Segment Information - Information about Company's Segments (Parenthetical) (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Taxable-equivalent adjustment	$ 39,172,000	$ 14,731,000	$ 17,288,000
Noninterest income	2,356,603,000	2,166,994,000	2,088,444,000
Average total assets	$ 190,252,000,000	152,669,000,000	135,480,000,000
Commercial Real Estate [Member]
Segment Reporting Information [Line Items]
Noninterest income		8,800,000	6,000,000.0
Average total assets		$ 1,460,000,000	$ 1,380,000,000