v3.26.1
Loans Receivable and Allowance for Credit Losses (Gross Charge-offs) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2026
Mar. 31, 2025
Financing Receivable, Credit Quality Indicator [Line Items]        
Year One     $ 16 $ 8
Year Two     6 13
Year Three     89 4
Year Four     15 0
Year Five     7 0
Prior Years     28 113
Revolving Line of Credit     3 2
Revolving Line of Credit Converted to Term Loan     0 0
Total Charge-offs $ 41 $ 123 164 140
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 12 113 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     77 0
Year Four     0 0
Year Five     0 0
Prior Years     25 0
Revolving Line of Credit     0 0
Revolving Line of Credit Converted to Term Loan     0 0
Total Charge-offs 0 0 102 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     0 0
Revolving Line of Credit Converted to Term Loan     0 0
Total Charge-offs 0 0 0 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     77 0
Year Four     0 0
Year Five     0 0
Prior Years     25 0
Revolving Line of Credit     0 0
Revolving Line of Credit Converted to Term Loan     0 0
Total Charge-offs 0 0 102 0
Consumer Segment [Member]        
Financing Receivable, Credit Quality Indicator [Line Items]        
Year One     16 8
Year Two     6 13
Year Three     0 4
Year Four     15 0
Year Five     7 0
Prior Years     3 0
Revolving Line of Credit     3 2
Revolving Line of Credit Converted to Term Loan     0 0
Total Charge-offs $ 29 $ 10 50 27
Consumer Segment [Member] | Home Equity [Member]        
Financing Receivable, Credit Quality Indicator [Line Items]        
Year One     16 8
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     28 20
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 0
Revolving Line of Credit     0 2
Revolving Line of Credit Converted to Term Loan     0 0
Total Charge-offs     $ 22 $ 7