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SERVICING RIGHTS - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 9 Months Ended | 15 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2018 | Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
MSRs sold |  | $ 0 | $ 0 | $ 28,549,000 | $ 39,186,000 |  |
Unpaid principal balances of conventional agency mortgage loans |  |  |  | 3,550,000,000 |  |  |
Proceeds from sale of mortgage servicing rights |  |  |  | 30,056,000 | 0 |  |
Gain on sale of mortgage servicing rights |  | 24,000 | 0 | (2,426,000) | 0 |  |
Unpaid principal balance |  | 223,600,000 |  | 223,600,000 |  |  | $ 3,940,000,000
Escrow balances |  | 479,000 |  | 479,000 |  |  | 17,800,000
Fair value of held-for-sale MSRs |  | 66,000 |  | $ 66,000 |  |  | 29,793,000
Discount rate |  |  |  | 9.25% |  |  |
Prepayment speed calculation percentage |  |  |  | 9.25% |  |  |
Banc Home Loan | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
MSRs sold | $ 37,800,000 | 0 | $ 0 | $ 0 | $ 37,772,000 | $ 37,772,000 |
SBA |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Unpaid principal balance |  | $ 99,000,000 |  | $ 99,000,000 |  |  | $ 101,000,000

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- Definition Continuing Involvement with Derecognized Transferred Financial Assets, Recorded Escrow Balance + References No definition available. + Details
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- Definition Gain (Loss) from Sale of Mortgage Servicing RIghts (MSR) + References No definition available. + Details
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- Definition Servicing Asset at Amortized Cost, Discount Rate + References No definition available. + Details
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- Definition Servicing Asset at Amortized Cost, Prepayment Speed Calculation, Percentage + References No definition available. + Details
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- Definition Servicing Asset at Fair Value, Amount, Held-For-Sale + References No definition available. + Details
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- Definition Transfer Of Financial Assets Accounting For As Sales, Principal Amount Outstanding + References No definition available. + Details
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- Definition Amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction that have been derecognized. Continuing involvement includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=109247956&loc=d3e107314-111719 + Details
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- Definition The cash inflow from the sale of servicing rights, which contractually entitle the servicer to receive fees and ancillary revenues for performing billing, collection, disbursement and recordkeeping services in connection with a mortgage portfolio. Rights may be obtained via (1) acquisition or assumption of a servicing obligation that does not relate to financial assets of the servicer or its consolidated affiliates; or (2) by originating mortgage loans and then (a) transferring the loans to a Variable Interest Entity (VIE) in a transaction that meets the necessary transfer and classification requirements, or (b) transferring the loans in a transaction that meets the requirements for sale accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7524895&loc=d3e120260-111741 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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