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ALLOWANCE FOR CREDIT LOSSES - Additional Information (Details) - USD ($)	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Financing Receivable Recorded Investment Past Due [Line Items]
Accrued interest receivable	$ 31,973,000		$ 30,676,000
Individually evaluated include Nonaccrual loans	80,000,000.0		60,600,000
Individually evaluated non accrual loans performing modified loans		$ 0
Allowance allocated to modified loans	229,000
Allowance for credit losses	$ 71,283,000	$ 67,984,000	$ 65,888,000	$ 68,592,000	$ 62,704,000	$ 60,829,000
Allowance for credit losses, percentage of loans	1.34%		1.21%
Multifamily Property [Member] | Maximum [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Allowance for credit losses, due to specific reserves	$ 33,300,000
Multifamily Property [Member] | Minimum [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Allowance for credit losses, due to specific reserves	16,700,000
Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Accrued interest receivable	$ 28,900,000		$ 27,800,000

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Percentage of allowance for credit loss to total financing receivable outstanding.

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

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