Investment Securities and Other Investments - Additional Information (Detail) - USD ($) |
3 Months Ended | ||||
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Jun. 30, 2026 |
Dec. 31, 2025 |
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| Schedule Of Investments [Line Items] | |||||
| Investment securities classified as held to maturity | $ 0 | $ 0 | |||
| Unrealized gain position | 13,000,000 | 42,400,000 | |||
| Federal home loan bank stock | 8,900,000 | 9,100,000 | |||
| Federal reserve bank stock | 7,400,000 | 9,400,000 | |||
| Correspondent bank stock | 500,000 | 500,000 | |||
| Other equity investments | 5,000,000 | 4,900,000 | |||
| Other investments | 17,991,000 | 20,781,000 | [1] | ||
| Loss on liquidation investment | (600,000) | ||||
| Equity Method Investments | 3,200,000 | 6,300,000 | |||
| Asset Pledged as Collateral without Right [Member] | FHLB [Member] | |||||
| Schedule Of Investments [Line Items] | |||||
| Securities pledged | 163,800,000 | 174,300,000 | |||
| Third Party Investment Grade [Member] | |||||
| Schedule Of Investments [Line Items] | |||||
| Securities pledged | $ 21,000,000 | $ 23,500,000 | |||
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- Definition Correspondent bank stock. No definition available.
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- Definition Debt securities available for sale unrealized gain position No definition available.
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- Definition Amount, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity), and investment in debt security measured at fair value with change in fair value recognized in net income (trading). Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Fair value portion of investments accounted under the equity method. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Federal Reserve Bank stock represents an equity interest in the Federal Reserve Bank. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of realized and unrealized gain (loss) on investment. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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 Amount of investments classified as other. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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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