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Amortized Cost and Estimated Fair Value of Available-For-Sale and Held-To-Maturity Securities by Contractual Maturity (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Available-for-sale securities    
Due within one year, Amortized Cost $ 727  
Due within one year, Fair Value 739  
Due after one year but within five years, Amortized Cost 18,187  
Due after one year but within five years, Fair Value 18,635  
Due after five years but within ten years, Amortized Cost 30,835  
Due after five years but within ten years, Fair Value 31,180  
Due after ten years, Amortized Cost 168,702  
Due after ten years, Fair Value 157,023  
Amortized Cost 566,664 534,810
Fair Value 550,158 534,358
Held-to-maturity securities    
Due within one year, Amortized Cost     
Due after one year but within five years, Amortized Cost 627  
Due after five years but within ten years, Amortized Cost     
Due after ten years, Amortized Cost     
Amortized Cost 627 816
Held-to-maturity securities    
Due within one year, Fair Value     
Due after one year but within five years, Fair Value 639  
Due after five years but within ten years, Fair Value     
Due after ten years, Fair Value     
Fair Value 639 832
Debt Securities
    
Available-for-sale securities    
Amortized Cost 218,451  
Fair Value 207,577  
Total Mortgage Backed Securities
    
Available-for-sale securities    
Amortized Cost 342,898 324,538
Fair Value 337,150 326,964
Equity Securities
    
Available-for-sale securities    
Amortized Cost 5,315 3,446
Fair Value $ 5,431 $ 3,531