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RISK MANAGEMENT AND DERIVATIVE INSTRUMENTS - Amount and Market Value of Mortgage Banking Derivatives (Detail) - USD ($)
$ in Thousands
Jun. 30, 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 $ 550,926 $ 783,342  
Derivatives asset, fair values 15,679 9,042  
Other Assets | Interest rate lock commitments      
Derivatives, Fair Value [Line Items]      
Notional Amount Assets 496,072 262,135  
Derivatives asset, fair values 15,313 7,343  
Other Assets | Mandatory forward commitments      
Derivatives, Fair Value [Line Items]      
Notional Amount Assets 32,192 468,740  
Derivatives asset, fair values 94 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 22,662 27,467  
Derivatives asset, fair values 272 238  
Accrued Expenses and Other Liabilities      
Derivatives, Fair Value [Line Items]      
Notional Amount Liability 1,031,387 309,529  
Derivatives liability, fair values 8,413 1,067  
Accrued Expenses and Other Liabilities | Interest rate lock commitments      
Derivatives, Fair Value [Line Items]      
Notional Amount Liability 15,998 16,790  
Derivatives liability, fair values 109 88  
Accrued Expenses and Other Liabilities | Mandatory forward commitments      
Derivatives, Fair Value [Line Items]      
Notional Amount Liability 967,727 215,272  
Derivatives liability, fair values 7,265 300  
Accrued Expenses and Other Liabilities | Interest rate swaps on deposits and other borrowings      
Derivatives, Fair Value [Line Items]      
Notional Amount Liability 25,000 50,000  
Derivatives liability, fair values 767 441  
Accrued Expenses and Other Liabilities | Interest rate swaps and caps on loans with correspondent bank      
Derivatives, Fair Value [Line Items]      
Notional Amount Liability 22,662 27,467  
Derivatives liability, fair values $ 272 $ 238