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Investment Securities - Schedule of Income Earned on Securities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Investment Income [Line Items]
Income earned on securities, taxable	$ 138,575	$ 91,933	$ 30,054
Income earned on securities, tax-exempt	31,618	28,356	19,642
Total	170,193	120,289	49,696
Debt Securities
Investment Income [Line Items]
Income earned on securities, taxable	108,650	71,352	30,054
Income earned on securities, tax-exempt	19,104	19,168	19,642
Held-to-maturity
Investment Income [Line Items]
Income earned on securities, taxable	29,925	20,581	0
Income earned on securities, tax-exempt	$ 12,514	$ 9,188	$ 0

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Amount of operating interest income, including, but not limited to, amortization and accretion of premiums and discounts on securities.

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