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Securities - Gross Unrealized Losses, Aggregated by Investment Category and Length of Time (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ (891) $ (32)
Fair Value, Less Than Twelve Months 106,449 8,900
Gross Unrealized Losses, Twelve Months and Over (451) (1,914)
Fair Value, Twelve Months and Over 25,293 123,852
U.S. Treasury [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (142)  
Fair Value, Less Than Twelve Months 23,241  
Gross Unrealized Losses, Twelve Months and Over (167) (440)
Fair Value, Twelve Months and Over 10,195 25,393
U.S. Government Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (635) (1)
Fair Value, Less Than Twelve Months 68,957 5,458
Gross Unrealized Losses, Twelve Months and Over (200) (1,310)
Fair Value, Twelve Months and Over 9,793 82,803
Mortgage-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (60)  
Fair Value, Less Than Twelve Months 6,331  
Gross Unrealized Losses, Twelve Months and Over (56) (62)
Fair Value, Twelve Months and Over 3,580 7,900
State and Local Governments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (54) (31)
Fair Value, Less Than Twelve Months 7,920 3,442
Gross Unrealized Losses, Twelve Months and Over (28) (102)
Fair Value, Twelve Months and Over $ 1,725 $ 7,756