FAIR VALUE - Schedule of Additional Qualitative Information (Detail) - Fair Value, Measurements, Nonrecurring $ in Thousands	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Impaired loans | Appraisal of Collateral
Fair Value Inputs and Valuation Techniques [Line Items]
Fair Value Estimate	$ 2,196	$ 3,051
Impaired loans | Minimum | Appraisal of Collateral
Fair Value Inputs and Valuation Techniques [Line Items]
Asset, measurement input (percent)		0.06
Impaired loans | Maximum | Appraisal of Collateral
Fair Value Inputs and Valuation Techniques [Line Items]
Asset, measurement input (percent)		0.20
Mortgage Servicing Rights | Discounted Cash Flow
Fair Value Inputs and Valuation Techniques [Line Items]
Fair Value Estimate	$ 3,119
Measurement Input, Discount Rate | Impaired loans | Minimum
Fair Value Inputs and Valuation Techniques [Line Items]
Asset, measurement input (percent)	0.06
Measurement Input, Discount Rate | Impaired loans | Minimum | Appraisal of Collateral
Fair Value Inputs and Valuation Techniques [Line Items]
Asset, measurement input (percent)	0	0.05
Measurement Input, Discount Rate | Impaired loans | Maximum
Fair Value Inputs and Valuation Techniques [Line Items]
Asset, measurement input (percent)	0.33
Measurement Input, Discount Rate | Impaired loans | Maximum | Appraisal of Collateral
Fair Value Inputs and Valuation Techniques [Line Items]
Asset, measurement input (percent)	0.20	0.75
Measurement Input, Discount Rate | Mortgage Servicing Rights | Discounted Cash Flow
Fair Value Inputs and Valuation Techniques [Line Items]
Asset, measurement input (percent)	0.0954
Measurement Input, Constant Prepayment Rate | Mortgage Servicing Rights
Fair Value Inputs and Valuation Techniques [Line Items]
Asset, measurement input (percent)	0.1163