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Loans - Loan Modifications to Borrowers Experiencing Financial Difficulty and Pledged Loans (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($) loan	Jun. 30, 2025 USD ($)	Dec. 31, 2025 USD ($)
Loans
Nonaccrual Loans	$ 5,136		$ 5,136		$ 8,572
Current period gross charge-offs			$ 4,900		6,661
Multifamily \| Real Estate
Loans
Number of modified loans \| loan			1
Nonaccrual Loans	4,400		$ 4,400		7,836
Current period gross charge-offs			4,748		3,275
Multifamily \| Real Estate \| Modifications Due to Financial Difficulty
Loans
Modified loans, amount		$ 10,900		$ 10,900
Loan term increase from modifications		18 months		18 months
Nonaccrual Loans	7,800		7,800
Current period gross charge-offs	3,200		3,200
Multifamily \| Real Estate \| Loan Modifications - Note 1
Loans
Modified loans, amount		$ 8,000		$ 8,000
Multifamily \| Real Estate \| Loan Modifications - Note 2
Loans
Modified loans, amount		2,900		2,900
Modified loans charged-off		$ 2,900		$ 2,900
FHLB of New York
Loans
Loans Pledged to FHLB	346,200		346,200		319,400
Maximum borrowing capacity	$ 249,500		$ 249,500		$ 219,800