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FAIR VALUE MEASUREMENTS - Unobservable Inputs Non-recurring (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |  |
Other real estate owned | $ 2,351 | $ 2,351 |
Non-recurring | Level 3 |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |  |
Total | 21,604 | 22,446 |
Non-recurring | Fair value of collateral -appraised value | Level 3 |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |  |
Impaired loans | 11,122 | 11,676 |
Other real estate owned | 2,351 | 2,351 |
Non-recurring | Discount cash flow | Level 3 |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |  |
Impaired loans | 3,473 | 3,537 |
Capitalized servicing rights | 4,658 | 4,882 |
Non-recurring | Impaired loans | Level 3 |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |  |
Impaired loans | $ 14,595 | 15,213 |
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%
Appraised value | $ 150 |  | $ 0
Non-recurring | Impaired loans | Minimum | Discount cash flow | Level 3 |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |  |
Cash flows | 22 |  | 22
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 |  | 6,915
Non-recurring | Impaired loans | Maximum | Discount cash flow | Level 3 |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |  |
Cash flows | 1,090 |  | 1,072
Non-recurring | Capitalized servicing rights | Level 3 |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |  |
Capitalized servicing rights | 4,658 | 4,882 |
Non-recurring | Other real estate owned | Level 3 |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |  |
Other real estate owned | 2,351 | $ 2,351 |
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 | $ 2,700 |  | $ 2,700
Selling Costs | 12.93% |  | 12.93%
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 | 55.00% |  | 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} |  |  |
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed | 8.68% | 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 | 7.00% |  | 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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