Premises and Equipment, Net and Other Assets - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Noncash construction in progress for retainage payable	$ 1,100,000	$ 1,000,000.0
Cash surrender value of life insurance policies	$ 82,700,000	81,400,000
Percentage of equity investment	50.00%
Low income housing tax credit investments	$ 24,700,000	20,100,000
Tax credits and other tax benefits recognized from LIHTC investments	6,400,000	6,500,000	$ 5,600,000
Equity securities	15,500,000	10,600,000
Other assets in equity interest	21,400,000	16,400,000
Amortization expense resulting from LIHTC investments	5,100,000	5,500,000	4,600,000
Unfunded commitment on investments	$ 22,300,000
Percentage of qualified investment	39.00%
Period of qualified investments taken	7 years
New market tax credit investments	$ 11,300,000	15,200,000
Tax credits and other tax benefits recognized from NMTC investments	4,700,000	4,000,000.0	4,000,000.0
Amortization expense resulting from NMTC investments	3,900,000	$ 3,300,000	$ 3,300,000
Unfunded commitment on NMTC investments	$ 0