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FAIR VALUE MEASUREMENTS - Summary of Financial Assets and Financial Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Assets
Loans held for sale	$ 1,186,577	$ 787,035
Pledged securities	121,495	121,767	$ 117,566	$ 116,331
Derivative assets	158,233	15,568
Liabilities
Derivative liabilities	172,623	36
Recurring
Assets
Loans held for sale	1,186,577	787,035
Pledged securities	121,495	121,767
Derivative assets	158,233	15,568
Total financial assets	1,466,305	924,370
Liabilities
Derivative liabilities	172,623	36
Total financial liabilities	172,623	36
Level 1 \| Recurring
Assets
Pledged securities	8,543	7,204
Total financial assets	8,543	7,204
Level 2 \| Recurring
Assets
Loans held for sale	1,186,577	787,035
Pledged securities	112,952	114,563
Total financial assets	1,299,529	901,598
Level 3 \| Recurring
Assets
Derivative assets	158,233	15,568
Total financial assets	158,233	15,568
Liabilities
Derivative liabilities	172,623	36
Total financial liabilities	$ 172,623	$ 36