SUPPLEMENTAL CASH FLOW INFORMATION - Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2015	Sep. 30, 2017	Sep. 30, 2016
Cash paid for:
Interest on borrowings				$ 68,869	$ 104,031
Income tax				3,205	1,878
Non-cash investing and financing activities:
Additions to other real estate owned				46,648	37,606
Additions to auto repossesions				33,113	42,934
Loan securitizations				200,236	238,599
Capitalization of servicing assets	$ 833	$ 1,420		2,757	3,878
Loans held for investment transferred to held for sale				0	10,332
Trust Preferred Securities Exchanged Liquidation Value			$ 5,300
Transfer Of Loans Held For Sale To Portfolio Loans 1				10,289	1,321
Property Plant And Equipment Transferred To Other Assets				$ 1,185	$ 0