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Investment Securities - Schedule of Income Earned on Available-for Sale Securities (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Investment Income [Line Items]
Income earned on securities, taxable	$ 33,229	$ 35,288
Income earned on securities, non-taxable	7,803	7,963
Total	41,032	43,251
Available-for-sale
Investment Income [Line Items]
Income earned on securities, taxable	25,762	27,798
Income earned on securities, non-taxable	4,695	4,826
Held-to-maturity
Investment Income [Line Items]
Income earned on securities, taxable	7,467	7,490
Income earned on securities, non-taxable	$ 3,108	$ 3,137

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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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