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Fair Values of Financial Instruments - Schedule of Estimated Fair Values of Recognized Financial Instruments (Detail) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Financial assets    
Securities held-to-maturity $ 232,675 $ 174,528
Loans held for sale 431 231
Carrying Value [Member]    
Financial assets    
Securities held-to-maturity 246,301 174,808
Loans held for sale 431 231
Net loans 560,070 541,536
Financial liabilities    
Deposits 994,939 1,002,747
Other borrowings 3,325 3,407
Carrying Value [Member] | Mortgage Servicing Rights [Member]    
Financial assets    
Mortgage servicing rights 618 604
Fair Value [Member]    
Financial assets    
Securities held-to-maturity 232,675 174,528
Loans held for sale 444 238
Net loans 564,887 548,317
Financial liabilities    
Deposits 994,370 1,002,377
Other borrowings 3,265 3,431
Fair Value [Member] | Mortgage Servicing Rights [Member]    
Financial assets    
Mortgage servicing rights 618 604
Fair Value [Member] | Level I [Member]    
Financial assets    
Securities held-to-maturity 12,116 12,693
Loans held for sale 444 238
Financial liabilities    
Deposits 876,951 881,372
Fair Value [Member] | Level II [Member]    
Financial assets    
Securities held-to-maturity 220,559 161,835
Fair Value [Member] | Level III [Member]    
Financial assets    
Net loans 564,887 548,317
Financial liabilities    
Deposits 117,419 121,005
Other borrowings 3,265 3,431
Fair Value [Member] | Level III [Member] | Mortgage Servicing Rights [Member]    
Financial assets    
Mortgage servicing rights $ 618 $ 604