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LOANS AND LEASES - Additional Information (Details)	3 Months Ended		9 Months Ended	12 Months Ended
	Sep. 30, 2025 USD ($)	Jun. 30, 2025 Loan	Sep. 30, 2025 USD ($) Loan	Dec. 31, 2024 USD ($)
Financing Receivable Recorded Investment Past Due [Line Items]
Loan receivable, validate risk ratings performed for large sample or new lending to existing relationships	$ 1,000,000		$ 1,000,000
Loan receivable, validate risk ratings performed for criticized and classified rated borrowers with relationship exposure, value	500,000		500,000
Loan receivable, validate risk ratings performed for new federal reserve board regulation "O" loan commitments, value	1,000,000		1,000,000
Loan receivable validate risk ratings performed for leveraged loans, value	1,000,000		1,000,000
Loan receivable validate risk ratings performed for no borrower with commitments, value	500,000		500,000
Allowance for credit losses, recorded investment nonaccrual status	84,142,000		$ 84,142,000	$ 100,168,000
Primary Residential Mortgages [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Number of loans modified | Loan			3
Financing receivable modified in period amount			$ 691,000
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing receivable increase in special mention loans			12,800,000
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Allowance for credit losses, recorded investment nonaccrual status	23,582,000		23,582,000	30,881,000
Multifamily Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing receivable modified in period amount			$ 100,200,000
Commercial and Industrial Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Number of loans modified | Loan			3
Financing receivable modified in period amount			$ 10,900,000
Substandard [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing receivable individually evaluated loan			84,100,000	$ 99,800,000
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing receivable increase in special mention loans	20,100,000
Substandard [Member] | Multifamily Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing receivable increase in special mention loans	11,800,000
Number of multifamily loans | Loan		3
Minimum [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loan receivable, validate risk ratings performed for large sample of borrowers with relationship, value	1,000,000		1,000,000
Maximum [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loan receivable, validate risk ratings performed for small sample of borrowers with relationship, value	$ 1,000,000		$ 1,000,000

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