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Loan Servicing - Summary of Activity In Mortgage Servicing Rights (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Transfers and Servicing [Abstract]        
Beginning Balance $ 280 $ 321 $ 305 $ 339
Additions 2 7 5 7
Payoffs (3)   (9) (7)
Change in fair value due to change in assumptions (12) (20) (34) (31)
Ending Balance $ 267 $ 308 $ 267 $ 308