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FAIR VALUE MEASUREMENTS - Significant Unobservable Inputs for Non-recurring Assets (Details) $ in Thousands	Dec. 31, 2019 USD ($) $ / contract	Dec. 31, 2018 USD ($) $ / contract
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Capitalized servicing rights	$ 12,300	$ 11,500
Non-recurring | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans	8,831	4,892
Capitalized servicing rights	14,152	11,891
Total Assets	22,983	16,783
Non-recurring | Fair value of collateral | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans	$ 8,831	$ 4,892
Non-recurring | Minimum | Loss severity | Fair value of collateral | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans	0.0012	0.0000
Non-recurring | Minimum | Appraised value | Fair value of collateral | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans | $ / contract	8,200	300
Non-recurring | Maximum | Loss severity | Fair value of collateral | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans	0.1572	0.5116
Non-recurring | Maximum | Appraised value | Fair value of collateral | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans | $ / contract	1,548,000	877,000
Non-recurring | Weighted Average | Loss severity | Fair value of collateral | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans	0.0450	0.0675
Non-recurring | Weighted Average | Appraised value | Fair value of collateral | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans | $ / contract	736,000	363,000
Non-recurring | Capitalized servicing rights | Discounted Cash Flow | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Capitalized servicing rights	$ 14,152	$ 11,891
Non-recurring | Capitalized servicing rights | Minimum | CPR | Discounted Cash Flow | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Capitalized servicing rights	0.0944	0.0774
Non-recurring | Capitalized servicing rights | Minimum | Discount rate | Discounted Cash Flow | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Capitalized servicing rights	0.1000	0.1000
Non-recurring | Capitalized servicing rights | Maximum | CPR | Discounted Cash Flow | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Capitalized servicing rights	0.1412	0.1129
Non-recurring | Capitalized servicing rights | Maximum | Discount rate | Discounted Cash Flow | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Capitalized servicing rights	0.1350	0.1413
Non-recurring | Capitalized servicing rights | Weighted Average | CPR | Discounted Cash Flow | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Capitalized servicing rights	0.1225	0.0974
Non-recurring | Capitalized servicing rights | Weighted Average | Discount rate | Discounted Cash Flow | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Capitalized servicing rights	0.1178	0.1199

X

- Definition

Impaired Financing Receivables, Measurement Input

+ References

No definition available.

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- Definition

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- 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

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745

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- Definition

Value of input used to measure servicing asset.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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