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ALLOWANCE FOR LOAN AND LEASE LOSSES - Carrying Amount of Portfolios (Detail) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Impaired Financing Receivable With No Related Allowance Recorded Investment | $ 219,107 | $ 188,397 |  |  |  |
Impaired Financing Receivable With Related Allowance Recorded Investment | 492,721 | 571,872 |  |  |  |
Impaired Financing Receivable Related Allowance | 36,835 | 53,976 |  | $ 49,514 |  |
Loans and Leases Receivable, Gross | 9,113,955 | 8,858,123 |  | 8,640,291 |  |
Loans and Leases Receivable, Allowance | $ 172,011 | $ 196,362 | $ 183,732 | 222,035 | $ 225,856 | $ 231,843
Allowance for loan and lease losses, numerator [Member] | Impaired principal balance, denominator [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses to principal balance | 7.48% | 9.44% |  |  |  |
Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses to principal balance | 1.89% | 2.22% |  |  |  |
PCI loans |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | $ 141,706 | $ 146,640 | 144,443 | 152,242 | 155,281 | 158,174
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Allowance For Loan Losses | $ 11,434 | $ 11,354 | 11,354 | 11,354 | 11,251 | 11,251
PCI loans | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses to principal balance | 8.07% | 7.74% |  |  |  |
General Allowance [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | $ 8,260,421 | $ 7,951,214 |  | 7,747,915 |  |
Loans and Leases Receivable, Allowance | $ 123,742 | $ 131,032 |  | 161,167 |  |
General Allowance [Member] | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses to principal balance | 1.50% | 1.65% |  |  |  |
Residential Mortgage Loans [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Impaired Financing Receivable With No Related Allowance Recorded Investment | $ 106,195 | $ 110,238 |  |  |  |
Impaired Financing Receivable With Related Allowance Recorded Investment | 284,821 | 293,494 |  |  |  |
Impaired Financing Receivable Related Allowance | 18,788 | 19,965 |  | 19,804 |  |
Loans and Leases Receivable, Gross | 3,070,746 | 3,163,208 |  | 3,238,001 |  |
Loans and Leases Receivable, Allowance | $ 48,284 | $ 50,794 | 51,886 | 55,130 | 56,386 | 58,975
Residential Mortgage Loans [Member] | Allowance for loan and lease losses, numerator [Member] | Impaired principal balance, denominator [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses to principal balance | 6.60% | 6.80% |  |  |  |
Residential Mortgage Loans [Member] | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses to principal balance | 1.57% | 1.61% |  |  |  |
Residential Mortgage Loans [Member] | PCI loans |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | $ 138,367 | $ 143,176 |  | 148,025 |  |
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Allowance For Loan Losses | $ 11,063 | $ 10,954 |  | 10,954 |  |
Residential Mortgage Loans [Member] | PCI loans | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses to principal balance | 8.00% | 7.65% |  |  |  |
Residential Mortgage Loans [Member] | General Allowance [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | $ 2,541,363 | $ 2,616,300 |  | 2,680,891 |  |
Loans and Leases Receivable, Allowance | $ 18,433 | $ 19,875 |  | 24,372 |  |
Residential Mortgage Loans [Member] | General Allowance [Member] | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses to principal balance | 0.73% | 0.76% |  |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | $ 3,930,293 | $ 3,750,202 |  |  |  |
Commercial Portfolio Segment [Member] | Construction Loans [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Impaired Financing Receivable With No Related Allowance Recorded Investment | 3,245 | 2,431 |  |  |  |
Impaired Financing Receivable With Related Allowance Recorded Investment | 2,784 | 4,162 |  |  |  |
Impaired Financing Receivable Related Allowance | 574 | 760 |  | 1,061 |  |
Loans and Leases Receivable, Gross | 100,244 | 79,429 |  | 84,683 |  |
Loans and Leases Receivable, Allowance | $ 3,026 | $ 3,592 | 3,331 | 3,949 | 4,122 | 4,522
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Allowance for loan and lease losses, numerator [Member] | Impaired principal balance, denominator [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses to principal balance | 20.62% | 18.26% |  |  |  |
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses to principal balance | 3.02% | 4.52% |  |  |  |
Commercial Portfolio Segment [Member] | Construction Loans [Member] | PCI loans |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | $ 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] | Construction Loans [Member] | General Allowance [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | 94,215 | 72,836 |  | 73,422 |  |
Loans and Leases Receivable, Allowance | $ 2,452 | $ 2,832 |  | 2,888 |  |
Commercial Portfolio Segment [Member] | Construction Loans [Member] | General Allowance [Member] | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses to principal balance | 2.60% | 3.89% |  |  |  |
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 | $ 28,854 | $ 30,030 |  |  |  |
Impaired Financing Receivable With Related Allowance Recorded Investment | 51,283 | 61,162 |  |  |  |
Impaired Financing Receivable Related Allowance | 3,880 | 9,693 |  | 10,592 |  |
Loans and Leases Receivable, Gross | 2,279,685 | 2,148,111 |  | 2,009,049 |  |
Loans and Leases Receivable, Allowance | $ 21,644 | $ 32,546 | 22,321 | 44,000 | 47,659 | 48,871
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | Allowance for loan and lease losses, numerator [Member] | Impaired principal balance, denominator [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses to principal balance | 7.57% | 15.85% |  |  |  |
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses to principal balance | 0.95% | 1.52% |  |  |  |
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | PCI loans |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | $ 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 | 2,199,548 | 2,056,919 |  | 1,897,678 |  |
Loans and Leases Receivable, Allowance | $ 17,764 | $ 22,853 |  | 33,408 |  |
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | General Allowance [Member] | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses to principal balance | 0.81% | 1.11% |  |  |  |
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Impaired Financing Receivable With No Related Allowance Recorded Investment | $ 79,600 | $ 43,358 |  |  |  |
Impaired Financing Receivable With Related Allowance Recorded Investment | 127,909 | 184,068 |  |  |  |
Impaired Financing Receivable Related Allowance | 9,023 | 17,684 |  | 12,204 |  |
Loans and Leases Receivable, Gross | 1,550,364 | 1,522,662 |  | 1,533,308 |  |
Loans and Leases Receivable, Allowance | $ 46,373 | $ 55,581 | 53,430 | 48,718 | 50,393 | 48,493
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Allowance for loan and lease losses, numerator [Member] | Impaired principal balance, denominator [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses to principal balance | 7.05% | 9.61% |  |  |  |
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses to principal balance | 2.99% | 3.65% |  |  |  |
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | PCI loans |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | $ 3,339 | $ 3,464 |  | 4,217 |  |
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Allowance For Loan Losses | $ 371 | $ 400 |  | 400 |  |
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | PCI loans | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses to principal balance | 11.11% | 11.55% |  |  |  |
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | General Allowance [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | $ 1,339,516 | $ 1,291,772 |  | 1,353,516 |  |
Loans and Leases Receivable, Allowance | $ 36,979 | $ 37,497 |  | 36,114 |  |
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | General Allowance [Member] | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses to principal balance | 2.76% | 2.90% |  |  |  |
Consumer Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Impaired Financing Receivable With No Related Allowance Recorded Investment | $ 1,213 | $ 2,340 |  |  |  |
Impaired Financing Receivable With Related Allowance Recorded Investment | 25,924 | 28,986 |  |  |  |
Impaired Financing Receivable Related Allowance | 4,570 | 5,874 |  | 5,853 |  |
Loans and Leases Receivable, Gross | 2,112,916 | 1,944,713 |  | 1,775,250 |  |
Loans and Leases Receivable, Allowance | $ 52,684 | $ 53,849 | $ 52,764 | 70,238 | $ 67,296 | $ 70,982
Consumer Portfolio Segment [Member] | Allowance for loan and lease losses, numerator [Member] | Impaired principal balance, denominator [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses to principal balance | 17.63% | 20.26% |  |  |  |
Consumer Portfolio Segment [Member] | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses to principal balance | 2.49% | 2.77% |  |  |  |
Consumer Portfolio Segment [Member] | PCI loans |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | $ 0 | $ 0 |  | 0 |  |
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Allowance For Loan Losses | 0 | 0 |  | 0 |  |
Consumer Portfolio Segment [Member] | General Allowance [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | 2,085,779 | 1,913,387 |  | 1,742,408 |  |
Loans and Leases Receivable, Allowance | $ 48,114 | $ 47,975 |  | $ 64,385 |  |
Consumer Portfolio Segment [Member] | General Allowance [Member] | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses to principal balance | 2.31% | 2.51% |  |  |  |

X
- 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 For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13531-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13537-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + 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 for credit losses related to recorded investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
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