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Investment Securities: Unrealized Gain (Loss) on Investments (Details) $ in Thousands | Dec. 31, 2023 USD ($) security | Sep. 30, 2023 USD ($) security
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Held-to-maturity Securities, Fair Value: |  |
Held to maturity, Less Than 12 Months, Estimated Fair Value | $ 28,056 | $ 27,175
Held to maturity, 12 Months or Longer, Estimated Fair Value | 222,544 | 224,179
Held to maturity, Total, Estimated Fair Value | 250,600 | 251,354
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | (148) | (680)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | (11,935) | (16,067)
Held to maturity, Total, Gross Unrealized Losses | $ (12,083) | $ (16,747)
Held to maturity, Less Than 12 Months, Quantity | security | 10 | 15,000
Held to maturity, 12 Months or Longer, Quantity | security | 109 | 111,000
U.S. Treasury and U.S. government agency securities |  |
Held-to-maturity Securities, Fair Value: |  |
Held to maturity, Less Than 12 Months, Estimated Fair Value | $ 9,614 | $ 9,455
Held to maturity, 12 Months or Longer, Estimated Fair Value | 152,786 | 152,082
Held to maturity, Total, Estimated Fair Value | 162,400 | 161,537
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | (12) | (129)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | (7,456) | (9,959)
Held to maturity, Total, Gross Unrealized Losses | $ (7,468) | $ (10,088)
Held to maturity, Less Than 12 Months, Quantity | security | 1 | 1,000
Held to maturity, 12 Months or Longer, Quantity | security | 25 | 26,000
U.S. government agencies |  |
Held-to-maturity Securities, Fair Value: |  |
Held to maturity, Less Than 12 Months, Estimated Fair Value | $ 18,442 | $ 16,432
Held to maturity, 12 Months or Longer, Estimated Fair Value | 31,972 | 31,703
Held to maturity, Total, Estimated Fair Value | 50,414 | 48,135
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | (136) | (549)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | (2,468) | (3,401)
Held to maturity, Total, Gross Unrealized Losses | $ (2,604) | $ (3,950)
Held to maturity, Less Than 12 Months, Quantity | security | 9 | 13,000
Held to maturity, 12 Months or Longer, Quantity | security | 52 | 51,000
Available-for-sale Securities, Fair Value: |  |
Available for sale, Less Than 12 Months, Estimated Fair Value | $ 11,953 | $ 10,635
Available for sale, 12 Months or Longer, Estimated Fair Value | 28,179 | 30,809
Available for sale, Total, Estimated Fair Value | 40,132 | 41,444
Available-for-sale Securities, Gross Unrealized Losses: |  |
Available for sale, Less Than 12 Months, Gross Unrealized Losses | (134) | (308)
Available for sale, 12 Months or Longer, Gross Unrealized Losses | (912) | (1,053)
Available for sale, Total, Gross Unrealized Losses | $ (1,046) | $ (1,361)
Available-for-sale, Less than 12 Months, Quantity | security | 4 | 3,000
Available-for-sale, 12 Months or Longer, Quantity | security | 26 | 27,000
Private label residential |  |
Held-to-maturity Securities, Fair Value: |  |
Held to maturity, Less Than 12 Months, Estimated Fair Value | $ 0 | $ 1,288
Held to maturity, 12 Months or Longer, Estimated Fair Value | 35,585 | 38,205
Held to maturity, Total, Estimated Fair Value | 35,585 | 39,493
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | 0 | (2)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | (1,934) | (2,609)
Held to maturity, Total, Gross Unrealized Losses | $ (1,934) | $ (2,611)
Held to maturity, Less Than 12 Months, Quantity | security | 0 | 1,000
Held to maturity, 12 Months or Longer, Quantity | security | 30 | 32,000
Municipal securities |  |
Held-to-maturity Securities, Fair Value: |  |
Held to maturity, Less Than 12 Months, Estimated Fair Value | $ 0 | $ 0
Held to maturity, 12 Months or Longer, Estimated Fair Value | 1,748 | 1,740
Held to maturity, Total, Estimated Fair Value | 1,748 | 1,740
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | 0 | 0
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | (30) | (47)
Held to maturity, Total, Gross Unrealized Losses | $ (30) | $ (47)
Held to maturity, Less Than 12 Months, Quantity | security | 0 | 0
Held to maturity, 12 Months or Longer, Quantity | security | 1 | 1,000
Bank issued trust preferred securities |  |
Held-to-maturity Securities, Fair Value: |  |
Held to maturity, Less Than 12 Months, Estimated Fair Value | $ 0 | $ 0
Held to maturity, 12 Months or Longer, Estimated Fair Value | 453 | 449
Held to maturity, Total, Estimated Fair Value | 453 | 449
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | 0 | 0
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | (47) | (51)
Held to maturity, Total, Gross Unrealized Losses | $ (47) | $ (51)
Held to maturity, Less Than 12 Months, Quantity | security | 0 | 0
Held to maturity, 12 Months or Longer, Quantity | security | 1 | 1,000

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