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RISK MANAGEMENT AND DERIVATIVE INSTRUMENTS - Amount and Market Value of Mortgage Banking Derivatives (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Interest rate swap    
Derivatives, Fair Value [Line Items]    
Derivatives asset, fair values $ (918)  
Other Assets    
Derivatives, Fair Value [Line Items]    
Notional Amount Assets 330,769 $ 205,658
Derivatives asset, fair values 9,748 6,379
Other Assets | Interest rate lock commitments    
Derivatives, Fair Value [Line Items]    
Notional Amount Assets 305,769 179,923
Derivatives asset, fair values 9,721 5,750
Other Assets | Mandatory forward commitments    
Derivatives, Fair Value [Line Items]    
Notional Amount Assets 0 25,735
Derivatives asset, fair values 0 629
Other Assets | Interest rate swap    
Derivatives, Fair Value [Line Items]    
Notional Amount Assets 25,000 0
Derivatives asset, fair values 27 0
Accrued Expenses and Other Liabilities    
Derivatives, Fair Value [Line Items]    
Notional Amount Liability 570,455 424,904
Derivatives liability, fair values 5,873 3,235
Accrued Expenses and Other Liabilities | Interest rate lock commitments    
Derivatives, Fair Value [Line Items]    
Notional Amount Liability 3,455 10,075
Derivatives liability, fair values 108 197
Accrued Expenses and Other Liabilities | Mandatory forward commitments    
Derivatives, Fair Value [Line Items]    
Notional Amount Liability 517,000 364,829
Derivatives liability, fair values 4,820 2,803
Accrued Expenses and Other Liabilities | Interest rate swap    
Derivatives, Fair Value [Line Items]    
Notional Amount Liability 50,000 50,000
Derivatives liability, fair values $ 945 $ 235