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Investment Securities - Summary of Amortized Cost and Held-to-maturity, Gross Unrealized Gains and Losses, and Fair Value of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items] |  |
Amortized Cost | $ 96,130 | $ 101,453
Gross Unrealized Gains | 409 | 2,787
Gross Unrealized Losses | (3,337) | (457)
Fair Value | 93,202 | 103,783
Held-to-Maturity, Amortized Cost | 5,000 |
Fair value | 4,981 | 0
Small Business Administration Loan Pools [Member] |  |
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items] |  |
Amortized Cost | 1,020 | 1,099
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (17) | (15)
Fair Value | 1,003 | 1,084
Obligations of state and political subdivisions [Member] |  |
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items] |  |
Amortized Cost | 44,827 | 46,115
Gross Unrealized Gains | 397 | 2,405
Gross Unrealized Losses | (1,332) | (38)
Fair Value | 43,892 | 48,482
Mortgage-backed securities in government-sponsored entities [Member] |  |
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items] |  |
Amortized Cost | 50,283 | 54,239
Gross Unrealized Gains | 12 | 382
Gross Unrealized Losses | (1,988) | (404)
Fair Value | 48,307 | $ 54,217
Corporate Debentures [Member] |  |
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items] |  |
Held-to-Maturity, Amortized Cost | 5,000 |
Gross Unrecognized Gain | 0 |
Gross Unrecognized Losses | (19) |
Fair value | $ 4,981 |

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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