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RISK MANAGEMENT AND DERIVATIVE INSTRUMENTS - Amount and Market Value of Mortgage Banking Derivatives (Detail) - USD ($)
Jun. 30, 2015
Dec. 31, 2014
Interest rate swap    
Derivatives, Fair Value [Line Items]    
Derivatives asset, fair values $ 166,000  
Other Assets    
Derivatives, Fair Value [Line Items]    
Notional Amount Assets 989,175,000 $ 205,658,000
Derivatives asset, fair values 11,800,000 6,379,000
Other Assets | Interest rate lock commitments    
Derivatives, Fair Value [Line Items]    
Notional Amount Assets 377,175,000 179,923,000
Derivatives asset, fair values 9,497,000 5,750,000
Other Assets | Mandatory forward commitments    
Derivatives, Fair Value [Line Items]    
Notional Amount Assets 562,000,000 25,735,000
Derivatives asset, fair values 1,872,000 629,000
Other Assets | Interest rate swap    
Derivatives, Fair Value [Line Items]    
Notional Amount Assets 50,000,000 0
Derivatives asset, fair values 431,000 0
Accrued Expenses and Other Liabilities    
Derivatives, Fair Value [Line Items]    
Notional Amount Liability 46,537,000 424,904,000
Derivatives liability, fair values 557,000 3,235,000
Accrued Expenses and Other Liabilities | Interest rate lock commitments    
Derivatives, Fair Value [Line Items]    
Notional Amount Liability 21,537,000 10,075,000
Derivatives liability, fair values 292,000 197,000
Accrued Expenses and Other Liabilities | Mandatory forward commitments    
Derivatives, Fair Value [Line Items]    
Notional Amount Liability 0 364,829,000
Derivatives liability, fair values 0 2,803,000
Accrued Expenses and Other Liabilities | Interest rate swap    
Derivatives, Fair Value [Line Items]    
Notional Amount Liability 25,000,000 50,000,000
Derivatives liability, fair values $ 265,000 $ 235,000