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NON-CONSOLIDATED VARIABLE INTEREST ENTITIES AND SERVICING ASSETS - Weighted-Averages of Key Economic Assumptions in Valuation Model (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Transfers and Servicing [Abstract]
Carrying amount of servicing assets	$ 27,231	$ 27,431	$ 27,428	$ 27,191	$ 26,135	$ 25,255
Fair value	$ 30,396
Weighted-average expected life	8 years 3 months 25 days
Constant prepayment rate	6.48%
Decrease in fair value due to 10% adverse change, constant prepayment rate	$ 750
Decrease in fair value due to 20% adverse change, constant prepayment rate	$ 1,468
Discount rate	11.26%
Decrease in fair value due to 10% adverse change, discount rate	$ 1,427
Decrease in fair value due to 20% adverse change, discount rate	$ 2,739

X

- Definition

The hypothetical financial impact of a 10 percent adverse change of the discount rate on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

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The hypothetical financial impact of a 10 percent adverse change of prepayment speed on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

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Amortized amount of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

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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.

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Estimated rate of prepayments of principal on servicing assets and servicing liabilities.

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Weighted average life of financial assets and financial liabilities, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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