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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
Jun. 30, 2014
Dec. 31, 2013
Available-for-sale securities    
Due within one year, Amortized Cost $ 1,689  
Due within one year, Fair Value 1,697  
Due after one year but within five years, Amortized Cost 9,397  
Due after one year but within five years, Fair Value 9,640  
Due after five years but within ten years, Amortized Cost 45,138  
Due after five years but within ten years, Fair Value 46,079  
Due after ten years, Amortized Cost 156,110  
Due after ten years, Fair Value 149,559  
Amortized Cost 407,602 541,642
Fair Value 398,425 519,820
Held-to-maturity securities    
Due within one year, Amortized Cost 190  
Due after one year but within five years, Amortized Cost 19,208  
Due after five years but within ten years, Amortized Cost     
Due after ten years, Amortized Cost     
Amortized Cost 19,398 568
Held-to-maturity securities    
Due within one year, Fair Value 192  
Due after one year but within five years, Fair Value 19,211  
Due after five years but within ten years, Fair Value     
Due after ten years, Fair Value     
Fair Value 19,403 579
Debt Securities
    
Available-for-sale securities    
Amortized Cost 212,334  
Fair Value 206,975  
Total Mortgage Backed Securities
    
Available-for-sale securities    
Amortized Cost 194,516 318,862
Fair Value 190,398 310,175
Equity Securities
    
Available-for-sale securities    
Amortized Cost 752 5,259
Fair Value $ 1,052 $ 5,247