Investment Securities: Credit Loss by Portfolio Segment (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] | ||||
| Beginning Allowance | $ 31 | $ 50 | $ 36 | $ 60 |
| Recapture of Credit Losses | (1) | (4) | (6) | (14) |
| Ending Allowance | 30 | 46 | 30 | 46 |
| Private label residential | ||||
| Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] | ||||
| Beginning Allowance | 31 | 48 | 35 | 55 |
| Recapture of Credit Losses | (1) | (3) | (5) | (10) |
| Ending Allowance | 30 | 45 | 30 | 45 |
| Bank issued trust preferred securities | ||||
| Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] | ||||
| Beginning Allowance | 0 | 2 | 1 | 5 |
| Recapture of Credit Losses | 0 | (1) | (1) | (4) |
| Ending Allowance | $ 0 | $ 1 | $ 0 | $ 1 |