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Investment Securities: Unrealized Gain (Loss) on Investments (Details) $ in Thousands | Sep. 30, 2022 USD ($) security | Sep. 30, 2021 USD ($) security
--- | --- | ---
Held-to-maturity Securities, Fair Value: |  |
Estimated Fair Value - Less Than 12 Months | $ 189,351 | $ 36,598
Estimated Fair Value - 12 Months or Longer | 47,652 | 16
Total Estimated Fair Value | 237,003 | 36,614
Held-to-maturity Securities, Gross Unrealized Losses |  |
Gross Unrealized Losses - Less Than 12 Months | (10,937) | (244)
Gross Unrealized Losses - 12 Months or Longer | (6,148) | 0
Total Gross Unrealized Losses | $ (17,085) | $ (244)
Held-to-maturity, Qty, Less Than 12 Months | security | 100 | 14
Held-to-maturity, Qty, 12 Months or Longer | security | 20 | 4
Estimated Fair Value - Less Than 12 Months | $ 25,170 | $ 20,146
Estimated Fair Value - 12 Months or Longer | 15,705 | 5,491
Total Estimated Fair Value | 40,875 | 25,637
Available-for-sale Securities, Gross Unrealized Losses: |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Accumulated Loss | (292) | (103)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (602) | (11)
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (894) | $ (114)
Available-for-sale, Qty, Less than 12 Months | security | 16 | 13
Available-for-sale, Qty, 12 Months or Longer | security | 13 | 3
U.S. Treasury and U.S. government agency securities |  |
Held-to-maturity Securities, Fair Value: |  |
Estimated Fair Value - Less Than 12 Months | $ 115,504 | $ 18,795
Estimated Fair Value - 12 Months or Longer | 33,638 | 0
Total Estimated Fair Value | 149,142 | 18,795
Held-to-maturity Securities, Gross Unrealized Losses |  |
Gross Unrealized Losses - Less Than 12 Months | (7,224) | (99)
Gross Unrealized Losses - 12 Months or Longer | (4,885) | 0
Total Gross Unrealized Losses | $ (12,109) | $ (99)
Held-to-maturity, Qty, Less Than 12 Months | security | 17 | 5
Held-to-maturity, Qty, 12 Months or Longer | security | 9 | 0
Mortgage-backed securities, U.S. government agencies |  |
Held-to-maturity Securities, Fair Value: |  |
Estimated Fair Value - Less Than 12 Months | $ 35,896 | $ 8,091
Estimated Fair Value - 12 Months or Longer | 5,306 | 15
Total Estimated Fair Value | 41,202 | 8,106
Held-to-maturity Securities, Gross Unrealized Losses |  |
Gross Unrealized Losses - Less Than 12 Months | (1,449) | (122)
Gross Unrealized Losses - 12 Months or Longer | (1,037) | 0
Total Gross Unrealized Losses | $ (2,486) | $ (122)
Held-to-maturity, Qty, Less Than 12 Months | security | 54 | 5
Held-to-maturity, Qty, 12 Months or Longer | security | 5 | 3
Estimated Fair Value - Less Than 12 Months | $ 25,170 | $ 20,146
Estimated Fair Value - 12 Months or Longer | 15,705 | 5,491
Total Estimated Fair Value | 40,875 | 25,637
Available-for-sale Securities, Gross Unrealized Losses: |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Accumulated Loss | (292) | (103)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (602) | (11)
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (894) | $ (114)
Available-for-sale, Qty, Less than 12 Months | security | 16 | 13
Available-for-sale, Qty, 12 Months or Longer | security | 13 | 3
Mortgage-backed securities, Private label residential |  |
Held-to-maturity Securities, Fair Value: |  |
Estimated Fair Value - Less Than 12 Months | $ 35,447 | $ 9,712
Estimated Fair Value - 12 Months or Longer | 8,708 | 1
Total Estimated Fair Value | 44,155 | 9,713
Held-to-maturity Securities, Gross Unrealized Losses |  |
Gross Unrealized Losses - Less Than 12 Months | (2,166) | (23)
Gross Unrealized Losses - 12 Months or Longer | (226) | 0
Total Gross Unrealized Losses | $ (2,392) | $ (23)
Held-to-maturity, Qty, Less Than 12 Months | security | 27 | 4
Held-to-maturity, Qty, 12 Months or Longer | security | 6 | 1
Taxable municipal securities |  |
Held-to-maturity Securities, Fair Value: |  |
Estimated Fair Value - Less Than 12 Months | $ 2,035 |
Estimated Fair Value - 12 Months or Longer | 0 |
Total Estimated Fair Value | 2,035 |
Held-to-maturity Securities, Gross Unrealized Losses |  |
Gross Unrealized Losses - Less Than 12 Months | (67) |
Gross Unrealized Losses - 12 Months or Longer | 0 |
Total Gross Unrealized Losses | $ (67) |
Held-to-maturity, Qty, Less Than 12 Months | security | 1 |
Held-to-maturity, Qty, 12 Months or Longer | security | 0 |
Bank issued trust preferred securities |  |
Held-to-maturity Securities, Fair Value: |  |
Estimated Fair Value - Less Than 12 Months | $ 469 |
Estimated Fair Value - 12 Months or Longer | 0 |
Total Estimated Fair Value | 469 |
Held-to-maturity Securities, Gross Unrealized Losses |  |
Gross Unrealized Losses - Less Than 12 Months | (31) |
Gross Unrealized Losses - 12 Months or Longer | 0 |
Total Gross Unrealized Losses | $ (31) |
Held-to-maturity, Qty, Less Than 12 Months | security | 1 |
Held-to-maturity, Qty, 12 Months or Longer | security | 0 |

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