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Loans Receivable and Allowance for Credit Losses - Recorded investment in loans by credit quality indicator (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Jun. 30, 2025
Credit quality indicator by year of origination    
Total $ 368,253 $ 380,572
One-to-Four Family Mortgages    
Credit quality indicator by year of origination    
Year 1 10,209 7,345
Year 2 22,131 13,833
Year 3 40,741 23,073
Year 4 57,154 39,958
Year 5 47,008 54,815
Prior 155,416 195,298
Total 332,659 334,322
One-to-Four Family Mortgages | Pass    
Credit quality indicator by year of origination    
Year 1 10,209 7,345
Year 2 22,131 13,833
Year 3 39,963 23,073
Year 4 55,912 39,493
Year 5 46,651 53,588
Prior 152,989 193,428
Total 327,855 330,760
One-to-Four Family Mortgages | Special Mention    
Credit quality indicator by year of origination    
Year 3 778  
Year 4 836 465
Year 5 357 827
Prior 1,877 1,355
Total 3,848 2,647
One-to-Four Family Mortgages | Substandard    
Credit quality indicator by year of origination    
Year 4 406  
Year 5   400
Prior 550 515
Total 956 915
Home Equity Lines of Credit    
Credit quality indicator by year of origination    
Year 1 378 856
Year 2 66 548
Year 3 82 66
Year 4   78
Prior 531 560
Revolving 6,895 7,725
Total 7,952 9,833
Current Period Gross Write-Offs    
Current Period Gross Write-Offs, Revolving 3  
Current Period Gross Write-Offs, Total 3  
Home Equity Lines of Credit | Pass    
Credit quality indicator by year of origination    
Year 1 378 856
Year 2 66 548
Year 3 82 66
Year 4   78
Prior 531 560
Revolving 6,819 7,649
Total 7,876 9,757
Home Equity Lines of Credit | Special Mention    
Credit quality indicator by year of origination    
Revolving 76 76
Total 76 76
Construction Loans    
Credit quality indicator by year of origination    
Year 1 7,385 5,981
Year 2 1,360 7,914
Year 3 181 170
Year 4 400 59
Year 5 113 365
Prior 149 222
Total 9,588 14,711
Construction Loans | Pass    
Credit quality indicator by year of origination    
Year 1 7,385 5,981
Year 2 1,360 7,914
Year 3 62 170
Year 4 400 59
Year 5 113 365
Prior 149 222
Total 9,469 14,711
Construction Loans | Substandard    
Credit quality indicator by year of origination    
Year 3 119  
Total 119  
Consumer Loans    
Credit quality indicator by year of origination    
Year 1 3,002 777
Year 2 236 2,594
Year 3 55 215
Year 4 35 34
Year 5 71 33
Prior 300 315
Total 3,699 3,968
Consumer Loans | Pass    
Credit quality indicator by year of origination    
Year 1 3,002 777
Year 2 236 2,594
Year 3 55 215
Year 4 35 34
Year 5 71 33
Prior 300 315
Total 3,699 3,968
Commercial Loans    
Credit quality indicator by year of origination    
Year 1 5,119 4,604
Year 2 6,004 4,596
Year 3 3,133 5,499
Year 4   2,946
Prior 99 93
Total 14,355 17,738
Commercial Loans | Pass    
Credit quality indicator by year of origination    
Year 1 5,119 4,604
Year 2 6,004 4,596
Year 3 3,133 5,499
Year 4   2,946
Prior 99 93
Total $ 14,355 $ 17,738