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FAIR VALUE - Summary of Assets Measured at Fair Value on Nonrecurring Basis (Detail) - Fair Value, Measurements, Nonrecurring - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Assets, Fair Value Disclosure [Abstract]    
Impaired loans $ 1,392 $ 1,621
Mortgage servicing rights 322 2,732
Commercial Real Estate | Owner-occupied    
Assets, Fair Value Disclosure [Abstract]    
Impaired loans 751 846
Commercial Real Estate | Non-owner occupied residential    
Assets, Fair Value Disclosure [Abstract]    
Impaired loans 24 36
Commercial and industrial    
Assets, Fair Value Disclosure [Abstract]    
Impaired loans   12
Residential mortgage | First lien    
Assets, Fair Value Disclosure [Abstract]    
Impaired loans 545 638
Residential mortgage | Home equity - lines of credit    
Assets, Fair Value Disclosure [Abstract]    
Impaired loans 72 89
Level 1    
Assets, Fair Value Disclosure [Abstract]    
Impaired loans 0 0
Mortgage servicing rights 0 0
Level 1 | Commercial Real Estate | Owner-occupied    
Assets, Fair Value Disclosure [Abstract]    
Impaired loans 0 0
Level 1 | Commercial Real Estate | Non-owner occupied residential    
Assets, Fair Value Disclosure [Abstract]    
Impaired loans 0 0
Level 1 | Commercial and industrial    
Assets, Fair Value Disclosure [Abstract]    
Impaired loans   0
Level 1 | Residential mortgage | First lien    
Assets, Fair Value Disclosure [Abstract]    
Impaired loans 0 0
Level 1 | Residential mortgage | Home equity - lines of credit    
Assets, Fair Value Disclosure [Abstract]    
Impaired loans 0 0
Level 2    
Assets, Fair Value Disclosure [Abstract]    
Impaired loans 0 0
Mortgage servicing rights 0 0
Level 2 | Commercial Real Estate | Owner-occupied    
Assets, Fair Value Disclosure [Abstract]    
Impaired loans 0 0
Level 2 | Commercial Real Estate | Non-owner occupied residential    
Assets, Fair Value Disclosure [Abstract]    
Impaired loans 0 0
Level 2 | Commercial and industrial    
Assets, Fair Value Disclosure [Abstract]    
Impaired loans   0
Level 2 | Residential mortgage | First lien    
Assets, Fair Value Disclosure [Abstract]    
Impaired loans 0 0
Level 2 | Residential mortgage | Home equity - lines of credit    
Assets, Fair Value Disclosure [Abstract]    
Impaired loans 0 0
Level 3    
Assets, Fair Value Disclosure [Abstract]    
Impaired loans 1,392 1,621
Mortgage servicing rights 322 2,732
Level 3 | Commercial Real Estate | Owner-occupied    
Assets, Fair Value Disclosure [Abstract]    
Impaired loans 751 846
Level 3 | Commercial Real Estate | Non-owner occupied residential    
Assets, Fair Value Disclosure [Abstract]    
Impaired loans 24 36
Level 3 | Commercial and industrial    
Assets, Fair Value Disclosure [Abstract]    
Impaired loans   12
Level 3 | Residential mortgage | First lien    
Assets, Fair Value Disclosure [Abstract]    
Impaired loans 545 638
Level 3 | Residential mortgage | Home equity - lines of credit    
Assets, Fair Value Disclosure [Abstract]    
Impaired loans $ 72 $ 89