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Investment Securities - Summary of Amortized Cost and Fair Values of Investment Securities (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] |  |
Available for sale, Amortized Cost | $ 113,485 | $ 108,037
Available for sale, Gross Unrealized Gains | 1,173 | 741
Available for sale, Gross Unrealized Losses | 769 | 207
Available for sale, Fair Value | 113,889 | 108,571
Held to maturity, Amortized Cost |  | 12,192
Investment Securities, Amortized Cost |  | 120,229
Investment Securities, Gross Unrealized Gains |  | 1,205
Investment Securities, Gross Unrealized Losses |  | 209
Investment Securities, Fair Value |  | 121,225
State and Municipal [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available for sale, Amortized Cost | 13,792 |
Available for sale, Gross Unrealized Gains | 240 |
Available for sale, Gross Unrealized Losses | 21 |
Available for sale, Fair Value | 14,011 |
Held to maturity, Amortized Cost |  | 12,192
Held to maturity, Gross Unrealized Gains |  | 464
Held to maturity, Gross Unrealized Losses |  | 2
Held to maturity, Fair Value |  | 12,654
Mortgage Backed Securities [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available for sale, Amortized Cost | 79,263 | 94,983
Available for sale, Gross Unrealized Gains | 836 | 654
Available for sale, Gross Unrealized Losses | 608 | 152
Available for sale, Fair Value | 79,491 | 95,485
U.S. Treasury and Agencies [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available for sale, Amortized Cost | 2,500 | 2,500
Available for sale, Gross Unrealized Losses | 34 | 51
Available for sale, Fair Value | 2,466 | 2,449
Corporate Bonds [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available for sale, Amortized Cost | 17,930 | 10,554
Available for sale, Gross Unrealized Gains | 97 | 87
Available for sale, Gross Unrealized Losses | 106 | 4
Available for sale, Fair Value | $ 17,921 | $ 10,637

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