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SUPPLEMENTAL CASH FLOW INFORMATION - Supplemental Cash Flow Information (Detail) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Feb. 27, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash paid for:        
Interest on borrowings   $ 93,634 $ 127,707 $ 93,053
Income tax   4,037 3,198 4,494
Non-cash investing and financing activities:        
Additions to other real estate owned   47,711 47,808 76,725
Additions to repossed properties   40,987 52,628 75,279
Loan securitizations   235,074 338,333 285,995
Loans held for investment transferred to held for sale   0 10,332 0
Capitalization of servicing assets   3,318 5,260 4,919
Common Stock Issued In Exchange For Trust Preferred Securities Value   0 0 5,628
Trust Preferred Securities Exchanged Liquidation Value   0 0 5,303
Transfer Of Loans Held For Sale To Portfolio Loans 1   10,234 1,443 40,086
Fair Value Of Assets Acquired $ 540,339      
Property Plant And Equipment Transferred To Other Assets   1,185 1,221 0
Deposits [Member]        
Non-cash investing and financing activities:        
Liabilities Assumed1 (523,517) 0 0 (523,517)
Loans [Member]        
Non-cash investing and financing activities:        
Fair Value Of Assets Acquired 311,410 0 0 311,410
Property Plant And Equipment [Member]        
Non-cash investing and financing activities:        
Fair Value Of Assets Acquired 5,450 0 0 5,450
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 0 5,820
Other Liabilities [Member]        
Non-cash investing and financing activities:        
Liabilities Assumed1 $ (3,379)      
Common Stock Outstanding [Member]        
Non-cash investing and financing activities:        
Common Stock Issued In Exchange For Trust Preferred Securities Value   $ 0 $ 0 $ 85