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VARIABLE INTEREST ENTITIES - Summary of Unconsolidated VIEs (Details) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Variable Interest Entity [Line Items]
Loss on investments in alternative energy partnerships	$ (355,000)	$ 1,950,000	$ 1,808,000	$ 1,595,000	$ 1,774,000
Tax credit	1,700,000		1,900,000	1,700,000	9,200,000
Funding of equity investment				1,501,000	1,864,000
Affordable Housing Fund Investment
Variable Interest Entity [Line Items]
Total amount funded	18,200,000			18,200,000
Aggregate funding commitment	29,300,000			29,300,000
Funding of equity investment	0		1,600,000	454,000	1,600,000
Amortization expense	553,000		477,000	1,200,000	974,000
Alternative investments unfunded investment commitments	11,100,000			11,100,000
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Funding	235,000		13,000	235,000	30,900,000
Return of capital	0		1,000,000.0	0	1,000,000.0
Loss on investments in alternative energy partnerships	(400,000)		1,800,000	1,600,000	(1,800,000)
Tax credit	1,700,000		1,900,000	1,700,000	9,200,000
Cash	3,610,000			3,610,000		$ 3,012,000
Equipment, net of depreciation	252,888,000			252,888,000		259,464,000
Other assets	4,842,000			4,842,000		4,470,000
Total unconsolidated assets	261,340,000			261,340,000		266,946,000
Total unconsolidated liabilities	6,166,000			6,166,000		6,269,000
Maximum loss exposure	30,429,000			30,429,000		28,988,000
Variable Interest Entity, Not Primary Beneficiary | Affordable Housing Fund Investment
Variable Interest Entity [Line Items]
Tax credit	554,000		466,000	1,100,000	941,000
Maximum loss exposure	18,800,000			18,800,000		$ 20,000,000.0
Variable Interest Entity, Not Primary Beneficiary | Other Assets
Variable Interest Entity [Line Items]
Total unconsolidated assets	$ 26,600,000		$ 44,800,000	$ 26,600,000	$ 44,800,000

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