Investment Securities - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2024 USD ($) Security Securities	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($) Security Securities
Debt Securities, Available-for-Sale [Line Items]
Allowance for credit losses on available for sale debt securities	$ 0		$ 0
Number of debt securities with unrealized losses | Securities	190		164
Held to maturity debt securities | Security	12		12
Proceeds from sales	$ 0	$ 1,847,000
Accrued interest receivable on available for sale debt securities	726,000
Accrued interest receivable on held-to-maturity debt securities	187,000
Tax benefit (provision)		498,000
Pledged debt securities with a carrying value	62,455,000		$ 65,935,000
Investment in subordinated notes	$ 133,949,000		$ 115,490,000
Loss incurred on sale of investment		$ (2,370,000)