DERIVATIVES - Non-Designated Hedges (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Derivatives
Notional amounts	$ 918,800		$ 823,900
Loan Swap Fees	1,231	$ 1,115
Loan customers
Derivatives
Notional amounts	459,400		411,900
Bank counterparties
Derivatives
Notional amounts	459,400		411,900
Interest rate swaps \| Non-Designated Hedges
Derivatives
Notional amounts	$ 918,770		$ 823,894
Weighted average pay rates (as a percent)	3.36%		3.75%
Weighted average receive rates (as a percent)	3.36%		3.75%
Weighted average maturity	10 years 5 months 27 days		10 years 9 months 7 days
Fair value of combined interest rate swaps	$ 0		$ 0

Represents the percentage of weighted average pay rates related to derivative instruments.

No definition available.

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- Definition

Represents the percentage of weighted average receive rates related to derivative instruments.

+ References

No definition available.

+ Details

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- Definition

Non-interest income derived from loan swaps

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Nominal or face amount used to calculate payments on the derivative asset.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

+ Details

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Period Type:	instant

- Definition

Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- 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.

+ Details

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- Definition

Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities.

+ References

No definition available.

+ Details

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Balance Type:	credit
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- Details

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- Details

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- Details

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