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FAIR VALUE - Summary of Additional Qualitative Information (Details) - Fair Value, Measurements, Nonrecurring $ in Thousands | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
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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) |  | 0.19
Impaired loans | Discount Rate | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Asset, measurement input (percent) | 0.06 |
Impaired loans | Discount Rate | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Asset, measurement input (percent) | 0.18 |
Impaired loans | Appraisal of collateral |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value Estimate | $ 1,599 | $ 1,621
Impaired loans | Appraisal of collateral | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Asset, measurement input (percent) |  | 0.05
Impaired loans | Appraisal of collateral | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Asset, measurement input (percent) |  | 0.25
Impaired loans | Appraisal of collateral | Discount Rate | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Asset, measurement input (percent) | 0.10 |
Impaired loans | Appraisal of collateral | 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 | $ 3,642 | $ 2,745
Mortgage servicing rights | Discounted cash flow | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Asset, measurement input (percent) | 0.0904 | 0.0956
Mortgage servicing rights | Discounted cash flow | Constant Prepayment Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Asset, measurement input (percent) | 0.1453 | 0.1802

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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. + Details
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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=123874694&loc=d3e19207-110258 + Details
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