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Amortized Cost and Aggregate Fair Value of Held-to-Maturity Securities, Including Gross Unrealized Gains and Losses (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity Securities, Amortized Cost $ 72,541 $ 57,948
Held-to-maturity Securities, Unrealized Gains 78 29
Held-to-maturity Securities, Unrealized Losses (129) (88)
Held-to-maturity Securities, Fair Value 72,490 57,889
U.S. Agency securities    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity Securities, Amortized Cost 61,863 46,987
Held-to-maturity Securities, Unrealized Gains 75 22
Held-to-maturity Securities, Unrealized Losses (106) (54)
Held-to-maturity Securities, Fair Value 61,832 46,955
Corporate securities    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity Securities, Amortized Cost 10,488 10,582
Held-to-maturity Securities, Unrealized Losses (23) (34)
Held-to-maturity Securities, Fair Value 10,465 10,548
Municipal securities    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity Securities, Amortized Cost 190 379
Held-to-maturity Securities, Unrealized Gains 3 7
Held-to-maturity Securities, Fair Value $ 193 $ 386