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LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Additional Information (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($) loan	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($) loan	Dec. 31, 2022 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans receivable	$ 4,492,174,000		$ 4,492,174,000		$ 4,275,178,000
Provision for credit loss expense	1,056,000	$ 1,091,000	4,751,000	$ 5,639,000
Allowance for unfunded commitments	33,000	$ 55,000	148,000	$ 641,000
Amortized cost in troubled debt restructurings					12,400,000
Financing receivable, troubled debt restructuring, allowance for loans					2,200,000
Financing receivable, modifications, number of contracts | loan		1		2
Minimum period to be considered for loan to have defaulted				90 days
Loans modified as troubled debt restructuring with subsequent defaults | loan		0		0
Principal balances forgiven in connection with loan restructuring		$ 0		$ 0
Syndicated loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans receivable	123,090,000		123,090,000		156,649,000
Unfunded Loan Commitment
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable excluding accrued interest modified accumulated			167,000
Commercial and Industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans receivable	730,542,000		730,542,000		791,911,000
Financing receivable, modifications, number of contracts | loan		1		1
Commercial and Industrial | Syndicated loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans receivable	$ 123,100,000		$ 123,100,000		$ 156,600,000

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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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479344/326-20-45-1

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
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Amount of expense (reversal of expense) for expected credit loss for off-balance sheet credit exposure. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
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