SUPPLEMENTAL CASH FLOW INFORMATION - Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Jun. 30, 2015	Mar. 31, 2015
Cash paid for:
Interest on borrowings	$ 23,148		$ 24,502
Income tax	0		82
Non-cash investing and financing activities:
Additions to other real estate owned	9,145		12,702
Additions to auto repossesions	14,873		20,464
Loan securitizations	67,728		46,914
Capitalization of servicing assets	1,161		1,073
Trust Preferred Securities Exchanged Liquidation Value		$ 5,300
Deposits [Member]
Non-cash investing and financing activities:
Liabilities Assumed1	0		(523,517)
Loans [Member]
Non-cash investing and financing activities:
Fair Value Of Assets Acquired	0		311,410
Property Plant And Equipment [Member]
Non-cash investing and financing activities:
Fair Value Of Assets Acquired	0		5,450
Core Deposits [Member]
Non-cash investing and financing activities:
Fair Value Of Assets Acquired	$ 0		$ 5,820