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Fair Values of Financial Instruments - Schedule of Estimated Fair Values of Recognized Financial Instruments Carried at Amortized Cost (Detail) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Financial assets    
Securities held-to-maturity $ 194,730 $ 211,954
Loans held for sale   52
Mortgage Servicing Rights [Member]    
Financial assets    
Mortgage servicing rights 600 621
Carrying Value [Member]    
Financial assets    
Securities held-to-maturity 226,279 247,401
Loans held for sale   52
Net loans 694,797 620,333
Financial liabilities    
Deposits 1,027,427 1,023,417
Other borrowings 1,754 2,461
Carrying Value [Member] | Mortgage Servicing Rights [Member]    
Financial assets    
Mortgage servicing rights 600 621
Fair Value [Member]    
Financial assets    
Securities held-to-maturity 194,730 211,954
Loans held for sale   55
Net loans 663,510 600,720
Financial liabilities    
Deposits 1,028,973 1,019,813
Other borrowings 1,546 2,321
Fair Value [Member] | Mortgage Servicing Rights [Member]    
Financial assets    
Mortgage servicing rights 600 621
Fair Value [Member] | Level I [Member]    
Financial assets    
Securities held-to-maturity 9,507 11,617
Loans held for sale   55
Financial liabilities    
Deposits 835,847 905,335
Fair Value [Member] | Level II [Member]    
Financial assets    
Securities held-to-maturity 185,223 200,337
Fair Value [Member] | Level III [Member]    
Financial assets    
Net loans 663,510 600,720
Financial liabilities    
Deposits 193,126 114,478
Other borrowings 1,546 2,321
Fair Value [Member] | Level III [Member] | Mortgage Servicing Rights [Member]    
Financial assets    
Mortgage servicing rights $ 600 $ 621