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RISK MANAGEMENT AND DERIVATIVE INSTRUMENTS - Amount and Market Value of Mortgage Banking Derivatives (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Interest rate swaps on deposits and other borrowings      
Derivatives, Fair Value [Line Items]      
Derivatives asset, fair values     $ 918
Other Assets      
Derivatives, Fair Value [Line Items]      
Notional Amount Assets $ 496,618 $ 783,342  
Derivatives asset, fair values 12,288 9,042  
Other Assets | Interest rate lock commitments      
Derivatives, Fair Value [Line Items]      
Notional Amount Assets 368,797 262,135  
Derivatives asset, fair values 11,700 7,343  
Other Assets | Mandatory forward commitments      
Derivatives, Fair Value [Line Items]      
Notional Amount Assets 104,582 468,740  
Derivatives asset, fair values 465 1,130  
Other Assets | Interest rate swaps on deposits and other borrowings      
Derivatives, Fair Value [Line Items]      
Notional Amount Assets 0 25,000  
Derivatives asset, fair values 0 331  
Other Assets | Interest rate swaps and cap on loans with customers      
Derivatives, Fair Value [Line Items]      
Notional Amount Assets 23,239 27,467  
Derivatives asset, fair values 123 238  
Accrued Expenses and Other Liabilities      
Derivatives, Fair Value [Line Items]      
Notional Amount Liability 889,463 309,529  
Derivatives liability, fair values 6,543 1,067  
Accrued Expenses and Other Liabilities | Interest rate lock commitments      
Derivatives, Fair Value [Line Items]      
Notional Amount Liability 13,587 16,790  
Derivatives liability, fair values 92 88  
Accrued Expenses and Other Liabilities | Mandatory forward commitments      
Derivatives, Fair Value [Line Items]      
Notional Amount Liability 777,637 215,272  
Derivatives liability, fair values 4,936 300  
Accrued Expenses and Other Liabilities | Interest rate swaps on deposits and other borrowings      
Derivatives, Fair Value [Line Items]      
Notional Amount Liability 75,000 50,000  
Derivatives liability, fair values 1,392 441  
Accrued Expenses and Other Liabilities | Interest rate swaps and caps on loans with correspondent bank      
Derivatives, Fair Value [Line Items]      
Notional Amount Liability 23,239 27,467  
Derivatives liability, fair values $ 123 $ 238