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Amortized Cost and Fair Value of Available-for-Sale and Held-to-Maturity Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Available-for-sale securities    
Due within one year, Amortized Cost $ 2,030  
Due within one year, Fair Value 2,041  
Due after one year but within five years, Amortized Cost 11,245  
Due after one year but within five years, Fair Value 11,522  
Due after five years but within ten years, Amortized Cost 42,252  
Due after five years but within ten years, Fair Value 42,497  
Due after ten years, Amortized Cost 159,404  
Due after ten years, Fair Value 149,205  
Amortized Cost 499,298 541,642
Fair Value 483,864 519,820
Held-to-maturity securities    
Due within one year, Amortized Cost     
Due after one year but within five years, Amortized Cost 8,161  
Due after five years but within ten years, Amortized Cost     
Due after ten years, Amortized Cost     
Amortized Cost 8,161 568
Held-to-maturity securities    
Due within one year, Fair Value     
Due after one year but within five years, Fair Value 8,148  
Due after five years but within ten years, Fair Value     
Due after ten years, Fair Value     
Fair Value 8,148 579
Debt Securities
    
Available-for-sale securities    
Amortized Cost 214,931  
Fair Value 205,265  
Total Mortgage Backed Securities
    
Available-for-sale securities    
Amortized Cost 283,634 318,862
Fair Value 277,561 310,175
Equity Securities
    
Available-for-sale securities    
Amortized Cost 733 5,259
Fair Value $ 1,038 $ 5,247