Investments - Amortized Cost and Fair Value of Securities Held-to-Maturity (Detail) - USD ($) $ in Thousands |
Jun. 30, 2026 |
Dec. 31, 2025 |
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| Schedule of Held-to-Maturity Securities [Line Items] | ||
| Held-to-Maturity, Amortized Cost | $ 5,168 | $ 5,248 |
| Held-to-Maturity, Gross Unrecognized Gains | 81 | 161 |
| Held-to-Maturity, Gross Unrecognized Losses | (12) | |
| Held-to-maturity securities | 5,237 | 5,409 |
| Government-Sponsored Residential Mortgage-Backed Securities [Member] | ||
| Schedule of Held-to-Maturity Securities [Line Items] | ||
| Held-to-Maturity, Amortized Cost | 3,889 | 3,967 |
| Held-to-Maturity, Gross Unrecognized Gains | 52 | 131 |
| Held-to-Maturity, Gross Unrecognized Losses | (10) | |
| Held-to-maturity securities | 3,931 | 4,098 |
| State and Political Subdivisions [Member] | ||
| Schedule of Held-to-Maturity Securities [Line Items] | ||
| Held-to-Maturity, Amortized Cost | 1,279 | 1,281 |
| Held-to-Maturity, Gross Unrecognized Gains | 29 | 30 |
| Held-to-Maturity, Gross Unrecognized Losses | (2) | |
| Held-to-maturity securities | $ 1,306 | $ 1,311 |
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- Definition Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity). Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity). Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
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- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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