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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Investments in Real Estate Partnerships (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 investment
Accounting Policies [Abstract]
Limited partner interest (as a percent)			99.00%
Number of investments accounted for under the proportional amortization method | investment				1
Recorded investment in real estate partnerships	$ 3,872	$ 4,416
Investments accounted for under proportional amortization method	1,562	1,776
Losses accounted for under the equity method	331	277	$ 350
Losses on investments accounted for under proportional amortization method	214	217	191
Federal tax credits	$ 578	$ 1,010	$ 736

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Amount of affordable housing tax credits and other tax benefits recognized.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 740
-Section 50
-Paragraph 2
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Amount of investment in qualified affordable housing projects.

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-SubTopic 740
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Amount, before tax, of net income (loss) derived from real estate held for development and sale, and related investments.

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Income (Loss) From Affordable Housing Projects, Proportional Amortization Method

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Investment in real estate partnership.

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Investments In Affordable Housing Projects, Proportional Amortization Method

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Percentage of limited partner interest.

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