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Fair Values of Financial Instruments - Schedule of Estimated Fair Values of Recognized Financial Instruments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Financial assets    
Securities held-to-maturity $ 203,979 $ 211,954
Loans held for sale 184 52
Carrying Value [Member]    
Financial assets    
Securities held-to-maturity 238,222 247,401
Loans held for sale 184 52
Net loans 658,046 620,333
Financial liabilities    
Deposits 1,021,671 1,023,417
Other borrowings 1,862 2,461
Carrying Value [Member] | Mortgage Servicing Rights [Member]    
Financial assets    
Mortgage servicing rights 607 621
Fair Value [Member]    
Financial assets    
Securities held-to-maturity 203,979 211,954
Loans held for sale 187 55
Net loans 626,195 600,720
Financial liabilities    
Deposits 1,022,759 1,019,813
Other borrowings 1,750 2,321
Fair Value [Member] | Mortgage Servicing Rights [Member]    
Financial assets    
Mortgage servicing rights 607 621
Fair Value [Member] | Level I [Member]    
Financial assets    
Securities held-to-maturity 11,746 11,617
Loans held for sale 187 55
Financial liabilities    
Deposits 862,034 905,335
Fair Value [Member] | Level II [Member]    
Financial assets    
Securities held-to-maturity 192,233 200,337
Fair Value [Member] | Level III [Member]    
Financial assets    
Net loans 626,195 600,720
Financial liabilities    
Deposits 160,725 114,478
Other borrowings 1,750 2,321
Fair Value [Member] | Level III [Member] | Mortgage Servicing Rights [Member]    
Financial assets    
Mortgage servicing rights $ 607 $ 621