SUPPLEMENTAL CASH FLOW INFORMATION - Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Cash paid for:
Interest on borrowings	$ 25,935	$ 25,368
Income tax	1,070	3,412
Operating cash flow from operating leases	2,550	2,742
Non-cash investing and financing activities:
Additions to OREO	5,283	12,264
Additions to auto and other repossessed assets	12,785	11,587
Capitalization of servicing assets	904	868
Loan securitizations	60,903	51,034
Loans held for investment transferred to held for sale	3,535	1,775
Right-of-use assets obtained in exchange for operating lease liabilities	274	0
Unsettled sales of available-for-sale investment securities	284,201	0
Adoption of lease accounting standard:
Right-of-use assets operating leases	59,488		$ 61,327
Operating lease liability	62,509		$ 64,259
ASU 2016-02 [Member]
Adoption of lease accounting standard:
Right-of-use assets operating leases	0	57,178
Operating lease liability	$ 0	$ 59,818