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Summary of Financial Assets and Liabilities Measure at Fair Value on a Recurring Basis (Detail) (USD $)
In Thousands
Jun. 30, 2011
Dec. 31, 2010
Assets    
Derivatives $ 16,787 $ 14,974
Fair Value, Measurements, Recurring
   
Assets    
Derivatives 0  
Available-for-sale investment securities 1,134,114  
Total 1,134,114  
Liabilities    
Derivatives 2,871  
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 1
   
Assets    
Derivatives 0  
Available-for-sale investment securities 145  
Total 145  
Liabilities    
Derivatives 0  
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 2
   
Assets    
Derivatives 17,550  
Available-for-sale investment securities 1,133,969  
Total 1,151,519  
Liabilities    
Derivatives 19,658  
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 3
   
Assets    
Derivatives (763)  
Available-for-sale investment securities 0  
Total (763)  
Liabilities    
Derivatives 0  
Fair Value, Measurements, Recurring | Netting Adjustments
   
Assets    
Derivatives (16,787) [1]  
Available-for-sale investment securities 0 [1]  
Total (16,787) [1]  
Liabilities    
Derivatives $ (16,787) [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.