending balance: purchased credit-impaired loans |  | 0 |  | 0 |  |  |
Ending balance: loans with general allowance |  | 64,131 |  | 71,660 |  |  |
Construction Loans [Member] | Purchased Credit Impaired [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Ending balance: purchased credit-impaired loans | [3] | 0 |  | 0 |  |  |
Consumer Loan [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 49,847 |  | 60,642 |  |  |
Charge-offs |  | (44,030) |  | (54,504) |  |  |
Recoveries |  | 7,562 |  | 8,326 |  |  |
Provision (release) |  | 57,603 |  | 35,383 |  |  |
Ending balance |  | 70,982 |  | 49,847 |  |  |
Related Allowance |  | 5,165 |  | 5,573 |  |  |
Ending balance: general allowance |  | 65,817 |  | 44,274 |  |  |
Ending balance |  | 1,749,897 |  | 1,716,628 |  |  |
Ending balance: impaired loans |  | 38,394 |  | 44,413 |  |  |
Ending balance: purchased credit-impaired loans |  | 0 |  | 0 |  |  |
Ending balance: loans with general allowance |  | 1,711,503 |  | 1,672,215 |  |  |
Consumer Loan [Member] | Purchased Credit Impaired [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Ending balance: purchased credit-impaired loans | [3] | $ 0 |  | $ 0 |  |  |
[1] | According to the Corporation's delinquency policy and consistent with the instructions for the preparation of the Consolidated Financial Statements for Bank Holding Companies (FR Y-9C) required by the Federal Reserve Board, residential mortgage and commercial mortgage loans are considered past due when the borrower is in arrears two or more monthly payments. PCI residential mortgage loans and commercial mortgage loans past due 30-59 days as of December 31, 2017 amounted to $28.1 million and $0.2 million, respectively.
[2] | According to the Corporation's delinquency policy and consistent with the instructions for the preparation of the Consolidated Financial Statements for Bank Holding Companies (FR Y-9C) required by the Federal Reserve Board, residential mortgage and commercial mortgage loans are considered past due when the borrower is in arrears two or more monthly payments. PCI residential mortgage loans and commercial mortgage loans past due 30-59 days as of December 31, 2016 amounted to $22.3 million and $0.1 million, respectively.
[3] | Refer to Note 9 - Loans Held for Investment - PCI Loans for additional information about changes in the allowance for loan losses related to PCI loans.

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- Definition The recorded balance for loans accounted for as debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References No definition available. + Details
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- Definition Reserve for loans impairments recorded after acquisition as a result of current information and events which result in it being probable that estimated cash flows will be less than previously expected or because actual cash flows are less than cash flows previously expected. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538 + Details
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