Low Income Housing Tax Credits and Other Tax Credit Investments - Summary of the Company's Investments in Low Income Housing Projects Accounted for Using the Proportional Amortization Method (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Investments in Affordable Housing Projects [Abstract]
Current recorded investment included in other assets	$ 105,797		$ 105,797		$ 81,035
Commitments to fund qualified affordable housing projects included in recorded investment noted above	63,809		63,809		$ 48,399
Tax credits and benefits recognized	2,333	$ 1,730	6,988	$ 4,717
Amortization expense included in income tax expense	$ 1,886	$ 1,496	$ 5,616	$ 4,255