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Amortized Cost and Fair Value, Of Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Available-for-Sale    
Due within one year, Amortized cost $ 1,135  
Due after one year but within five years, Amortized cost 1,036  
Due after five years but within ten years, Amortized cost 88,449  
Due after ten years, Amortized cost 44,485  
Amortized Cost 166,450 $ 372,389
Due within one year, Fair value 1,141  
Due after one year but within five years, Fair value 1,060  
Due after five years but within ten years, Fair value 90,360  
Due after ten years, Fair value 42,054  
Fair Value 165,579 366,173
Held-to-Maturity    
Due One year or less, Amortized cost 21,851  
Due after one year but within five years, Amortized cost 25,282  
Due after five years but within ten years, Amortized cost 0  
Due after ten years, Amortized cost 0  
Held-to-maturity Securities, Amortized Cost 47,133 72,541
Held-to-maturity securities    
Due One year or less, Amortized cost 21,864  
Due after one year but within five years, Fair value 25,402  
Due after five years but within ten years, Fair value 0  
Due after ten years, Fair value 0  
Total fair value 47,266 72,490
US Treasury Securities    
Held-to-Maturity    
Due One year or less, Amortized cost 18,756  
Due after one year but within five years, Amortized cost 17,985  
Due after five years but within ten years, Amortized cost 0  
Due after ten years, Amortized cost 0  
Held-to-maturity Securities, Amortized Cost 36,741  
Held-to-maturity securities    
Due One year or less, Amortized cost 18,768  
Due after one year but within five years, Fair value 18,097  
Due after five years but within ten years, Fair value 0  
Due after ten years, Fair value 0  
Total fair value 36,865  
Municipal securities    
Available-for-Sale    
Due within one year, Amortized cost 1,135  
Due after one year but within five years, Amortized cost 1,035  
Due after five years but within ten years, Amortized cost 88,449  
Due after ten years, Amortized cost 21,040  
Amortized Cost 111,659 124,880
Due within one year, Fair value 1,141  
Due after one year but within five years, Fair value 1,059  
Due after five years but within ten years, Fair value 90,360  
Due after ten years, Fair value 20,771  
Fair Value 113,331 128,678
Held-to-Maturity    
Held-to-maturity Securities, Amortized Cost   190
Held-to-maturity securities    
Total fair value   193
Corporate securities    
Available-for-Sale    
Due after ten years, Amortized cost 22,104  
Due after ten years, Fair value 19,939  
Held-to-Maturity    
Due One year or less, Amortized cost 3,095  
Due after one year but within five years, Amortized cost 7,297  
Due after five years but within ten years, Amortized cost 0  
Due after ten years, Amortized cost 0  
Held-to-maturity Securities, Amortized Cost 10,392  
Held-to-maturity securities    
Due One year or less, Amortized cost 3,096  
Due after one year but within five years, Fair value 7,305  
Due after five years but within ten years, Fair value 0  
Due after ten years, Fair value 0  
Total fair value 10,401  
U.S. Agency securities    
Available-for-Sale    
Due after one year but within five years, Amortized cost 1  
Due after ten years, Amortized cost 1,341  
Due after one year but within five years, Fair value 1  
Due after ten years, Fair value 1,344  
Total Mortgage Backed Securities    
Available-for-Sale    
Amortized Cost 31,290  
Fair Value 30,891  
Debt Securities    
Available-for-Sale    
Amortized Cost 135,105  
Fair Value 134,615  
Debt Securities | Municipal securities    
Available-for-Sale    
Amortized Cost 111,659  
Fair Value 113,331  
Debt Securities | Corporate securities    
Available-for-Sale    
Amortized Cost 22,104  
Fair Value 19,939  
Debt Securities | U.S. Agency securities    
Available-for-Sale    
Amortized Cost 1,342  
Fair Value 1,345  
Equity Securities    
Available-for-Sale    
Amortized Cost 55 66
Fair Value $ 73 $ 72