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Fair Value Measurement - Quantitative Information about Recurring Level 3 Fair Value Measurements (Detail) - Mortgage servicing rights $ in Thousands	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgages servicing rights, fair value	$ 6,614	$ 6,626
Minimum | Discounted cash flow | Constant prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.06	0.06
Minimum | Discounted cash flow | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.10	0.10
Maximum | Discounted cash flow | Constant prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.11	0.11
Maximum | Discounted cash flow | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.14	0.14
Weighted Average | Discounted cash flow | Constant prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.065	0.070
Weighted Average | Discounted cash flow | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.12	0.12

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Value of input used to measure alternative investment.

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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