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Amortized Cost and Fair Value, Of Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Available-for-Sale    
Due within one year, Amortized cost $ 76,671  
Due after one year but within five years, Amortized cost 2,569  
Due after five years but within ten years, Amortized cost 83,879  
Due after ten years, Amortized cost 124,628  
Amortized Cost 372,389 $ 332,942
Due within one year, Fair value 76,456  
Due after one year but within five years, Fair value 2,604  
Due after five years but within ten years, Fair value 87,317  
Due after ten years, Fair value 116,168  
Fair Value 366,173 326,117
Held-to-Maturity    
Due One year or less, Amortized cost 25,248  
Due after one year but within five years, Amortized cost 47,293  
Due after five years but within ten years, Amortized cost 0  
Due after ten years, Amortized cost 0  
Held-to-maturity Securities, Amortized Cost 72,541 57,948
Held-to-maturity securities    
Due One year or less, Amortized cost 25,200  
Due after one year but within five years, Fair value 47,290  
Due after five years but within ten years, Fair value 0  
Due after ten years, Fair value 0  
Total fair value 72,490 57,889
US Treasury Securities    
Held-to-Maturity    
Due One year or less, Amortized cost 25,058  
Due after one year but within five years, Amortized cost 36,805  
Due after five years but within ten years, Amortized cost 0  
Due after ten years, Amortized cost 0  
Held-to-maturity Securities, Amortized Cost 61,863  
Held-to-maturity securities    
Due One year or less, Amortized cost 25,007  
Due after one year but within five years, Fair value 36,825  
Due after five years but within ten years, Fair value 0  
Due after ten years, Fair value 0  
Total fair value 61,832  
Municipal securities    
Available-for-Sale    
Due within one year, Amortized cost 1,100  
Due after one year but within five years, Amortized cost 2,567  
Due after five years but within ten years, Amortized cost 80,882  
Due after ten years, Amortized cost 40,331  
Amortized Cost 124,880 134,784
Due within one year, Fair value 1,123  
Due after one year but within five years, Fair value 2,602  
Due after five years but within ten years, Fair value 84,322  
Due after ten years, Fair value 40,631  
Fair Value 128,678 138,915
Held-to-Maturity    
Due One year or less, Amortized cost 190  
Due after five years but within ten years, Amortized cost 0  
Due after ten years, Amortized cost 0  
Held-to-maturity Securities, Amortized Cost 190 379
Held-to-maturity securities    
Due One year or less, Amortized cost 193  
Due after five years but within ten years, Fair value 0  
Due after ten years, Fair value 0  
Total fair value 193 386
Corporate securities    
Available-for-Sale    
Due within one year, Amortized cost 70,571  
Due after ten years, Amortized cost 55,882  
Due within one year, Fair value 70,333  
Due after ten years, Fair value 47,832  
Held-to-Maturity    
Due after one year but within five years, Amortized cost 10,488  
Due after five years but within ten years, Amortized cost 0  
Due after ten years, Amortized cost 0  
Held-to-maturity Securities, Amortized Cost 10,488  
Held-to-maturity securities    
Due after one year but within five years, Fair value 10,465  
Due after five years but within ten years, Fair value 0  
Due after ten years, Fair value 0  
Total fair value 10,465  
U.S. Agency securities    
Available-for-Sale    
Due after one year but within five years, Amortized cost 2  
Due after five years but within ten years, Amortized cost 2,997  
Due after ten years, Amortized cost 28,415  
Due after one year but within five years, Fair value 2  
Due after five years but within ten years, Fair value 2,995  
Due after ten years, Fair value 27,705  
Certificates of deposit    
Available-for-Sale    
Due within one year, Amortized cost 5,000  
Amortized Cost 5,000  
Due within one year, Fair value 5,000  
Fair Value 5,000  
Total Mortgage Backed Securities    
Available-for-Sale    
Amortized Cost 84,576  
Fair Value 83,556  
Debt Securities    
Available-for-Sale    
Amortized Cost 287,747  
Fair Value 282,545  
Debt Securities | Municipal securities    
Available-for-Sale    
Amortized Cost 124,880  
Fair Value 128,678  
Debt Securities | Corporate securities    
Available-for-Sale    
Amortized Cost 126,453  
Fair Value 118,165  
Debt Securities | U.S. Agency securities    
Available-for-Sale    
Amortized Cost 31,414  
Fair Value 30,702  
Debt Securities | Certificates of deposit    
Available-for-Sale    
Amortized Cost 5,000  
Fair Value 5,000  
Equity Securities    
Available-for-Sale    
Amortized Cost 66 226
Fair Value $ 72 $ 239