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FAIR VALUE - Summary of Additional Qualitative Information (Details) - Fair Value, Measurements, Nonrecurring $ in Thousands	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Impaired loans | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset, measurement input (percent)		0.06
Impaired loans | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset, measurement input (percent)		0.33
Impaired loans | Measurement Input, Discount Rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset, measurement input (percent)	0.06
Impaired loans | Measurement Input, Discount Rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset, measurement input (percent)	0.19
Impaired loans | Appraisal of collateral
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Estimate	$ 2,041	$ 2,196
Impaired loans | Appraisal of collateral | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset, measurement input (percent)		0
Impaired loans | Appraisal of collateral | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset, measurement input (percent)		0.20
Impaired loans | Appraisal of collateral | Measurement Input, Discount Rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset, measurement input (percent)	0
Impaired loans | Appraisal of collateral | Measurement Input, Discount Rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset, measurement input (percent)	0.25
Mortgage servicing rights | Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Estimate	$ 2,661	$ 3,119
Mortgage servicing rights | Discounted cash flow | Measurement Input, Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset, measurement input (percent)	0.0957	0.0954
Mortgage servicing rights | Discounted cash flow | Measurement Input, Constant Prepayment Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset, measurement input (percent)	0.1696	0.1163

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Value of input used to measure servicing asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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