Loans - Loans Purchased by Portfolio Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchases of loans receivable	$ 50,978	$ 75,159
Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchases of loans receivable	15,113	13,931
Commercial and Industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchases of loans receivable	9,203	45,306
Residential Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchases of loans receivable	$ 26,662	$ 15,922