SUPPLEMENTAL CASH FLOW INFORMATION - Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Cash paid for:
Interest on borrowings			$ 50,316	$ 52,089
Income tax			10,597	6,825
Operating cash flow from operating leases			5,119	4,876
Non-cash investing and financing activities:
Additions to OREO			5,524	20,138
Additions to auto and other repossessed assets			16,282	21,705
Capitalization of servicing assets	$ 666	$ 1,001	1,570	1,869
Loan securitizations			84,876	115,019
Loans held for investment transferred to held for sale			3,535	10,114
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability			274	2,418
Adoption of lease accounting standard:
Right-of-use assets operating leases	57,364		57,364		$ 61,327
Operating Lease, Liability	60,445		60,445		$ 64,259
ASU 2016-02 [Member]
Adoption of lease accounting standard:
Right-of-use assets operating leases	0	57,178	0	57,178
Operating Lease, Liability	$ 0	$ 59,818	$ 0	$ 59,818