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FAIR VALUE OF FINANCIAL INSTRUMENTS - Mortgage Servicing Rights (Details) $ in Thousands	Sep. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
FAIR VALUE OF FINANCIAL INSTRUMENTS
Fair value	$ 7,936	$ 10,918
Recurring
FAIR VALUE OF FINANCIAL INSTRUMENTS
Fair value	7,936	10,918
Recurring | Level 3
FAIR VALUE OF FINANCIAL INSTRUMENTS
Fair value	$ 7,936	$ 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	$ 7,936	$ 10,918
Recurring | Level 3 | Constant pre-payment rates (CPR) | Minimum
FAIR VALUE OF FINANCIAL INSTRUMENTS
Measurement input	0.0710	0.0750
Recurring | Level 3 | Constant pre-payment rates (CPR) | Maximum
FAIR VALUE OF FINANCIAL INSTRUMENTS
Measurement input	0.6850	0.8760
Recurring | Level 3 | Constant pre-payment rates (CPR) | Weighted average
FAIR VALUE OF FINANCIAL INSTRUMENTS
Measurement input	0.141	0.089
Recurring | Level 3 | Discount rate | Minimum
FAIR VALUE OF FINANCIAL INSTRUMENTS
Measurement input	0.09	0.09
Recurring | Level 3 | Discount rate | Maximum
FAIR VALUE OF FINANCIAL INSTRUMENTS
Measurement input	0.11	0.11
Recurring | Level 3 | Discount rate | Weighted average
FAIR VALUE OF FINANCIAL INSTRUMENTS
Measurement input	0.090	0.090

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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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-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.

+ References

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
-Subparagraph (bbb)(1)
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