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Investment Securities: Unrealized Gain (Loss) on Investments (Details) $ in Thousands | Sep. 30, 2024 USD ($) security | Sep. 30, 2023 USD ($) security
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Held-to-maturity Securities, Fair Value: |  |
Estimated Fair Value - Less Than 12 Months | $ 805 | $ 27,175
Estimated Fair Value - 12 Months or Longer | 127,905 | 224,179
Total Estimated Fair Value | 128,710 | 251,354
Held-to-maturity Securities, Gross Unrealized Losses |  |
Gross Unrealized Losses - Less Than 12 Months | (6) | (680)
Gross Unrealized Losses - 12 Months or Longer | (6,567) | (16,067)
Total Gross Unrealized Losses | $ (6,573) | $ (16,747)
Held-to-maturity, Qty, Less Than 12 Months | security | 2 | 15
Held-to-maturity, Qty, 12 Months or Longer | security | 81 | 111
Estimated Fair Value - Less Than 12 Months | $ 13,330 | $ 10,635
Estimated Fair Value - 12 Months or Longer | 25,751 | 30,809
Total Estimated Fair Value | 39,081 | 41,444
Available-for-sale Securities, Gross Unrealized Losses: |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Accumulated Loss | (118) | (308)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (407) | (1,053)
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (525) | $ (1,361)
Available-for-sale, Qty, Less than 12 Months | security | 5,000 | 3
Available-for-sale, Qty, 12 Months or Longer | security | 23 | 27
U.S. Treasury and U.S. government agency securities |  |
Held-to-maturity Securities, Fair Value: |  |
Estimated Fair Value - Less Than 12 Months | $ 0 | $ 9,455
Estimated Fair Value - 12 Months or Longer | 78,363 | 152,082
Total Estimated Fair Value | 78,363 | 161,537
Held-to-maturity Securities, Gross Unrealized Losses |  |
Gross Unrealized Losses - Less Than 12 Months | 0 | (129)
Gross Unrealized Losses - 12 Months or Longer | (4,197) | (9,959)
Total Gross Unrealized Losses | $ (4,197) | $ (10,088)
Held-to-maturity, Qty, Less Than 12 Months | security | 0 | 1
Held-to-maturity, Qty, 12 Months or Longer | security | 17 | 26
Estimated Fair Value - Less Than 12 Months | $ 1,962 |
Estimated Fair Value - 12 Months or Longer | 0 |
Total Estimated Fair Value | 1,962 |
Available-for-sale Securities, Gross Unrealized Losses: |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Accumulated Loss | (1) |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (1) |
Available-for-sale, Qty, Less than 12 Months | security | 1 |
Available-for-sale, Qty, 12 Months or Longer | security | 0 |
U.S. government agencies |  |
Held-to-maturity Securities, Fair Value: |  |
Estimated Fair Value - Less Than 12 Months | $ 1 | $ 16,432
Estimated Fair Value - 12 Months or Longer | 28,618 | 31,703
Total Estimated Fair Value | 28,619 | 48,135
Held-to-maturity Securities, Gross Unrealized Losses |  |
Gross Unrealized Losses - Less Than 12 Months | 0 | (549)
Gross Unrealized Losses - 12 Months or Longer | (1,378) | (3,401)
Total Gross Unrealized Losses | $ (1,378) | $ (3,950)
Held-to-maturity, Qty, Less Than 12 Months | security | 1 | 13
Held-to-maturity, Qty, 12 Months or Longer | security | 44 | 51
Estimated Fair Value - Less Than 12 Months | $ 11,368 | $ 10,635
Estimated Fair Value - 12 Months or Longer | 25,751 | 30,809
Total Estimated Fair Value | 37,119 | 41,444
Available-for-sale Securities, Gross Unrealized Losses: |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Accumulated Loss | (117) | (308)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (407) | (1,053)
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (524) | $ (1,361)
Available-for-sale, Qty, Less than 12 Months | security | 4,000 | 3
Available-for-sale, Qty, 12 Months or Longer | security | 23 | 27
Private label residential |  |
Held-to-maturity Securities, Fair Value: |  |
Estimated Fair Value - Less Than 12 Months | $ 804 | $ 1,288
Estimated Fair Value - 12 Months or Longer | 20,447 | 38,205
Total Estimated Fair Value | 21,251 | 39,493
Held-to-maturity Securities, Gross Unrealized Losses |  |
Gross Unrealized Losses - Less Than 12 Months | (6) | (2)
Gross Unrealized Losses - 12 Months or Longer | (974) | (2,609)
Total Gross Unrealized Losses | $ (980) | $ (2,611)
Held-to-maturity, Qty, Less Than 12 Months | security | 1 | 1
Held-to-maturity, Qty, 12 Months or Longer | security | 19 | 32
Municipal securities |  |
Held-to-maturity Securities, Fair Value: |  |
Estimated Fair Value - Less Than 12 Months |  | $ 0
Estimated Fair Value - 12 Months or Longer |  | 1,740
Total Estimated Fair Value |  | 1,740
Held-to-maturity Securities, Gross Unrealized Losses |  |
Gross Unrealized Losses - Less Than 12 Months |  | 0
Gross Unrealized Losses - 12 Months or Longer |  | (47)
Total Gross Unrealized Losses |  | $ (47)
Held-to-maturity, Qty, Less Than 12 Months | security |  | 0
Held-to-maturity, Qty, 12 Months or Longer | security |  | 1
Bank issued trust preferred securities |  |
Held-to-maturity Securities, Fair Value: |  |
Estimated Fair Value - Less Than 12 Months | $ 0 | $ 0
Estimated Fair Value - 12 Months or Longer | 477 | 449
Total Estimated Fair Value | 477 | 449
Held-to-maturity Securities, Gross Unrealized Losses |  |
Gross Unrealized Losses - Less Than 12 Months | 0 | 0
Gross Unrealized Losses - 12 Months or Longer | (18) | (51)
Total Gross Unrealized Losses | $ (18) | $ (51)
Held-to-maturity, Qty, Less Than 12 Months | security | 0 | 0
Held-to-maturity, Qty, 12 Months or Longer | security | 1 | 1

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