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ALLOWANCE FOR LOAN AND LEASE LOSSES - Carrying Amount of Portfolios (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016
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Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Impaired Financing Receivable With No Related Allowance Recorded Investment | $ 228,906 |  | $ 213,046 |  |  |
Impaired Financing Receivable With Related Allowance Recorded Investment | 559,104 |  | 577,262 |  |  |
Impaired Financing Receivable Related Allowance | 53,313 | $ 49,514 | 51,410 | $ 48,155 | $ 40,794 | $ 64,421
Loans And Leases Receivable Gross Carrying Amount | 8,716,953 |  | 8,850,476 | 8,877,214 |  |
Loans and Leases Receivable, Allowance | 200,563 | 222,035 | 231,843 | 230,870 | 173,485 | 205,603
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Allowance For Loan Losses | 11,354 | 11,354 | 11,251 | 10,235 | 9,446 | 6,857
PCI loans |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loans And Leases Receivable Gross Carrying Amount | 149,122 |  | 158,174 | 157,794 |  |
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Allowance For Loan Losses | 11,354 |  | 11,251 | 10,235 |  |
General Allowance [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loans And Leases Receivable Gross Carrying Amount | 7,779,821 |  | 7,901,994 | 7,940,161 |  |
Loans and Leases Receivable, Allowance | 135,896 |  | 169,182 | 172,480 |  |
Construction Loans [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Impaired Financing Receivable With No Related Allowance Recorded Investment | 1,116 |  | 48 |  |  |
Impaired Financing Receivable With Related Allowance Recorded Investment | 5,781 |  | 47,218 |  |  |
Impaired Financing Receivable Related Allowance | 906 |  | 2,017 | 1,865 |  |
Loans And Leases Receivable Gross Carrying Amount | 82,862 |  | 111,397 | 129,460 |  |
Loans and Leases Receivable, Allowance | 3,079 | 3,949 | 4,522 | 3,947 | 3,736 | 2,562
Construction Loans [Member] | PCI loans |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loans And Leases Receivable Gross Carrying Amount | 0 |  | 0 | 0 |  |
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Allowance For Loan Losses | 0 |  | 0 | 0 |  |
Construction Loans [Member] | General Allowance [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loans And Leases Receivable Gross Carrying Amount | 75,965 |  | 64,131 | 79,087 |  |
Loans and Leases Receivable, Allowance | 2,173 |  | 2,505 | 2,082 |  |
Residential Mortgage Loans |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Impaired Financing Receivable With No Related Allowance Recorded Investment | 117,375 |  | 116,818 |  |  |
Impaired Financing Receivable With Related Allowance Recorded Investment | 291,419 |  | 316,616 |  |  |
Impaired Financing Receivable Related Allowance | 18,482 |  | 22,086 | 19,417 |  |
Loans And Leases Receivable Gross Carrying Amount | 3,207,981 |  | 3,290,957 | 3,274,340 |  |
Loans and Leases Receivable, Allowance | 48,007 | 55,130 | 58,975 | 57,052 | 40,587 | 33,980
Residential Mortgage Loans | PCI loans |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loans And Leases Receivable Gross Carrying Amount | 145,203 |  | 153,991 | 153,609 |  |
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Allowance For Loan Losses | 10,954 |  | 10,873 | 9,863 |  |
Residential Mortgage Loans | General Allowance [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loans And Leases Receivable Gross Carrying Amount | 2,653,984 |  | 2,703,532 | 2,694,896 |  |
Loans and Leases Receivable, Allowance | 18,571 |  | 26,016 | 27,772 |  |
Residential Mortgage Loans | Construction Loans [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Impaired Financing Receivable With No Related Allowance Recorded Investment | 956 |  | 0 |  |  |
Impaired Financing Receivable With Related Allowance Recorded Investment | 809 |  | 252 |  |  |
Impaired Financing Receivable Related Allowance | 156 |  | 55 |  |  |
Commercial Portfolio Segment [Member] | Construction Loans [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Impaired Financing Receivable With No Related Allowance Recorded Investment | 0 |  | 0 |  |  |
Impaired Financing Receivable With Related Allowance Recorded Investment | 0 |  | 35,101 |  |  |
Impaired Financing Receivable Related Allowance | 0 |  | 560 |  |  |
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Impaired Financing Receivable With No Related Allowance Recorded Investment | 34,793 |  | 28,292 |  |  |
Impaired Financing Receivable With Related Allowance Recorded Investment | 62,361 |  | 90,008 |  |  |
Impaired Financing Receivable Related Allowance | 10,798 |  | 12,359 | 11,240 |  |
Loans And Leases Receivable Gross Carrying Amount | 2,068,256 |  | 2,083,253 | 2,144,236 |  |
Loans and Leases Receivable, Allowance | 44,166 | 44,000 | 48,871 | 40,379 | 42,082 | 61,953
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | PCI loans |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loans And Leases Receivable Gross Carrying Amount | 0 |  | 0 | 0 |  |
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Allowance For Loan Losses | 0 |  | 0 | 0 |  |
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | General Allowance [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loans And Leases Receivable Gross Carrying Amount | 1,971,102 |  | 1,964,953 | 2,033,297 |  |
Loans and Leases Receivable, Allowance | 33,368 |  | 36,512 | 29,139 |  |
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Impaired Financing Receivable With No Related Allowance Recorded Investment | 73,433 |  | 65,100 |  |  |
Impaired Financing Receivable With Related Allowance Recorded Investment | 169,787 |  | 87,814 |  |  |
Impaired Financing Receivable Related Allowance | 17,044 |  | 9,783 | 10,456 |  |
Loans And Leases Receivable Gross Carrying Amount | 1,506,502 |  | 1,614,972 | 1,601,638 |  |
Loans and Leases Receivable, Allowance | 49,270 | $ 48,718 | 48,493 | 55,943 | $ 38,576 | $ 57,261
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | PCI loans |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loans And Leases Receivable Gross Carrying Amount | 3,919 |  | 4,183 | 4,185 |  |
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Allowance For Loan Losses | 400 |  | 378 | 372 |  |
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | General Allowance [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loans And Leases Receivable Gross Carrying Amount | 1,259,363 |  | 1,457,875 | 1,443,578 |  |
Loans and Leases Receivable, Allowance | 31,826 |  | 38,332 | $ 45,115 |  |
Finance Leases [Member] | Consumer Loan [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Impaired Financing Receivable With No Related Allowance Recorded Investment | 2,189 |  | 2,788 |  |  |
Impaired Financing Receivable With Related Allowance Recorded Investment | 29,756 |  | 35,606 |  |  |
Impaired Financing Receivable Related Allowance | 6,083 |  | 5,165 |  |  |
Loans And Leases Receivable Gross Carrying Amount | 1,851,352 |  | 1,749,897 |  |  |
Loans and Leases Receivable, Allowance | 56,041 |  | 70,982 |  |  |
Finance Leases [Member] | Consumer Loan [Member] | PCI loans |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loans And Leases Receivable Gross Carrying Amount | 0 |  | 0 |  |  |
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Allowance For Loan Losses | 0 |  | 0 |  |  |
Finance Leases [Member] | Consumer Loan [Member] | General Allowance [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loans And Leases Receivable Gross Carrying Amount | 1,819,407 |  | 1,711,503 |  |  |
Loans and Leases Receivable, Allowance | $ 49,958 |  | $ 65,817 |  |  |

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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 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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