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Amortized Cost and Aggregate Fair Value of Available-for-Sale and Held-to-Maturity Securities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Available-for-sale securities    
Due within one year, Amortized Cost $ 71,929  
Due after one year but within five years, Amortized Cost 2,623  
Due after five years but within ten years, Amortized Cost 88,169  
Due after ten years, Amortized Cost 116,843  
Amortized Cost 345,408 $ 372,389
Held-to-maturity securities    
Due within one year, Amortized Cost 25,232  
Due after one year but within five years, Amortized Cost 47,253  
Due after five years but within ten years, Amortized Cost 0  
Due after ten years, Amortized Cost 0  
Held-to-maturity Securities, Amortized Cost 72,485 72,541
Available-for-sale securities    
Due within one year, Fair Value 71,856  
Due after one year but within five years, Fair Value 2,663  
Due after five years but within ten years, Fair Value 92,622  
Due after ten years, Fair Value 105,612  
Fair Value 338,469 366,173
Held-to-maturity securities    
Due within one year, Fair Value 25,231  
Due after one year but within five years, Fair Value 47,712  
Due after five years but within ten years, Fair Value 0  
Due after ten years, Fair Value 0  
Fair Value 72,943 72,490
Debt Securities    
Available-for-sale securities    
Amortized Cost 279,564  
Available-for-sale securities    
Fair Value 272,753  
Total Mortgage Backed Securities    
Available-for-sale securities    
Amortized Cost 65,778  
Available-for-sale securities    
Fair Value 65,644  
Equity Securities    
Available-for-sale securities    
Amortized Cost 66 66
Available-for-sale securities    
Fair Value $ 72 $ 72