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Investment Securities: Unrealized Gain (Loss) on Investments (Details) $ in Thousands | Sep. 30, 2025 USD ($) security | Sep. 30, 2024 USD ($) security
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Held-to-maturity Securities, Fair Value: |  |
Estimated Fair Value - Less Than 12 Months | $ 843 | $ 805
Estimated Fair Value - 12 Months or Longer | 99,382 | 127,905
Total Estimated Fair Value | 100,225 | 128,710
Held-to-maturity Securities, Gross Unrealized Losses |  |
Gross Unrealized Losses - Less Than 12 Months | (6) | (6)
Gross Unrealized Losses - 12 Months or Longer | (4,937) | (6,567)
Total Gross Unrealized Losses | $ (4,943) | $ (6,573)
Held-to-maturity, Qty, Less Than 12 Months | security | 5 | 2
Held-to-maturity, Qty, 12 Months or Longer | security | 70 | 81
Estimated Fair Value - Less Than 12 Months | $ 15,899 | $ 13,330
Estimated Fair Value - 12 Months or Longer | 28,947 | 25,751
Total Estimated Fair Value | 44,846 | 39,081
Available-for-sale Securities, Gross Unrealized Losses: |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Accumulated Loss | (67) | (118)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (692) | (407)
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (759) | $ (525)
Available-for-sale, Qty, Less than 12 Months | security | 4,000 | 5
Available-for-sale, Qty, 12 Months or Longer | security | 24 | 23
U.S. Treasury and U.S. government agency securities |  |
Held-to-maturity Securities, Fair Value: |  |
Estimated Fair Value - Less Than 12 Months | $ 0 | $ 0
Estimated Fair Value - 12 Months or Longer | 56,960 | 78,363
Total Estimated Fair Value | 56,960 | 78,363
Held-to-maturity Securities, Gross Unrealized Losses |  |
Gross Unrealized Losses - Less Than 12 Months | 0 | 0
Gross Unrealized Losses - 12 Months or Longer | (2,760) | (4,197)
Total Gross Unrealized Losses | $ (2,760) | $ (4,197)
Held-to-maturity, Qty, Less Than 12 Months | security | 0 | 0
Held-to-maturity, Qty, 12 Months or Longer | security | 14 | 17
Estimated Fair Value - Less Than 12 Months | $ 3,977 | $ 1,962
Estimated Fair Value - 12 Months or Longer | 0 | 0
Total Estimated Fair Value | 3,977 | 1,962
Available-for-sale Securities, Gross Unrealized Losses: |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Accumulated Loss | 0 | (1)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 0 | $ (1)
Available-for-sale, Qty, Less than 12 Months | security | 1 | 1
Available-for-sale, Qty, 12 Months or Longer | security | 0 | 0
MBS: U.S. government agencies |  |
Held-to-maturity Securities, Fair Value: |  |
Estimated Fair Value - Less Than 12 Months | $ 7 | $ 1
Estimated Fair Value - 12 Months or Longer | 27,776 | 28,618
Total Estimated Fair Value | 27,783 | 28,619
Held-to-maturity Securities, Gross Unrealized Losses |  |
Gross Unrealized Losses - Less Than 12 Months | 0 | 0
Gross Unrealized Losses - 12 Months or Longer | (1,357) | (1,378)
Total Gross Unrealized Losses | $ (1,357) | $ (1,378)
Held-to-maturity, Qty, Less Than 12 Months | security | 1 | 1
Held-to-maturity, Qty, 12 Months or Longer | security | 42 | 44
Estimated Fair Value - Less Than 12 Months | $ 11,922 | $ 11,368
Estimated Fair Value - 12 Months or Longer | 28,947 | 25,751
Total Estimated Fair Value | 40,869 | 37,119
Available-for-sale Securities, Gross Unrealized Losses: |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Accumulated Loss | (67) | (117)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (692) | (407)
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (759) | $ (524)
Available-for-sale, Qty, Less than 12 Months | security | 3,000 | 4
Available-for-sale, Qty, 12 Months or Longer | security | 24 | 23
Private label residential |  |
Held-to-maturity Securities, Fair Value: |  |
Estimated Fair Value - Less Than 12 Months | $ 341 | $ 804
Estimated Fair Value - 12 Months or Longer | 14,646 | 20,447
Total Estimated Fair Value | 14,987 | 21,251
Held-to-maturity Securities, Gross Unrealized Losses |  |
Gross Unrealized Losses - Less Than 12 Months | (2) | (6)
Gross Unrealized Losses - 12 Months or Longer | (820) | (974)
Total Gross Unrealized Losses | $ (822) | $ (980)
Held-to-maturity, Qty, Less Than 12 Months | security | 3 | 1
Held-to-maturity, Qty, 12 Months or Longer | security | 14 | 19
Bank issued trust preferred securities |  |
Held-to-maturity Securities, Fair Value: |  |
Estimated Fair Value - Less Than 12 Months | $ 495 | $ 0
Estimated Fair Value - 12 Months or Longer | 0 | 477
Total Estimated Fair Value | 495 | 477
Held-to-maturity Securities, Gross Unrealized Losses |  |
Gross Unrealized Losses - Less Than 12 Months | (4) | 0
Gross Unrealized Losses - 12 Months or Longer | 0 | (18)
Total Gross Unrealized Losses | $ (4) | $ (18)
Held-to-maturity, Qty, Less Than 12 Months | security | 1 | 0
Held-to-maturity, Qty, 12 Months or Longer | security | 0 | 1

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