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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, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Assets      
Derivatives $ 24,135 $ 24,566  
Available-for-sale investment securities 236,700 162,600 0
Fair Value, Measurements, Recurring
     
Assets      
Derivatives 0 0  
Available-for-sale investment securities 1,032,096 1,441,846  
Total 1,032,096 1,441,846  
Liabilities      
Derivatives 2,517 3,557  
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 1
     
Assets      
Derivatives 0 0  
Available-for-sale investment securities 144 141  
Total 144 141  
Liabilities      
Derivatives 0 0  
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 2
     
Assets      
Derivatives 24,135 24,566  
Available-for-sale investment securities 1,031,952 1,441,705  
Total 1,056,087 1,466,271  
Liabilities      
Derivatives 26,652 28,123  
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 3
     
Assets      
Derivatives 0 0  
Available-for-sale investment securities 0 0  
Total 0 0  
Liabilities      
Derivatives 0 0  
Fair Value, Measurements, Recurring | Netting Adjustments
     
Assets      
Derivatives (24,135) [1] (24,566) [1]  
Available-for-sale investment securities 0 [1] 0 [1]  
Total (24,135) [1] (24,566) [1]  
Liabilities      
Derivatives $ (24,135) [1] $ (24,566) [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.