Loans and Allowance for Credit Losses - Modifications Subsequent Default (Detail) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2025 USD ($) Contract	Dec. 31, 2024 USD ($) Contract
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $	$ 388	$ 179
Financing Receivable, Modified, Subsequent Default, Number of contracts | Contract	2,000	2,000
Residential real estate [Member]
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $	$ 388	$ 179
Financing Receivable, Modified, Subsequent Default, Number of contracts | Contract	2,000	2,000
Residential real estate [Member] | Senior Lien
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $	$ 388	$ 179
Financing Receivable, Modified, Subsequent Default, Number of contracts | Contract	2,000	2,000