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Securities - Gross Unrealized Losses, Aggregated by Investment Category and Length of Time (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ (759) $ (625)
Fair Value, Less Than Twelve Months 44,917 66,400
Gross Unrealized Losses, Twelve Months and Over (5,660) (2,643)
Fair Value, Twelve Months and Over 129,282 106,840
U.S. Treasury [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (111) (36)
Fair Value, Less Than Twelve Months 6,860 6,924
Gross Unrealized Losses, Twelve Months and Over (259) (205)
Fair Value, Twelve Months and Over 13,910 14,054
U.S. Government Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (166) (314)
Fair Value, Less Than Twelve Months 7,424 27,328
Gross Unrealized Losses, Twelve Months and Over (2,820) (1,418)
Fair Value, Twelve Months and Over 68,344 53,139
Mortgage-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (132) (70)
Fair Value, Less Than Twelve Months 7,220 7,149
Gross Unrealized Losses, Twelve Months and Over (1,629) (720)
Fair Value, Twelve Months and Over 26,657 28,080
State and Local Governments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (350) (205)
Fair Value, Less Than Twelve Months 23,413 24,999
Gross Unrealized Losses, Twelve Months and Over (952) (300)
Fair Value, Twelve Months and Over $ 20,371 $ 11,567