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Securities - Gross Unrealized Losses, Aggregated by Investment Category and Length of Time (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ (57) $ (26)
Fair Value, Less Than Twelve Months 10,524 3,951
Gross Unrealized Losses, Twelve Months and Over (183) (4,085)
Fair Value, Twelve Months and Over 43,646 145,348
Gross Unrealized Losses, Total (240) (4,111)
Fair Value, Total 54,170 149,299
U.S. Treasury [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Twelve Months and Over (30) (254)
Fair Value, Twelve Months and Over 12,015 20,861
Gross Unrealized Losses, Total (30) (254)
Fair Value, Total 12,015 20,861
U.S. Government Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Twelve Months and Over (35) (1,910)
Fair Value, Twelve Months and Over 13,720 64,727
Gross Unrealized Losses, Total (35) (1,910)
Fair Value, Total 13,720 64,727
Mortgage-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (48) (4)
Fair Value, Less Than Twelve Months 8,099 697
Gross Unrealized Losses, Twelve Months and Over (117) (1,138)
Fair Value, Twelve Months and Over 16,811 30,347
Gross Unrealized Losses, Total (165) (1,142)
Fair Value, Total 24,910 31,044
State and Local Governments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (9) (22)
Fair Value, Less Than Twelve Months 2,425 3,254
Gross Unrealized Losses, Twelve Months and Over (1) (783)
Fair Value, Twelve Months and Over 1,100 29,413
Gross Unrealized Losses, Total (10) (805)
Fair Value, Total $ 3,525 $ 32,667