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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, 2020	Dec. 31, 2019
Summary of assets measured at fair value on a nonrecurring basis
Impaired loans	$ 1,621	$ 2,196
Mortgage servicing rights	2,745	3,119
Commercial Real Estate | Owner-occupied
Summary of assets measured at fair value on a nonrecurring basis
Impaired loans	846	938
Commercial Real Estate | Multi-family
Summary of assets measured at fair value on a nonrecurring basis
Impaired loans		96
Commercial Real Estate | Non-owner occupied residential
Summary of assets measured at fair value on a nonrecurring basis
Impaired loans	36	103
Commercial and industrial
Summary of assets measured at fair value on a nonrecurring basis
Impaired loans	12	11
Residential mortgage | First lien
Summary of assets measured at fair value on a nonrecurring basis
Impaired loans	638	641
Residential mortgage | Home equity - lines of credit
Summary of assets measured at fair value on a nonrecurring basis
Impaired loans	89	400
Installment and other loans
Summary of assets measured at fair value on a nonrecurring basis
Impaired loans		7
Level 1
Summary of assets measured at fair value on a nonrecurring basis
Impaired loans	0	0
Mortgage servicing rights	0	0
Level 1 | Commercial Real Estate | Owner-occupied
Summary of assets measured at fair value on a nonrecurring basis
Impaired loans	0	0
Level 1 | Commercial Real Estate | Multi-family
Summary of assets measured at fair value on a nonrecurring basis
Impaired loans		0
Level 1 | Commercial Real Estate | Non-owner occupied residential
Summary of assets measured at fair value on a nonrecurring basis
Impaired loans	0	0
Level 1 | Commercial and industrial
Summary of assets measured at fair value on a nonrecurring basis
Impaired loans	0	0
Level 1 | Residential mortgage | First lien
Summary of assets measured at fair value on a nonrecurring basis
Impaired loans	0	0
Level 1 | Residential mortgage | Home equity - lines of credit
Summary of assets measured at fair value on a nonrecurring basis
Impaired loans	0	0
Level 1 | Installment and other loans
Summary of assets measured at fair value on a nonrecurring basis
Impaired loans		0
Level 2
Summary of assets measured at fair value on a nonrecurring basis
Impaired loans	0	0
Mortgage servicing rights	0	0
Level 2 | Commercial Real Estate | Owner-occupied
Summary of assets measured at fair value on a nonrecurring basis
Impaired loans	0	0
Level 2 | Commercial Real Estate | Multi-family
Summary of assets measured at fair value on a nonrecurring basis
Impaired loans		0
Level 2 | Commercial Real Estate | Non-owner occupied residential
Summary of assets measured at fair value on a nonrecurring basis
Impaired loans	0	0
Level 2 | Commercial and industrial
Summary of assets measured at fair value on a nonrecurring basis
Impaired loans	0	0
Level 2 | Residential mortgage | First lien
Summary of assets measured at fair value on a nonrecurring basis
Impaired loans	0	0
Level 2 | Residential mortgage | Home equity - lines of credit
Summary of assets measured at fair value on a nonrecurring basis
Impaired loans	0	0
Level 2 | Installment and other loans
Summary of assets measured at fair value on a nonrecurring basis
Impaired loans		0
Level 3
Summary of assets measured at fair value on a nonrecurring basis
Impaired loans	1,621	2,196
Mortgage servicing rights	2,745	3,119
Level 3 | Commercial Real Estate | Owner-occupied
Summary of assets measured at fair value on a nonrecurring basis
Impaired loans	846	938
Level 3 | Commercial Real Estate | Multi-family
Summary of assets measured at fair value on a nonrecurring basis
Impaired loans		96
Level 3 | Commercial Real Estate | Non-owner occupied residential
Summary of assets measured at fair value on a nonrecurring basis
Impaired loans	36	103
Level 3 | Commercial and industrial
Summary of assets measured at fair value on a nonrecurring basis
Impaired loans	12	11
Level 3 | Residential mortgage | First lien
Summary of assets measured at fair value on a nonrecurring basis
Impaired loans	638	641
Level 3 | Residential mortgage | Home equity - lines of credit
Summary of assets measured at fair value on a nonrecurring basis
Impaired loans	$ 89	400
Level 3 | Installment and other loans
Summary of assets measured at fair value on a nonrecurring basis
Impaired loans		$ 7

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Aggregate amount of servicing assets that are subsequently measured at fair value and servicing assets that are subsequently measured using the amortization method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 45
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745

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