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FAIR VALUE DISCLOSURES - Summary of Financial Assets and Liabilities Measure at Fair Value on a Recurring Basis (Detail) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Assets  
Derivatives$ 24,733$ 14,974
Fair Value, Measurements, Recurring
  
Assets  
Derivatives0 
Available-for-sale investment securities1,120,179 
Total1,120,179 
Liabilities  
Derivatives3,760 
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 1
  
Assets  
Derivatives0 
Available-for-sale investment securities133 
Total133 
Liabilities  
Derivatives0 
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 2
  
Assets  
Derivatives26,086 
Available-for-sale investment securities1,120,046 
Total1,146,132 
Liabilities  
Derivatives28,493 
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 3
  
Assets  
Derivatives(1,353) 
Available-for-sale investment securities0 
Total(1,353) 
Liabilities  
Derivatives0 
Fair Value, Measurements, Recurring | Netting Adjustments
  
Assets  
Derivatives(24,733)[1] 
Available-for-sale investment securities0[1] 
Total(24,733)[1] 
Liabilities  
Derivatives$ (24,733)[1] 
[1]Amounts represent the impact of legally enforceable master netting arrangements that allow First Financial to settle positive and negative positions and also cash collateral held with the same counterparties.