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LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Additional Information (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) loan	Sep. 30, 2021 USD ($) loan	Sep. 30, 2022 USD ($) loan	Sep. 30, 2021 USD ($) loan	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss	$ 41,269,000	$ 37,230,000	$ 41,269,000	$ 37,230,000	$ 40,543,000	$ 37,588,000	$ 36,908,000	$ 34,340,000
Loans receivable	4,024,665,000		4,024,665,000			3,634,792,000
Provision for credit loss expense	1,091,000	1,100,000	5,639,000	5,189,000
Allowance for unfunded commitments	55,000	$ 0	641,000	$ 0
Amortized cost in troubled debt restructurings	13,500,000		13,500,000			16,600,000
Financing receivable, troubled debt restructuring, allowance for loans	$ 2,200,000		$ 2,200,000			2,600,000
Financing receivable, modifications, number of contracts | loan	1	0	2	3
Minimum period to be considered for loan to have defaulted			90 days
Loans modified as troubled debt restructuring with subsequent defaults | loan	0	0	0	0
Principal balances forgiven in connection with loan restructuring	$ 0	$ 0	$ 0	$ 0
PPP loans, net of deferred processing fees
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans receivable	462,000		462,000			45,203,000
Syndicated loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans receivable	152,783,000		152,783,000			125,761,000
Commercial and Industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss	9,566,000	$ 8,330,000	9,566,000	$ 8,330,000	$ 9,555,000	8,837,000	$ 7,312,000	$ 6,233,000
Loans receivable	$ 760,975,000		$ 760,975,000			708,989,000
Financing receivable, modifications, number of contracts | loan	1		1	1
Commercial and Industrial | PPP loans, net of deferred processing fees
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss	$ 0		$ 0			0
Loans receivable	462,000		462,000			45,200,000
Commercial and Industrial | Syndicated loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans receivable	$ 152,800,000		$ 152,800,000			$ 125,800,000

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Minimum period to be considered for loan to have defaulted.

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Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
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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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-Publisher FASB
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Number of financing receivables that have been modified by troubled debt restructurings.

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-Publisher FASB
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-Topic 310
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Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

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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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