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FAIR VALUE MEASUREMENTS - Information about Significant Unobservable Inputs Used for Recurring Fair Value Measurements for Level 3 MSRs (Detail) - Fair Value, Measurements, Recurring - Level 3 - Mortgage Servicing Rights - USD ($) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2019 | Dec. 31, 2018
Minimum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Unobservable input, discount rate | 9.00% | 9.00%
Unobservable input, prepayment rate | 5.30% | 4.70%
Unobservable input, delinquency rate | 0.00% | 0.00%
Unobservable input, cost to service | $ 82 | $ 82
Maximum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Unobservable input, discount rate | 12.00% | 12.00%
Unobservable input, prepayment rate | 23.60% | 13.90%
Unobservable input, delinquency rate | 5.00% | 5.00%
Unobservable input, cost to service | $ 139 | $ 138
Weighted Average |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Unobservable input, discount rate | 9.40% | 9.40%
Unobservable input, prepayment rate | 11.50% | 8.00%
Unobservable input, delinquency rate | 2.30% | 2.30%
Unobservable input, cost to service | $ 110 | $ 110

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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 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 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 Percentage of likelihood a loan will not be repaid and instead default, 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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