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INVESTMENT SECURITIES - Significant Assumptions in Valuation of Private Label MBS (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Schedule Of Investments [Line Items] |  |
Fair Value Inputs Discount Rate | 14.00% | 14.10%
Fair Value Inputs Prepayment Rate | 16.40% | 13.80%
Weighted Average, Projected Cumulative Loss Rate | 3.00% | 4.00%
Minimum [Member] |  |
Schedule Of Investments [Line Items] |  |
Fair Value Inputs Discount Rate |  | 12.88%
Fair Value Inputs Prepayment Rate | 12.00% | 6.50%
Weighted Average, Projected Cumulative Loss Rate | 0.00% | 0.20%
Maximum [Member] |  |
Schedule Of Investments [Line Items] |  |
Fair Value Inputs Discount Rate |  | 14.43%
Fair Value Inputs Prepayment Rate | 29.00% | 22.50%
Weighted Average, Projected Cumulative Loss Rate | 6.80% | 8.50%

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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Loss, including interest and principal, incurred on a defaulted security, expressed as a percentage of the original principal balance, used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Rate at which loans or a loan portfolio are expected to prepay principal balances, used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + 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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