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Amortized Cost and Aggregate Fair Value of Available-for-Sale and Held-to-Maturity Securities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Available-for-sale securities    
Due within one year, Amortized Cost $ 56,044  
Due after one year but within five years, Amortized Cost 20,108  
Due after five years but within ten years, Amortized Cost 75,932  
Due after ten years, Amortized Cost 134,459  
Amortized Cost 386,197 $ 332,942
Held-to-maturity securities    
Due within one year, Amortized Cost 190  
Due after one year but within five years, Amortized Cost 72,406  
Due after five years but within ten years, Amortized Cost 0  
Due after ten years, Amortized Cost 0  
Amortized Cost 72,596 57,948
Available-for-sale securities    
Due within one year, Fair Value 55,956  
Due after one year but within five years, Fair Value 20,137  
Due after five years but within ten years, Fair Value 78,955  
Due after ten years, Fair Value 127,804  
Fair Value 382,212 326,117
Held-to-maturity securities    
Due within one year, Fair Value 191  
Due after one year but within five years, Fair Value 72,839  
Due after five years but within ten years, Fair Value 0  
Due after ten years, Fair Value 0  
Fair Value 73,030 57,889
Debt Securities    
Available-for-sale securities    
Amortized Cost 286,543  
Available-for-sale securities    
Fair Value 282,852  
Total Mortgage Backed Securities    
Available-for-sale securities    
Amortized Cost 94,432  
Available-for-sale securities    
Fair Value 94,125  
Equity Securities    
Available-for-sale securities    
Amortized Cost 222 226
Available-for-sale securities    
Fair Value 235 $ 239
Certificates of deposit    
Available-for-sale securities    
Amortized Cost 5,000  
Available-for-sale securities    
Fair Value $ 5,000