Loans Receivable and Allowance for Expected Credit Losses - Summary of Loans Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	$ 92,535	$ 94,638
Deferred loan fees, net	(96)	(100)
Loan discount	(226)	(211)
Allowance for expected credit losses	(1,150)	(1,156)	$ (1,501)
Loans, net	91,063	93,171
Non-profit Commercial Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	81,917	83,960
Allowance for expected credit losses	(1,121)	(1,119)	(1,471)
Non-profit Commercial Loans \| Real estate secured
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	81,882	83,912
Non-profit Commercial Loans \| Unsecured
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	35	48
For-profit Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	10,616	10,678
Allowance for expected credit losses	(29)	(37)	$ (30)
For-profit Commercial \| Real estate secured
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	$ 10,616	$ 10,678

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amortized cost excluding accrued interest, after allowance for credit loss, of 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 of unamortized loan commitment, origination, and other costs (fees) on financing receivable recognized as adjustment to yield. Excludes financing receivable covered under loss sharing agreement.

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Amount of unamortized purchase premium (discount) on financing receivable. Excludes financing receivable covered under loss sharing agreement.

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