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Investment Securities - Summary of Fair Value of Available For Sale Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Debt Securities Available For Sale Unrealized Loss Position Fair Value [Line Items] |  |
Less than 12 Months Fair Value | $ 13,230 | $ 52,026
Less than 12 Months Unrealized Losses | (654) | (5,235)
More than 12 Months Fair Value | 65,958 | 25,574
More than 12 Months Unrealized Losses | (15,594) | (6,370)
Fair Value | 79,188 | 77,600
Unrealized Losses | (16,248) | (11,605)
Mortgage-backed securities—U.S. government sponsored enterprises (GSEs) [Member] |  |
Debt Securities Available For Sale Unrealized Loss Position Fair Value [Line Items] |  |
Less than 12 Months Fair Value | 4,695 | 15,605
Less than 12 Months Unrealized Losses | (180) | (1,778)
More than 12 Months Fair Value | 30,434 | 19,137
More than 12 Months Unrealized Losses | (7,695) | (4,824)
Fair Value | 35,129 | 34,742
Unrealized Losses | (7,875) | (6,602)
U.S. government agency securities [Member] |  |
Debt Securities Available For Sale Unrealized Loss Position Fair Value [Line Items] |  |
Less than 12 Months Fair Value | 0 | 0
Less than 12 Months Unrealized Losses | 0 | 0
More than 12 Months Fair Value | 4,904 | 5,085
More than 12 Months Unrealized Losses | (1,356) | (1,175)
Fair Value | 4,904 | 5,085
Unrealized Losses | (1,356) | (1,175)
Obligations of state and political subdivisions [Member] |  |
Debt Securities Available For Sale Unrealized Loss Position Fair Value [Line Items] |  |
Less than 12 Months Fair Value | 7,757 | 36,421
Less than 12 Months Unrealized Losses | (473) | (3,457)
More than 12 Months Fair Value | 28,401 | 1,352
More than 12 Months Unrealized Losses | (5,963) | (371)
Fair Value | 36,158 | 37,773
Unrealized Losses | (6,436) | $ (3,828)
Small business association (SBA) securities [Member] |  |
Debt Securities Available For Sale Unrealized Loss Position Fair Value [Line Items] |  |
Less than 12 Months Fair Value | 778 |
Less than 12 Months Unrealized Losses | (1) |
More than 12 Months Fair Value | 0 |
More than 12 Months Unrealized Losses | 0 |
Fair Value | 778 |
Unrealized Losses | (1) |
SBIC securities [Member] |  |
Debt Securities Available For Sale Unrealized Loss Position Fair Value [Line Items] |  |
Less than 12 Months Fair Value | 0 |
Less than 12 Months Unrealized Losses | 0 |
More than 12 Months Fair Value | 2,219 |
More than 12 Months Unrealized Losses | (580) |
Fair Value | 2,219 |
Unrealized Losses | $ (580) |

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- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 320 -Name Accounting Standards Codification -Section 50 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480832/942-320-50-3A + Details
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