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FAIR VALUE DISCLOSURES - Summary of Financial Assets and Liabilities Measure at Fair Value on a Recurring Basis (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Assets    
Derivatives $ 10,126 $ 13,477
Investment securities available-for-sale 929,594 913,601
Liabilities    
Derivatives 10,750 14,431
Fair Value, Measurements, Recurring
   
Assets    
Derivatives 10,126 13,477
Investment securities available-for-sale 929,594 913,601
Total 939,720 927,078
Liabilities    
Derivatives 10,578 14,431
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 1
   
Assets    
Derivatives 0 0
Investment securities available-for-sale 8,258 7,976
Total 8,258 7,976
Liabilities    
Derivatives 0 0
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 2
   
Assets    
Derivatives 10,126 13,477
Investment securities available-for-sale 921,336 905,625
Total 931,462 919,102
Liabilities    
Derivatives 10,578 14,431
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 3
   
Assets    
Derivatives 0 0
Investment securities available-for-sale 0 0
Total 0 0
Liabilities    
Derivatives $ 0 $ 0