v3.26.3
Servicing - Summary of Mortgage Servicing Rights Capitalized and Amortized (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Servicing Asset at Amortized Cost [Line Items]          
Beginning Balance     $ 5,175    
Ending Balance, March 31, $ 5,034   5,034   $ 5,175
Valuation Allowance     (1,400)   (883)
Mortgage Servicing Rights [Member]          
Servicing Asset at Amortized Cost [Line Items]          
Beginning Balance 6,364 $ 5,897 6,058 $ 5,753 5,753
Capitalized Additions 298 313 1,059 828  
Amortization (199) (214) (654) (585)  
Ending Balance, March 31, 6,463 5,996 6,463 5,996 $ 6,058
Valuation Allowance (1,429) (459) (1,429) (459)  
Servicing Rights net, March 31, $ 5,034 $ 5,537 $ 5,034 $ 5,537