Fair Value Measurement - Summary of Quantitative Information about Recurring Level 3 Fair Value Measurements (Detail) $ in Thousands	Jun. 30, 2026 USD ($)	Dec. 31, 2025 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgages servicing rights, fair value	$ 6,502	$ 6,640
Mortgage servicing rights
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgages servicing rights, fair value	$ 6,502	$ 6,640
Minimum \| Mortgage servicing rights \| Discounted cash flow \| Constant prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.06	0.06
Minimum \| Mortgage servicing rights \| Discounted cash flow \| Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.10	0.10
Maximum \| Mortgage servicing rights \| Discounted cash flow \| Constant prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.13	0.12
Maximum \| Mortgage servicing rights \| Discounted cash flow \| Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.14	0.14
Weighted Average \| Mortgage servicing rights \| Discounted cash flow \| Constant prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.074	0.070
Weighted Average \| Mortgage servicing rights \| Discounted cash flow \| Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.12	0.12