Credit Quality and Allowance for Credit Losses -Summary of Aging Analysis of Loans (Details) $ in Thousands	Sep. 30, 2026 USD ($)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	$ 27,990
One- to four-family first mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	709
Home equity loans and lines
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	7,156
Construction and land
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	3,203
Multi-family residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	371
Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	16,551
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	201
30-89 Days Past Due \| One- to four-family first mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	142
30-89 Days Past Due \| Home equity loans and lines
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
30-89 Days Past Due \| Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	59
30-89 Days Past Due \| Construction and land
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
30-89 Days Past Due \| Multi-family residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
30-89 Days Past Due \| Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
30-89 Days Past Due \| Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
90+ Days Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
90+ Days Past Due and Accruing \| One- to four-family first mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
90+ Days Past Due and Accruing \| Home equity loans and lines
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
90+ Days Past Due and Accruing \| Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
90+ Days Past Due and Accruing \| Construction and land
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
90+ Days Past Due and Accruing \| Multi-family residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
90+ Days Past Due and Accruing \| Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
90+ Days Past Due and Accruing \| Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
Nonaccrual
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	9,019
Nonaccrual \| One- to four-family first mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	567
Nonaccrual \| Home equity loans and lines
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
Nonaccrual \| Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	1,417
Nonaccrual \| Construction and land
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	2,724
Nonaccrual \| Multi-family residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	371
Nonaccrual \| Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	3,940
Nonaccrual \| Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	18,770
Current \| One- to four-family first mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
Current \| Home equity loans and lines
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
Current \| Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	5,680
Current \| Construction and land
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	479
Current \| Multi-family residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
Current \| Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	12,611
Current \| Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	$ 0