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FAIR VALUE MEASUREMENTS - Unobservable Inputs Non-recurring (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Other real estate owned | $ 2,455,000 | $ 2,351,000
Non-recurring | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Impaired loans | 14,382,000 | 15,213,000
Capitalized servicing rights | 4,108,000 | 4,882,000
Other real estate owned | 2,455,000 | 2,351,000
Total | 22,846,000 | 22,446,000
Carrying value of assets held for sale | 1,800,000 | 0
Non-recurring | Fair value of collateral -appraised value | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Impaired loans | 11,419,000 | 11,676,000
Other real estate owned | 2,455,000 | 2,351,000
Non-recurring | Discount cash flow | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Impaired loans | 2,963,000 | 3,537,000
Capitalized servicing rights | 4,108,000 | 4,882,000
Non-recurring | Valuation, market approach | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Appraised value | 136,000 |
Carrying value of assets held for sale | 1,901,000 |
Non-recurring | Minimum | Fair value of collateral -appraised value | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Appraised value | 0 |
Non-recurring | Maximum | Fair value of collateral -appraised value | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Appraised value | 6,915,000 |
Non-recurring | Maximum | Valuation, market approach | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Appraised value | 527,000 |
Non-recurring | Impaired loans | Minimum | Fair value of collateral -appraised value | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Appraised value |  | 0
Non-recurring | Impaired loans | Minimum | Discount cash flow | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Cash flows | 22,000 | 22,000
Non-recurring | Impaired loans | Maximum | Fair value of collateral -appraised value | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Appraised value |  | 6,915,000
Non-recurring | Impaired loans | Maximum | Discount cash flow | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Cash flows | 1,019,000 | 1,072,000
Non-recurring | Other real estate owned | Fair value of collateral -appraised value | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Appraised value | $ 2,695,000 | $ 2,700,000
Selling Costs |  | 12.93%
Non-recurring | Other real estate owned | Minimum | Fair value of collateral -appraised value | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Selling Costs | 6.00% |
Non-recurring | Other real estate owned | Maximum | Fair value of collateral -appraised value | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Selling Costs | 10.00% |
Loss severity | Non-recurring | Impaired loans | Minimum | Fair value of collateral -appraised value | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Loss severity | 0.00% | 0.00%
Loss severity | Non-recurring | Impaired loans | Maximum | Fair value of collateral -appraised value | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Loss severity | 61.00% | 55.00%
Constant prepayment rate (CPR) | Non-recurring | Capitalized servicing rights | Discount cash flow | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Constant prepayment rate (CPR) | 10.21% | 8.19%
Discount rate | Non-recurring | Impaired loans | Minimum | Discount cash flow | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Discount rate | 2.88% | 2.88%
Discount rate | Non-recurring | Impaired loans | Maximum | Discount cash flow | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Discount rate | 9.50% | 9.50%
Discount rate | Non-recurring | Capitalized servicing rights | Discount cash flow | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Discount rate | 10.08% | 10.08%

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