Investments - Amortized Cost and Fair Value of Securities Held-to-Maturity (Detail) - USD ($) $ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
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| Schedule of Held-to-Maturity Securities [Line Items] | ||
| Held-to-Maturity, Amortized Cost | $ 5,248 | $ 5,217 |
| Held-to-Maturity, Gross Unrecognized Gains | 161 | 29 |
| Held-to-Maturity, Gross Unrecognized Losses | (32) | |
| Held-to-maturity securities | 5,409 | 5,214 |
| Government-Sponsored Residential Mortgage-Backed Securities [Member] | ||
| Schedule of Held-to-Maturity Securities [Line Items] | ||
| Held-to-Maturity, Amortized Cost | 3,967 | 3,932 |
| Held-to-Maturity, Gross Unrecognized Gains | 131 | 3 |
| Held-to-Maturity, Gross Unrecognized Losses | (26) | |
| Held-to-maturity securities | 4,098 | 3,909 |
| State and Political Subdivisions [Member] | ||
| Schedule of Held-to-Maturity Securities [Line Items] | ||
| Held-to-Maturity, Amortized Cost | 1,281 | 1,285 |
| Held-to-Maturity, Gross Unrecognized Gains | 30 | 26 |
| Held-to-Maturity, Gross Unrecognized Losses | (6) | |
| Held-to-maturity securities | $ 1,311 | $ 1,305 |
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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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