Investment Securities - Additional Information (Detail)	3 Months Ended
Mar. 31, 2023 USD ($) Security Securities	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($) Security Securities
Debt Securities, Available-for-Sale [Line Items]
Allowance for credit losses on available for sale debt securities	$ 0
Number of debt securities with unrealized losses \| Securities	168		175
Held to maturity debt securities \| Security	11		10
Tax benefit (provision)	$ 498,000	$ (3,000)
Pledged debt securities with a carrying value	46,288,000		$ 47,418,000
Investment in subordinated notes	86,804,000		78,813,000
Loss incurred on sale of investment	(2,370,000)	$ 13,000
Subordinated notes [Member] \| Corporate Debentures [Member]
Debt Securities, Available-for-Sale [Line Items]
Investment in subordinated notes			$ 3,000,000
Loss incurred on sale of investment	$ 2,445,000

Income Tax Expense Benefit Related to Realized Gains And Losses

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-Publisher FASB
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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).

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Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of unrealized and realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Disclosure regarding factors used to determine that the impairment of securities categorized as held-to-maturity where cost exceeds fair value is not an other than temporary impairment (OTTI). This item contains disclosure of the number of investment positions in the held-to-maturity investments determined to be temporarily impaired.

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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.

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