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v3.23.3

Investment Securities - Summary of Amortized Cost and Estimated Fair Value (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost | $ 104,309 | $ 94,997
Gross Unrealized Gains | 3 | 10
Gross Unrealized Losses | (16,248) | (11,605)
Fair value | 88,064 | 83,402
Mortgage-backed securities—U.S. government sponsored enterprises (GSEs) [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost | 47,917 | 41,515
Gross Unrealized Gains | 1 | 2
Gross Unrealized Losses | (7,875) | (6,602)
Fair value | 40,043 | 34,915
U.S. government agency securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost | 6,260 | 6,260
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1,356) | (1,175)
Fair value | 4,904 | 5,085
Obligations of state and political subdivisions [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost | 44,063 | 45,161
Gross Unrealized Gains | 0 | 8
Gross Unrealized Losses | (6,436) | (3,828)
Fair value | 37,627 | 41,341
Small business association (SBA) securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost | 2,817 |
Gross Unrealized Gains | 2 |
Gross Unrealized Losses | (1) |
Fair value | 2,818 |
Subordinated debentures [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost | 453 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Fair value | 453 |
SBIC securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost | 2,799 | 2,061
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (580) | 0
Fair value | $ 2,219 | $ 2,061

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