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FAIR VALUES OF FINANCIAL INSTRUMENTS - Quantitative Information About Level 3 Fair Value Measurements (Details) $ in Thousands	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Mortgage servicing rights, at fair value	$ 1,157	$ 1,770	$ 31,852	$ 76,121
Significant Unobservable Inputs (Level 3)
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Mortgage servicing rights, at fair value	1,157	1,704
Recurring | Significant Unobservable Inputs (Level 3)
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Mortgage servicing rights, at fair value	1,157	1,770
Recurring | Significant Unobservable Inputs (Level 3) | Mortgage Servicing Rights
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Mortgage servicing rights, at fair value	$ 2,323	$ 3,362
Recurring | Significant Unobservable Inputs (Level 3) | Mortgage Servicing Rights | Discounted cash flow | Discount Rate | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Measurement input (percent)	0.0875	0.0950
Recurring | Significant Unobservable Inputs (Level 3) | Mortgage Servicing Rights | Discounted cash flow | Discount Rate | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Measurement input (percent)	0.1300	0.1300
Recurring | Significant Unobservable Inputs (Level 3) | Mortgage Servicing Rights | Discounted cash flow | Discount Rate | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Measurement input (percent)	0.1155	0.1127
Recurring | Significant Unobservable Inputs (Level 3) | Mortgage Servicing Rights | Discounted cash flow | Prepayment Rate | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Measurement input (percent)	0.0800	0.0800
Recurring | Significant Unobservable Inputs (Level 3) | Mortgage Servicing Rights | Discounted cash flow | Prepayment Rate | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Measurement input (percent)	0.6634	0.6634
Recurring | Significant Unobservable Inputs (Level 3) | Mortgage Servicing Rights | Discounted cash flow | Prepayment Rate | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Measurement input (percent)	0.1522	0.1267

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-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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- Definition

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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