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Fair Values of Financial Instruments - Schedule of Estimated Fair Values of Recognized Financial Instruments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Financial assets    
Securities held-to-maturity $ 223,686 $ 174,528
Loans held for sale 428 231
Carrying Value [Member]    
Financial assets    
Securities held-to-maturity 248,261 174,808
Loans held for sale 428 231
Net loans 574,917 541,536
Financial liabilities    
Deposits 993,113 1,002,747
Other borrowings 2,594 3,407
Carrying Value [Member] | Mortgage Servicing Rights [Member]    
Financial assets    
Mortgage servicing rights 644 604
Fair Value [Member]    
Financial assets    
Securities held-to-maturity 223,686 174,528
Loans held for sale 433 238
Net loans 574,378 548,317
Financial liabilities    
Deposits 990,693 1,002,377
Other borrowings 2,513 3,431
Fair Value [Member] | Mortgage Servicing Rights [Member]    
Financial assets    
Mortgage servicing rights 644 604
Fair Value [Member] | Level I [Member]    
Financial assets    
Securities held-to-maturity 11,895 12,693
Loans held for sale 433 238
Financial liabilities    
Deposits 875,812 881,372
Fair Value [Member] | Level II [Member]    
Financial assets    
Securities held-to-maturity 211,791 161,835
Fair Value [Member] | Level III [Member]    
Financial assets    
Net loans 574,378 548,317
Financial liabilities    
Deposits 114,881 121,005
Other borrowings 2,513 3,431
Fair Value [Member] | Level III [Member] | Mortgage Servicing Rights [Member]    
Financial assets    
Mortgage servicing rights $ 644 $ 604