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LOAN PORTFOLIO- Carrying Value of Purchased Credit Impaired Loans (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | ---
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | $ 9,113,955 |  | $ 8,858,123 | $ 8,640,291 |  |
Residential Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | 3,070,746 |  | 3,163,208 | 3,238,001 |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | 3,930,293 |  | 3,750,202 |  |  |
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | 1,550,364 |  | 1,522,662 | 1,533,308 |  |
PCI loans |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | 141,706 | $ 144,443 | 146,640 | 152,242 | $ 155,281 | $ 158,174
Allowance for loan losses Purchased Credit Impaired | (11,434) | $ (11,354) | (11,354) | (11,354) | $ (11,251) | $ (11,251)
Purchased Credit Impaired Loans, Net | 130,272 |  | 135,286 | 140,888 |  |
PCI loans | Residential Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | 138,367 |  | 143,176 | 148,025 |  |
Allowance for loan losses Purchased Credit Impaired | (11,063) |  | (10,954) | (10,954) |  |
PCI loans | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | 3,339 |  | 3,464 | 4,217 |  |
Allowance for loan losses Purchased Credit Impaired | $ (371) |  | $ (400) | $ (400) |  |

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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 The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 Reference 2: 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 + 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 before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes 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 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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