Derivative Financial Instruments - Narrative (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2025	Dec. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items]
Cash collateral pledged	$ 15,860	$ 80
Current net credit exposure	73,000
Non-performance risk in fair value measurement	4,300	$ 7,600
Cash and Due from Banks
Derivative Instruments, Gain (Loss) [Line Items]
Cash collateral pledged	16,400
CME Swaps Markets
Derivative Instruments, Gain (Loss) [Line Items]
Initial margin posted at clearing house	2,200
Valuation, Cost Approach
Derivative Instruments, Gain (Loss) [Line Items]
Cash collateral pledged	121,600
Valuation, Market Approach
Derivative Instruments, Gain (Loss) [Line Items]
Current net credit exposure	$ 105,300
Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Maximum time for forecasted transactions	2 years 4 months 24 days
Estimate of amount to be reclassified from AOCL	$ 300