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Fair Values of Financial Instruments - Schedule of Estimated Fair Values of Recognized Financial Instruments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Financial assets    
Securities held-to-maturity $ 174,528 $ 9,225
Loans held for sale 231 1,378
Mortgage Servicing Rights [Member]    
Financial assets    
Mortgage servicing rights 604 488
Carrying Value [Member]    
Financial assets    
Securities held-to-maturity 174,808 9,045
Loans held for sale 231 1,378
Net loans 541,536 600,885
Financial liabilities    
Deposits 1,002,747 891,562
Other borrowings 3,407 4,664
Carrying Value [Member] | Mortgage Servicing Rights [Member]    
Financial assets    
Mortgage servicing rights 604 488
Fair Value [Member]    
Financial assets    
Securities held-to-maturity 174,528 9,225
Loans held for sale 238 1,428
Net loans 548,317 598,583
Financial liabilities    
Deposits 1,002,377 892,357
Other borrowings 3,431 4,775
Fair Value [Member] | Mortgage Servicing Rights [Member]    
Financial assets    
Mortgage servicing rights 604 488
Fair Value [Member] | Level I [Member]    
Financial assets    
Securities held-to-maturity 12,693  
Loans held for sale 238 1,428
Financial liabilities    
Deposits 881,372 768,230
Fair Value [Member] | Level II [Member]    
Financial assets    
Securities held-to-maturity 161,835 9,225
Fair Value [Member] | Level III [Member]    
Financial assets    
Net loans 548,317 598,583
Financial liabilities    
Deposits 121,005 124,127
Other borrowings 3,431 4,775
Fair Value [Member] | Level III [Member] | Mortgage Servicing Rights [Member]    
Financial assets    
Mortgage servicing rights $ 604 $ 488