Goodwill and Other Amortizing Intangible Assets - Additional Information (Detail) - USD ($)		12 Months Ended
	Apr. 30, 2025	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Goodwill And Other Intangibles [Line Items]
Goodwill		$ 378,214,000	$ 363,715,000
Impairment charges on goodwill		0	0	$ 0
Servicing Asset		5,900,000	4,800,000
Total amortization		30,763,000	26,668,000
Intangible amortization		5,503,000	5,024,000	4,983,000
Servicing Asset at Amortized Cost, Amortization		$ 1,400,000	1,200,000	900,000
Goodwill, Acquired During Period	$ 14,499,000
Centric Bank
Goodwill And Other Intangibles [Line Items]
Goodwill, Acquired During Period	$ 14,499,000
Customer deposit intangibles
Goodwill And Other Intangibles [Line Items]
Core deposits remaining amortization period		4 years 8 months 12 days
Core deposits weighted average amortization period		4 years 4 months 24 days
Total amortization		$ 28,548,000	24,522,000
Customer list intangible
Goodwill And Other Intangibles [Line Items]
Core deposits remaining amortization period		3 years 8 months 12 days
Core deposits weighted average amortization period		2 years 4 months 24 days
Total amortization		$ 2,215,000	2,146,000
Customer-Related Intangible Assets [Member]
Goodwill And Other Intangibles [Line Items]
Intangible amortization		$ 4,100,000	$ 3,900,000	$ 4,100,000