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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

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