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Investment Securities - Summary of Unrealized Losses (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Fair Value, Less Than 12 Months, Total | $ 35,590 | $ 28,234
Unrealized Losses, Less than 12 Months, Total | (753) | (84)
Fair Value, 12 Months or Greater, Total | 1,255 | 8,193
Unrealized Losses, 12 Months or Greater, Total | (16) | (125)
Fair Value, Total | 36,845 | 36,427
Unrealized Losses, Total | (769) | (209)
State and Municipal [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Held to maturity, Fair Value, Less Than 12 Months | 1,694 | 333
Held to maturity, Unrealized Losses, Less Than 12 Months | (21) | (2)
Fair Value, Total | 1,694 | 333
Unrealized Losses, Total | (21) | (2)
U.S. Treasury and Agencies [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available-for-sale Securities, Fair Value, Less Than 12 Months | 2,466 |
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months | (34) |
Available-for-sale Securities, Fair Value, 12 Months or Greater |  | 1,949
Available-for-sale Securities, Unrealized Losses, 12 months or Greater |  | (51)
Fair Value, Total | 2,466 | 1,949
Unrealized Losses, Total | (34) | (51)
Mortgage Backed Securities [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available-for-sale Securities, Fair Value, Less Than 12 Months | 25,035 | 27,901
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months | (593) | (82)
Available-for-sale Securities, Fair Value, 12 Months or Greater | 856 | 5,348
Available-for-sale Securities, Unrealized Losses, 12 months or Greater | (15) | (70)
Fair Value, Total | 25,891 | 33,249
Unrealized Losses, Total | (608) | (152)
Corporate Bonds [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available-for-sale Securities, Fair Value, Less Than 12 Months | 6,395 |
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months | (105) |
Available-for-sale Securities, Fair Value, 12 Months or Greater | 399 | 896
Available-for-sale Securities, Unrealized Losses, 12 months or Greater | (1) | (4)
Fair Value, Total | 6,794 | 896
Unrealized Losses, Total | $ (106) | $ (4)

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