SUPPLEMENTAL CASH FLOW INFORMATION - Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Feb. 27, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash paid for:
Interest on borrowings		$ 127,707	$ 93,053	$ 102,402
Income tax		3,198	4,494	7,751
Non-cash investing and financing activities:
Additions to other real estate owned		47,808	76,725	48,601
Additions to repossed properties		52,628	75,279	92,266
Loan securitizations		338,333	285,995	198,712
Loans held for investment transferred to held for sale		10,332	0	0
Capitalization of servicing assets		5,260	4,919	4,321
Other Assets Held For Sale		1,221	0	0
Exchange of preferred stock-Series A through E		0	0	26,022
Common Stock Issued In Exchange For Trust Preferred Securities Value		0	5,628	0
Trust Preferred Securities Exchanged Liquidation Value		0	5,303	0
Transfer Of Loans Held For Sale To Portfolio Loans 1		1,443	40,086	0
Fair Value Of Assets Acquired	$ 540,339
Deposits [Member]
Non-cash investing and financing activities:
Liabilities Assumed1	(523,517)	0	(523,517)	0
Loans [Member]
Non-cash investing and financing activities:
Fair Value Of Assets Acquired	311,410	0	311,410	0
Property Plant And Equipment [Member]
Non-cash investing and financing activities:
Fair Value Of Assets Acquired	5,450	0	5,450	0
Cash [Member]
Non-cash investing and financing activities:
Fair Value Of Assets Acquired	217,659
Core Deposits [Member]
Non-cash investing and financing activities:
Fair Value Of Assets Acquired	5,820	0	5,820	0
Other Liabilities [Member]
Non-cash investing and financing activities:
Liabilities Assumed1	$ (3,379)
Preferred Stock [Member]
Non-cash investing and financing activities:
Exchange of preferred stock-Series A through E		0	0	26,943
Common Stock [Member]
Non-cash investing and financing activities:
New stock issued		0	0	24,363
Common Stock Issued In Exchange For Trust Preferred Securities Value		$ 0	$ 85	$ 0