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FAIR VALUE OF FINANCIAL INSTRUMENTS - Mortgage Servicing Rights (Details) $ in Thousands	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
FAIR VALUE OF FINANCIAL INSTRUMENTS
Fair value	$ 8,518	$ 10,918
Recurring
FAIR VALUE OF FINANCIAL INSTRUMENTS
Fair value	8,518	10,918
Recurring | Level 3
FAIR VALUE OF FINANCIAL INSTRUMENTS
Fair value	$ 8,518	$ 10,918
Valuation Technique	us-gaap:ValuationTechniqueDiscountedCashFlowMember	us-gaap:ValuationTechniqueDiscountedCashFlowMember
Recurring | Level 3 | Constant pre-payment rates (CPR)
FAIR VALUE OF FINANCIAL INSTRUMENTS
Fair value	$ 8,518	$ 10,918
Recurring | Level 3 | Constant pre-payment rates (CPR) | Minimum
FAIR VALUE OF FINANCIAL INSTRUMENTS
Measurement input	0.070	0.075
Recurring | Level 3 | Constant pre-payment rates (CPR) | Maximum
FAIR VALUE OF FINANCIAL INSTRUMENTS
Measurement input	0.685	0.876
Recurring | Level 3 | Constant pre-payment rates (CPR) | Weighted average
FAIR VALUE OF FINANCIAL INSTRUMENTS
Measurement input	0.123	0.089
Recurring | Level 3 | Discount rate | Minimum
FAIR VALUE OF FINANCIAL INSTRUMENTS
Measurement input	0.090	0.090
Recurring | Level 3 | Discount rate | Maximum
FAIR VALUE OF FINANCIAL INSTRUMENTS
Measurement input	0.110	0.110
Recurring | Level 3 | Discount rate | Weighted average
FAIR VALUE OF FINANCIAL INSTRUMENTS
Measurement input	0.090	0.090

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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.

+ 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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122625-111746

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Value of input used to measure servicing asset.

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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=117815213&loc=d3e19207-110258

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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