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SERVICING RIGHTS - Summary of Key Characteristics, Inputs and Economic Assumptions Used to Estimate Fair Value of SBA Servicing Rights (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Servicing Assets at Fair Value [Line Items] |  |  |  |
Mortgage servicing rights, at fair value | $ 1,770 | $ 31,852 | $ 76,121 | $ 49,939
Significant Unobservable Inputs (Level 3) |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |
Mortgage servicing rights, at fair value | $ 1,704 | $ 2,059 |  |
Discount rate | 13.00% | 13.00% |  |
Constant prepayment rate | 17.21% | 16.54% |  |
Weighted-average life | 4 years 11 months 4 days | 5 years 27 days |  |
Significant Unobservable Inputs (Level 3) | SBA |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |
Mortgage servicing rights, at fair value | $ 1,658 | $ 1,856 |  |
Discount rate | 9.50% | 8.50% |  |
Constant prepayment rate | 8.00% | 8.00% |  |
Weighted-average life | 4 years 3 months 14 days | 4 years 6 months 14 days |  |

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- Definition Discount rate which is used to value residual cash flows generated by financial assets of the securitization, asset-backed financing arrangement, or similar transfer for initial fair value measurement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109247956&loc=d3e107207-111719 + Details
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- Definition Estimated rate of prepayment of principal on financial assets for initial fair value measurement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109247956&loc=d3e107207-111719 + Details
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- Definition Weighted average life of securitized assets for initial fair value measurement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109247956&loc=d3e107207-111719 + Details
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- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122625-111746 + Details
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