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Fair Values of Financial Instruments - Schedule of Estimated Fair Values of Recognized Financial Instruments (Detail) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Financial assets    
Securities held-to-maturity $ 213,051 $ 211,954
Loans held for sale   52
Carrying Value [Member]    
Financial assets    
Securities held-to-maturity 243,334 247,401
Loans held for sale   52
Net loans 641,466 620,333
Financial liabilities    
Deposits 1,007,507 1,023,417
Other borrowings 2,394 2,461
Carrying Value [Member] | Mortgage Servicing Rights [Member]    
Financial assets    
Mortgage servicing rights 606 621
Fair Value [Member]    
Financial assets    
Securities held-to-maturity 213,051 211,954
Loans held for sale   55
Net loans 622,852 600,720
Financial liabilities    
Deposits 1,008,284 1,019,813
Other borrowings 2,270 2,321
Fair Value [Member] | Mortgage Servicing Rights [Member]    
Financial assets    
Mortgage servicing rights 606 621
Fair Value [Member] | Level I [Member]    
Financial assets    
Securities held-to-maturity 11,836 11,617
Loans held for sale   55
Financial liabilities    
Deposits 879,886 905,335
Fair Value [Member] | Level II [Member]    
Financial assets    
Securities held-to-maturity 201,215 200,337
Fair Value [Member] | Level III [Member]    
Financial assets    
Net loans 622,852 600,720
Financial liabilities    
Deposits 128,398 114,478
Other borrowings 2,270 2,321
Fair Value [Member] | Level III [Member] | Mortgage Servicing Rights [Member]    
Financial assets    
Mortgage servicing rights $ 606 $ 621