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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
Sep. 30, 2023
Dec. 31, 2022
Financial assets    
Securities held-to-maturity $ 187,695 $ 211,954
Loans held for sale   52
Carrying Value [Member]    
Financial assets    
Securities held-to-maturity 230,505 247,401
Loans held for sale   52
Net loans 674,258 620,333
Financial liabilities    
Deposits 1,018,075 1,023,417
Other borrowings 1,808 2,461
Carrying Value [Member] | Mortgage Servicing Rights [Member]    
Financial assets    
Mortgage servicing rights 601 621
Fair Value [Member]    
Financial assets    
Securities held-to-maturity 187,695 211,954
Loans held for sale   55
Net loans 640,671 600,720
Financial liabilities    
Deposits 1,019,645 1,019,813
Other borrowings 1,687 2,321
Fair Value [Member] | Mortgage Servicing Rights [Member]    
Financial assets    
Mortgage servicing rights 601 621
Fair Value [Member] | Level I [Member]    
Financial assets    
Securities held-to-maturity 9,209 11,617
Loans held for sale   55
Financial liabilities    
Deposits 840,637 905,335
Fair Value [Member] | Level II [Member]    
Financial assets    
Securities held-to-maturity 178,486 200,337
Fair Value [Member] | Level III [Member]    
Financial assets    
Net loans 640,671 600,720
Financial liabilities    
Deposits 179,008 114,478
Other borrowings 1,687 2,321
Fair Value [Member] | Level III [Member] | Mortgage Servicing Rights [Member]    
Financial assets    
Mortgage servicing rights $ 601 $ 621