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

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Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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Percentage of contractually collectible principal associated with a financial asset expected not to be collected due to default by the borrower.

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