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ALLOWANCE FOR LOAN AND LEASE LOSSES - Changes in Allowance for Loan and Lease Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Beginning balance | $ 222,035 | $ 173,485 | $ 231,843 | $ 205,603 |  |  |  |
Charge-offs | (36,312) | (19,369) | (93,368) | (107,751) |  |  |  |
Recoveries | 3,316 | 1,741 | 10,484 | 14,467 |  |  |  |
Provision | 11,524 | 75,013 | 51,604 | 118,551 |  |  |  |
Ending balance | 200,563 | 230,870 | 200,563 | 230,870 |  |  |  |
Ending balance: specific reserve for impaired loans | 53,313 | 48,155 | 53,313 | 48,155 | $ 49,514 | $ 51,410 | $ 40,794 | $ 64,421
Ending balance: purchased credit impaired loans | 11,354 | 10,235 | 11,354 | 10,235 | 11,354 | 11,251 | 9,446 | 6,857
Ending balance | 8,716,953 | 8,877,214 | 8,716,953 | 8,877,214 |  | 8,850,476 |  |
Ending balance: impaired loans | 788,010 | 779,259 | 788,010 | 779,259 | $ 740,134 | 790,308 | $ 735,625 | $ 887,905
General Allowance [Member] |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Beginning balance |  |  | 169,182 |  |  |  |  |
Ending balance | 135,896 | 172,480 | 135,896 | 172,480 |  |  |  |
Ending balance | 7,779,821 | 7,940,161 | 7,779,821 | 7,940,161 |  | 7,901,994 |  |
PCI loans |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Ending balance: purchased credit impaired loans | 11,354 | 10,235 | 11,354 | 10,235 |  | 11,251 |  |
Ending balance | 149,122 | 157,794 | 149,122 | 157,794 |  | 158,174 |  |
Residential Portfolio Segment [Member] |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Beginning balance | 55,130 | 40,587 | 58,975 | 33,980 |  |  |  |
Charge-offs | (8,316) | (7,177) | (17,231) | (22,369) |  |  |  |
Recoveries | 833 | 321 | 1,857 | 1,961 |  |  |  |
Provision | 360 | 23,321 | 4,406 | 43,480 |  |  |  |
Ending balance | 48,007 | 57,052 | 48,007 | 57,052 |  |  |  |
Ending balance: specific reserve for impaired loans | 18,482 | 19,417 | 18,482 | 19,417 |  | 22,086 |  |
Ending balance | 3,207,981 | 3,274,340 | 3,207,981 | 3,274,340 |  | 3,290,957 |  |
Ending balance: impaired loans | 408,794 | 425,835 | 408,794 | 425,835 |  |  |  |
Residential Portfolio Segment [Member] | General Allowance [Member] |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Beginning balance |  |  | 26,016 |  |  |  |  |
Ending balance | 18,571 | 27,772 | 18,571 | 27,772 |  |  |  |
Ending balance | 2,653,984 | 2,694,896 | 2,653,984 | 2,694,896 |  | 2,703,532 |  |
Residential Portfolio Segment [Member] | PCI loans |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Ending balance: purchased credit impaired loans | 10,954 | 9,863 | 10,954 | 9,863 |  | 10,873 |  |
Ending balance | 145,203 | 153,609 | 145,203 | 153,609 |  | 153,991 |  |
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Beginning balance | 48,718 | 38,576 | 48,493 | 57,261 |  |  |  |
Charge-offs | (9,850) | (266) | (20,557) | (32,123) |  |  |  |
Recoveries | 291 | 43 | 378 | 151 |  |  |  |
Provision | 10,111 | 17,590 | 20,956 | 30,654 |  |  |  |
Ending balance | 49,270 | 55,943 | 49,270 | 55,943 |  |  |  |
Ending balance: specific reserve for impaired loans | 17,044 | 10,456 | 17,044 | 10,456 |  | 9,783 |  |
Ending balance | 1,506,502 | 1,601,638 | 1,506,502 | 1,601,638 |  | 1,614,972 |  |
Ending balance: impaired loans | 243,220 | 153,875 | 243,220 | 153,875 |  | 152,914 |  |
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | General Allowance [Member] |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Beginning balance |  |  | 38,332 |  |  |  |  |
Ending balance | 31,826 | 45,115 | 31,826 | 45,115 |  |  |  |
Ending balance | 1,259,363 | 1,443,578 | 1,259,363 | 1,443,578 |  | 1,457,875 |  |
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | PCI loans |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Ending balance: purchased credit impaired loans | 400 | 372 | 400 | 372 |  | 378 |  |
Ending balance | 3,919 | 4,185 | 3,919 | 4,185 |  | 4,183 |  |
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Beginning balance | 44,000 | 42,082 | 48,871 | 61,953 |  |  |  |
Charge-offs | (2,242) | (738) | (9,282) | (19,168) |  |  |  |
Recoveries | 127 | 114 | 1,565 | 5,613 |  |  |  |
Provision | 2,281 | (1,079) | 3,012 | (8,019) |  |  |  |
Ending balance | 44,166 | 40,379 | 44,166 | 40,379 |  |  |  |
Ending balance: specific reserve for impaired loans | 10,798 | 11,240 | 10,798 | 11,240 |  | 12,359 |  |
Ending balance | 2,068,256 | 2,144,236 | 2,068,256 | 2,144,236 |  | 2,083,253 |  |
Ending balance: impaired loans | 97,154 | 110,939 | 97,154 | 110,939 |  | 118,300 |  |
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | General Allowance [Member] |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Beginning balance |  |  | 36,512 |  |  |  |  |
Ending balance | 33,368 | 29,139 | 33,368 | 29,139 |  |  |  |
Ending balance | 1,971,102 | 2,033,297 | 1,971,102 | 2,033,297 |  | 1,964,953 |  |
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | PCI loans |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Ending balance: purchased credit impaired loans | 0 | 0 | 0 | 0 |  | 0 |  |
Ending balance | 0 | 0 | 0 | 0 |  | 0 |  |
Consumer Portfolio Segment [Member] |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Beginning balance | 70,238 | 48,504 | 70,982 | 49,847 |  |  |  |
Charge-offs | (13,712) | (11,141) | (38,111) | (33,386) |  |  |  |
Recoveries | 2,051 | 1,247 | 6,519 | 6,148 |  |  |  |
Provision | (2,536) | 34,939 | 16,651 | 50,940 |  |  |  |
Ending balance | 56,041 | 73,549 | 56,041 | 73,549 |  |  |  |
Ending balance: specific reserve for impaired loans | 6,083 | 5,177 | 6,083 | 5,177 |  |  |  |
Ending balance | 1,851,352 | 1,727,540 | 1,851,352 | 1,727,540 |  |  |  |
Ending balance: impaired loans | 31,945 | 38,237 | 31,945 | 38,237 |  |  |  |
Consumer Portfolio Segment [Member] | General Allowance [Member] |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Ending balance | 49,958 | 68,372 | 49,958 | 68,372 |  |  |  |
Ending balance | 1,819,407 | 1,689,303 | 1,819,407 | 1,689,303 |  |  |  |
Consumer Portfolio Segment [Member] | PCI loans |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Ending balance: purchased credit impaired loans | 0 | 0 | 0 | 0 |  |  |  |
Ending balance | 0 | 0 | 0 | 0 |  |  |  |
Construction Loans [Member] |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Beginning balance | 3,949 | 3,736 | 4,522 | 2,562 |  |  |  |
Charge-offs | (2,192) | (47) | (8,187) | (705) |  |  |  |
Recoveries | 14 | 16 | 165 | 594 |  |  |  |
Provision | 1,308 | 242 | 6,579 | 1,496 |  |  |  |
Ending balance | 3,079 | 3,947 | 3,079 | 3,947 |  |  |  |
Ending balance: specific reserve for impaired loans | 906 | 1,865 | 906 | 1,865 |  | 2,017 |  |
Ending balance | 82,862 | 129,460 | 82,862 | 129,460 |  | 111,397 |  |
Ending balance: impaired loans | 6,897 | 50,373 | 6,897 | 50,373 |  |  |  |
Construction Loans [Member] | General Allowance [Member] |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Beginning balance |  |  | 2,505 |  |  |  |  |
Ending balance | 2,173 | 2,082 | 2,173 | 2,082 |  |  |  |
Ending balance | 75,965 | 79,087 | 75,965 | 79,087 |  | 64,131 |  |
Construction Loans [Member] | PCI loans |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Ending balance: purchased credit impaired loans | 0 | 0 | 0 | 0 |  | 0 |  |
Ending balance | 0 | $ 0 | 0 | $ 0 |  | 0 |  |
Construction Loans [Member] | Residential Portfolio Segment [Member] |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Ending balance: specific reserve for impaired loans | 156 |  | 156 |  |  | 55 |  |
Ending balance: impaired loans | 1,765 |  | 1,765 |  |  | 252 |  |
Construction Loans [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Ending balance: specific reserve for impaired loans | 0 |  | 0 |  |  | 560 |  |
Ending balance: impaired loans | $ 0 |  | $ 0 |  |  | $ 35,101 |  |

X
- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + 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://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 + Details
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