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LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Additional Information (Details) - USD ($)		3 Months Ended		9 Months Ended
	Jul. 23, 2025	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans receivable		$ 6,468,196,000		$ 6,468,196,000		$ 4,608,956,000
Allowance for credit losses		19,400,000		20,300,000
Initial Allowance on ESSA PCD Acquired Loans		1,857,000		1,857,000
Provision for credit loss expense		18,456,000	$ 2,381,000	24,350,000	$ 6,292,000
Provision for (benefit from) unfunded commitments		1,000	49,000	181,000	$ 112,000
Financing receivable, excluding accrued interest, modified, subsequent default		0	$ 0
Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
Initial Allowance on ESSA PCD Acquired Loans	$ 1,900,000
Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
Initial Allowance on ESSA PCD Acquired Loans	$ 16,400,000			16,400,000
Syndicated Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans receivable		71,852,000		71,852,000		79,882,000
Unfunded Loan Commitment
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable excluding accrued interest modified accumulated				0
Commercial and Industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans receivable		762,736,000		762,736,000		718,775,000
Initial Allowance on ESSA PCD Acquired Loans		244,000		244,000
Commercial and Industrial | Syndicated Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans receivable		$ 71,900,000		$ 71,900,000		$ 79,900,000

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

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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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Amount, excluding accrued interest, of allowance for credit loss at acquisition date of financing receivable purchased with credit deterioration. Excludes net investment in lease.

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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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