v3.26.1
Loans Receivable and Allowance for Credit Losses (Gross Charge-offs) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Financing Receivable, Credit Quality Indicator [Line Items]        
Year One     $ 43 $ 35
Year Two     6 13
Year Three     93 4
Year Four     15 0
Year Five     23 0
Prior Years     28 115
Revolving Line of Credit     106 2
Revolving Line of Credit Converted to Term Loan     0 0
Total Charge-offs $ 150 $ 29 314 169
One- to Four-Family Segment [Member]        
Financing Receivable, Credit Quality Indicator [Line Items]        
Year One     0 0
Year Two     0 0
Year Three     12 0
Year Four     0 0
Year Five     0 0
Prior Years     0 113
Revolving Line of Credit     0 0
Revolving Line of Credit Converted to Term Loan     0 0
Total Charge-offs 0 0 12 113
One- to Four-Family Segment [Member] | Originated [Member]        
Financing Receivable, Credit Quality Indicator [Line Items]        
Year One     0 0
Year Two     0 0
Year Three     12 0
Year Four     0 0
Year Five     0 0
Prior Years     0 0
Revolving Line of Credit     0 0
Revolving Line of Credit Converted to Term Loan     0 0
Total Charge-offs     12 0
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]        
Financing Receivable, Credit Quality Indicator [Line Items]        
Year One     0 0
Year Two     0 0
Year Three     0 0
Year Four     0 0
Year Five     0 0
Prior Years     0 0
Revolving Line of Credit     0 0
Revolving Line of Credit Converted to Term Loan     0 0
Total Charge-offs     0 0
One- to Four-Family Segment [Member] | Bulk Purchased [Member]        
Financing Receivable, Credit Quality Indicator [Line Items]        
Year One     0 0
Year Two     0 0
Year Three     0 0
Year Four     0 0
Year Five     0 0
Prior Years     0 113
Revolving Line of Credit     0 0
Revolving Line of Credit Converted to Term Loan     0 0
Total Charge-offs     0 113
Commercial Segment [Member]        
Financing Receivable, Credit Quality Indicator [Line Items]        
Year One     0 0
Year Two     0 0
Year Three     81 0
Year Four     0 0
Year Five     16 0
Prior Years     25 0
Revolving Line of Credit     103 0
Revolving Line of Credit Converted to Term Loan     0 0
Total Charge-offs 123 0 225 0
Commercial Segment [Member] | Commercial Real Estate [Member]        
Financing Receivable, Credit Quality Indicator [Line Items]        
Year One     0 0
Year Two     0 0
Year Three     0 0
Year Four     0 0
Year Five     0 0
Prior Years     0 0
Revolving Line of Credit     50 0
Revolving Line of Credit Converted to Term Loan     0 0
Total Charge-offs 50 0 50 0
Commercial Segment [Member] | Commercial and Industrial [Member]        
Financing Receivable, Credit Quality Indicator [Line Items]        
Year One     0 0
Year Two     0 0
Year Three     81 0
Year Four     0 0
Year Five     16 0
Prior Years     25 0
Revolving Line of Credit     53 0
Revolving Line of Credit Converted to Term Loan     0 0
Total Charge-offs 73 0 175 0
Consumer Segment [Member]        
Financing Receivable, Credit Quality Indicator [Line Items]        
Year One     43 35
Year Two     6 13
Year Three     0 4
Year Four     15 0
Year Five     7 0
Prior Years     3 2
Revolving Line of Credit     3 2
Revolving Line of Credit Converted to Term Loan     0 0
Total Charge-offs $ 27 $ 29 77 56
Consumer Segment [Member] | Home Equity [Member]        
Financing Receivable, Credit Quality Indicator [Line Items]        
Year One     43 35
Year Two     6 12
Year Three     0 0
Year Four     0 0
Year Five     0 0
Prior Years     3 0
Revolving Line of Credit     3 0
Revolving Line of Credit Converted to Term Loan     0 0
Total Charge-offs     55 47
Consumer Segment [Member] | Other [Member]        
Financing Receivable, Credit Quality Indicator [Line Items]        
Year One     0 0
Year Two     0 1
Year Three     0 4
Year Four     15 0
Year Five     7 0
Prior Years     0 2
Revolving Line of Credit     0 2
Revolving Line of Credit Converted to Term Loan     0 0
Total Charge-offs     $ 22 $ 9