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Fair Value Measurements and Disclosures - Summary of Carrying Amounts and Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Financial Assets: (Carrying Amount)    
Cash and cash equivalents $ 72,892 $ 117,348
Securities available-for-sale at fair value 209,928 247,171
Securities held-to-maturity 155 161
Loans receivable, net 1,773,346 1,795,218
Restricted investments in bank stock 2,341 2,075
Accrued interest receivable 7,566 7,975
Equity method investments 11,632 11,160
Mortgage servicing rights 707 1,060
Financial Liabilities (Carrying Amount)    
Deposits 1,928,585 2,032,625
Borrowings 0 0
Accrued interest payable 5,552 15,401
Financial Assets: (Fair Value)    
Securities available-for-sale at fair value 209,928 247,171
Securities held-to-maturity 156 162
Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member]    
Financial Assets: (Fair Value)    
Cash and cash equivalents 72,892 117,348
Securities available-for-sale at fair value 209,928 247,171
Securities held-to-maturity 158 162
Loans receivable, net 1,799,516 1,798,302
Restricted investments in bank stock 2,341 2,075
Accrued interest receivable 7,566 7,975
Equity method investments 11,632 11,160
Mortgage servicing rights 707 1,060
Financial Liabilities (Fair Value)    
Deposits 1,863,539 1,934,884
Borrowings 0  
Accrued interest payable 5,552 15,401
Fair Value, Inputs, Level 1 [Member]    
Financial Assets: (Fair Value)    
Cash and cash equivalents 72,892 117,348
Securities available-for-sale at fair value 2,929 4,389
Fair Value, Inputs, Level 2 [Member]    
Financial Assets: (Fair Value)    
Securities available-for-sale at fair value 206,999 242,782
Securities held-to-maturity 158 162
Restricted investments in bank stock 2,341 2,075
Accrued interest receivable 7,566 7,975
Equity method investments 7,520 6,850
Mortgage servicing rights 707 1,060
Financial Liabilities (Fair Value)    
Deposits 1,863,539 1,934,884
Borrowings 0  
Accrued interest payable 5,552 15,401
Fair Value, Inputs, Level 3 [Member]    
Financial Assets: (Fair Value)    
Loans receivable, net 1,799,516 1,798,302
Equity method investments $ 4,112 $ 4,310