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Amortized Cost and Aggregate Fair Value of Available-for-Sale and Held-to-Maturity Securities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Available-for-sale securities    
Due within one year, Amortized Cost $ 6,154  
Due after one year but within five years, Amortized Cost 61,263  
Due after five years but within ten years, Amortized Cost 66,872  
Due after ten years, Amortized Cost 146,616  
Amortized Cost 384,029 $ 332,942
Held-to-maturity securities    
Due within one year, Amortized Cost 190  
Due after one year but within five years, Amortized Cost 72,462  
Due after five years but within ten years, Amortized Cost 0  
Due after ten years, Amortized Cost 0  
Amortized Cost 72,652 57,948
Available-for-sale securities    
Due within one year, Fair Value 6,148  
Due after one year but within five years, Fair Value 61,253  
Due after five years but within ten years, Fair Value 68,976  
Due after ten years, Fair Value 137,802  
Fair Value 376,191 326,117
Held-to-maturity securities    
Due within one year, Fair Value 194  
Due after one year but within five years, Fair Value 72,685  
Due after five years but within ten years, Fair Value 0  
Due after ten years, Fair Value 0  
Fair Value 72,879 57,889
Debt Securities    
Available-for-sale securities    
Amortized Cost 280,905  
Available-for-sale securities    
Fair Value 274,179  
Total Mortgage Backed Securities    
Available-for-sale securities    
Amortized Cost 97,902  
Available-for-sale securities    
Fair Value 96,793  
Equity Securities    
Available-for-sale securities    
Amortized Cost 222 226
Available-for-sale securities    
Fair Value 219 $ 239
Certificates of deposit    
Available-for-sale securities    
Amortized Cost 5,000  
Available-for-sale securities    
Fair Value $ 5,000