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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, 2016
Dec. 31, 2015
Available-for-sale securities    
Due within one year, Amortized Cost $ 16,747  
Due after one year but within five years, Amortized Cost 2,131  
Due after five years but within ten years, Amortized Cost 87,281  
Due after ten years, Amortized Cost 78,441  
Amortized Cost 218,233 $ 372,389
Held-to-maturity securities    
Due within one year, Amortized Cost 46,867  
Due after one year but within five years, Amortized Cost 25,315  
Due after five years but within ten years, Amortized Cost 0  
Due after ten years, Amortized Cost 0  
Held-to-maturity Securities, Amortized Cost 72,182 72,541
Available-for-sale securities    
Due within one year, Fair Value 16,753  
Due after one year but within five years, Fair Value 2,178  
Due after five years but within ten years, Fair Value 91,586  
Due after ten years, Fair Value 76,474  
Fair Value 220,856 366,173
Held-to-maturity securities    
Due within one year, Fair Value 46,909  
Due after one year but within five years, Fair Value 25,698  
Due after five years but within ten years, Fair Value 0  
Due after ten years, Fair Value 0  
Fair Value 72,607 72,490
Debt Securities    
Available-for-sale securities    
Amortized Cost 184,600  
Available-for-sale securities    
Fair Value 186,991  
Total Mortgage Backed Securities    
Available-for-sale securities    
Amortized Cost 33,578  
Available-for-sale securities    
Fair Value 33,792  
Equity Securities    
Available-for-sale securities    
Amortized Cost 55 66
Available-for-sale securities    
Fair Value $ 73 $ 72