Credit Quality and Allowance for Credit Losses - Summary of Financial Impacts of Loan Modifications (Details) $ in Thousands	9 Months Ended
Sep. 30, 2026 USD ($)	Sep. 30, 2025 USD ($)
One- to four-family first mortgage \| Payment Deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
Payment Deferral (dollars in thousands)	$ 15	$ 0
One- to four-family first mortgage \| Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Term Extension (in months)	3 months	60 months
Weighted-Average Interest Rate Reduction	0	0
Home equity loans and lines \| Payment Deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
Payment Deferral (dollars in thousands)	$ 0	$ 0
Home equity loans and lines \| Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Term Extension (in months)	0 months	24 months
Weighted-Average Interest Rate Reduction	0	0
Commercial real estate \| Payment Deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
Payment Deferral (dollars in thousands)	$ 3	$ 179
Commercial real estate \| Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Term Extension (in months)	7 months	46 months
Weighted-Average Interest Rate Reduction	0	0.020
Construction and land \| Payment Deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
Payment Deferral (dollars in thousands)	$ 69	$ 165
Construction and land \| Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Term Extension (in months)	4 months	6 months
Weighted-Average Interest Rate Reduction	0	0
Multi-family residential \| Payment Deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
Payment Deferral (dollars in thousands)	$ 0	$ 165
Multi-family residential \| Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Term Extension (in months)	4 months	0 months
Weighted-Average Interest Rate Reduction	0	0
Commercial and industrial \| Payment Deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
Payment Deferral (dollars in thousands)	$ 84	$ 0
Commercial and industrial \| Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Term Extension (in months)	4 months	7 months
Weighted-Average Interest Rate Reduction	0.015	0.015
Consumer \| Payment Deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
Payment Deferral (dollars in thousands)	$ 0	$ 0
Consumer \| Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Term Extension (in months)	0 months	0 months
Weighted-Average Interest Rate Reduction	0	0

Financing Receivable, Excluding Accrued Interest, Modified, Term Increase From Modification

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- Definition

Financing Receivable, Excluding Accrued Interest, Modified, Weighted Average Interest Rate Decrease from Modification

+ References

No definition available.

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- Definition

Amount of increase (decrease) in amortized cost excluding accrued interest, of financing receivable modified for debtor experiencing financial difficulty.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
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