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DERIVATIVES - Summary of Derivative Financial Instruments and Balances (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Derivatives, Fair Value [Line Items]    
Interest-bearing deposit swap $ 913,324 $ 935,493
Estimate Fair Value Gain 13,477 24,135
Estimate Fair Value Loss (14,431) (26,423)
Fair Value Hedges | Accrued interest and other liabilities
   
Derivatives, Fair Value [Line Items]    
Interest-bearing deposit swap 561,600 509,100
Fair Value Hedges | Pay fixed interest rate swaps with counterparty | Accrued interest and other liabilities
   
Derivatives, Fair Value [Line Items]    
Interest-bearing deposit swap 9,836 12,739
Estimate Fair Value Gain 0 0
Estimate Fair Value Loss (865) (1,445)
Fair Value Hedges | Matched interest rate swaps | Accrued interest and other liabilities
   
Derivatives, Fair Value [Line Items]    
Interest-bearing deposit swap 451,744 461,377
Estimate Fair Value Gain 1,767 0
Estimate Fair Value Loss (11,799) (24,978)
Fair Value Hedges | Matched interest rate swaps | Accrued interest and other assets
   
Derivatives, Fair Value [Line Items]    
Interest-bearing deposit swap 451,744 461,377
Estimate Fair Value Gain 11,710 24,135
Estimate Fair Value Loss $ (1,767) $ 0