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DERIVATIVES - Summary of Derivative Financial Instruments and Balances (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Derivatives, Fair Value [Line Items]    
Inerest-bearing deposit liability $ 916,011 $ 935,493
Estimate Fair Value Gain 14,848 24,135
Estimate Fair Value Loss (16,044) (26,423)
Fair Value Hedges
   
Derivatives, Fair Value [Line Items]    
Inerest-bearing deposit liability 916,011 935,493
Fair Value Hedges | Accrued interest and other liabilities
   
Derivatives, Fair Value [Line Items]    
Inerest-bearing deposit liability 563,200 509,100
Fair Value Hedges | Pay fixed interest rate swaps with counterparty | Accrued interest and other liabilities
   
Derivatives, Fair Value [Line Items]    
Inerest-bearing deposit liability 10,431 12,739
Estimate Fair Value Gain 0 0
Estimate Fair Value Loss (999) (1,445)
Fair Value Hedges | Matched interest rate swaps | Accrued interest and other liabilities
   
Derivatives, Fair Value [Line Items]    
Inerest-bearing deposit liability 452,790 461,377
Estimate Fair Value Gain 1,050 0
Estimate Fair Value Loss (13,995) (24,978)
Fair Value Hedges | Matched interest rate swaps | Accrued interest and other assets
   
Derivatives, Fair Value [Line Items]    
Inerest-bearing deposit liability 452,790 461,377
Estimate Fair Value Gain 13,798 24,135
Estimate Fair Value Loss $ (1,050) $ 0