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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
Sep. 30, 2014
Dec. 31, 2013
Available-for-sale securities    
Due within one year, Amortized Cost $ 3,229  
Due within one year, Fair Value 3,233  
Due after one year but within five years, Amortized Cost 6,994  
Due after one year but within five years, Fair Value 7,196  
Due after five years but within ten years, Amortized Cost 53,570  
Due after five years but within ten years, Fair Value 55,008  
Due after ten years, Amortized Cost 144,642  
Due after ten years, Fair Value 138,833  
Amortized Cost 360,473 541,642
Fair Value 351,693 519,820
Held-to-maturity securities    
Due within one year, Amortized Cost 190  
Due after one year but within five years, Amortized Cost 30,839  
Due after five years but within ten years, Amortized Cost     
Due after ten years, Amortized Cost     
Amortized Cost 31,029 568
Held-to-maturity securities    
Due within one year, Fair Value 191  
Due after one year but within five years, Fair Value 30,712  
Due after five years but within ten years, Fair Value     
Due after ten years, Fair Value     
Fair Value 30,903 579
Debt Securities
    
Available-for-sale securities    
Amortized Cost 208,435  
Fair Value 204,270  
Total Mortgage Backed Securities
    
Available-for-sale securities    
Amortized Cost 151,812 318,862
Fair Value 147,181 310,175
Equity Securities
    
Available-for-sale securities    
Amortized Cost 226 5,259
Fair Value $ 242 $ 5,247