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Securities - Gross Unrealized Losses, Aggregated by Investment Category and Length of Time (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ (3,363) $ (3,803)
Fair Value, Less Than Twelve Months 161,242 167,230
Gross Unrealized Losses, Twelve Months and Over (50) (7)
Fair Value, Twelve Months and Over 4,775 526
U.S. Treasury [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (137) (146)
Fair Value, Less Than Twelve Months 15,721 15,745
U.S. Government Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (1,612) (1,795)
Fair Value, Less Than Twelve Months 82,640 77,471
Mortgage-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (842) (879)
Fair Value, Less Than Twelve Months 31,224 36,474
Gross Unrealized Losses, Twelve Months and Over (24)  
Fair Value, Twelve Months and Over 3,772  
State and Local Governments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (772) (983)
Fair Value, Less Than Twelve Months 31,657 37,540
Gross Unrealized Losses, Twelve Months and Over (26) (7)
Fair Value, Twelve Months and Over $ 1,003 $ 526