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DERIVATIVES - Summary of Derivative Financial Instruments and Balances (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Derivatives, Fair Value [Line Items]    
Inerest-bearing deposit liability $ 838,051 $ 913,324
Estimate Fair Value Gain 12,678 13,477
Estimate Fair Value Loss (13,463) (14,431)
Fair Value Hedges | Pay fixed interest rate swaps with counterparty | Accrued interest and other liabilities
   
Derivatives, Fair Value [Line Items]    
Inerest-bearing deposit liability 9,445 9,836
Estimate Fair Value Gain 0 0
Estimate Fair Value Loss (676) (865)
Fair Value Hedges | Matched interest rate swaps | Accrued interest and other liabilities
   
Derivatives, Fair Value [Line Items]    
Inerest-bearing deposit liability 414,303 451,744
Estimate Fair Value Gain 702 1,767
Estimate Fair Value Loss (12,085) (11,799)
Fair Value Hedges | Matched interest rate swaps | Accrued interest and other assets
   
Derivatives, Fair Value [Line Items]    
Inerest-bearing deposit liability 414,303 451,744
Estimate Fair Value Gain 11,976 11,710
Estimate Fair Value Loss $ (702) $ (1,767)