Goodwill and Other Amortizing Intangible Assets - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Goodwill And Other Intangibles [Line Items]
Goodwill	$ 303,328,000	$ 303,328,000
Impairment charges on goodwill	0	0	$ 0
Servicing Asset	3,000,000	2,500,000
Total amortization	18,671,000	16,169,000
Intangible amortization	3,196,000	3,497,000	3,689,000
Servicing Asset at Amortized Cost, Amortization	$ 700,000	600,000
Customer deposit intangibles
Goodwill And Other Intangibles [Line Items]
Core deposits remaining amortization period	6 years 8 months 12 days
Core deposits weighted average amortization period	5 years 3 months 18 days
Total amortization	$ 16,750,000	14,407,000
Customer list intangible
Goodwill And Other Intangibles [Line Items]
Core deposits remaining amortization period	6 years 8 months 12 days
Core deposits weighted average amortization period	4 years 10 months 24 days
Total amortization	$ 1,921,000	1,762,000
Customer-Related Intangible Assets [Member]
Goodwill And Other Intangibles [Line Items]
Intangible amortization	$ 2,500,000	$ 2,900,000	$ 3,400,000