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Investment Securities: Unrealized Gain (Loss) on Investments (Details) $ in Thousands | Jun. 30, 2024 USD ($) security | Sep. 30, 2023 USD ($) security
--- | --- | ---
Held-to-maturity Securities, Fair Value: |  |
Held to maturity, Less Than 12 Months, Estimated Fair Value | $ 10,633 | $ 27,175
Held to maturity, 12 Months or Longer, Estimated Fair Value | 151,528 | 224,179
Held to maturity, Total, Estimated Fair Value | 162,161 | 251,354
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | (88) | (680)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | (10,178) | (16,067)
Held to maturity, Total, Gross Unrealized Losses | $ (10,266) | $ (16,747)
Held to maturity, Less Than 12 Months, Quantity | security | 8 | 15,000
Held to maturity, 12 Months or Longer, Quantity | security | 94 | 111,000
Available-for-sale Securities, Fair Value: |  |
Available for sale, Less Than 12 Months, Estimated Fair Value | $ 19,928 | $ 10,635
Available for sale, 12 Months or Longer, Estimated Fair Value | 33,578 | 30,809
Available for sale, Total, Estimated Fair Value | 53,506 | 41,444
Available-for-sale Securities, Gross Unrealized Losses: |  |
Available for sale, Less Than 12 Months, Gross Unrealized Losses | (47) | (308)
Available for sale, 12 Months or Longer, Gross Unrealized Losses | (779) | (1,053)
Available for sale, Total, Gross Unrealized Losses | $ (826) | $ (1,361)
Available-for-sale, Less than 12 Months, Quantity | security | 6 | 3,000
Available-for-sale, 12 Months or Longer, Quantity | security | 28 | 27,000
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 | $ 0 | $ 9,455
Held to maturity, 12 Months or Longer, Estimated Fair Value | 85,884 | 152,082
Held to maturity, Total, Estimated Fair Value | 85,884 | 161,537
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | 0 | (129)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | (6,349) | (9,959)
Held to maturity, Total, Gross Unrealized Losses | $ (6,349) | $ (10,088)
Held to maturity, Less Than 12 Months, Quantity | security | 0 | 1,000
Held to maturity, 12 Months or Longer, Quantity | security | 18 | 26,000
Available-for-sale Securities, Fair Value: |  |
Available for sale, Less Than 12 Months, Estimated Fair Value | $ 8,910 |
Available for sale, Total, Estimated Fair Value | 8,910 |
Available-for-sale Securities, Gross Unrealized Losses: |  |
Available for sale, Less Than 12 Months, Gross Unrealized Losses | (14) |
Available for sale, 12 Months or Longer, Gross Unrealized Losses | 0 |
Available for sale, Total, Gross Unrealized Losses | $ (14) |
Available-for-sale, Less than 12 Months, Quantity | security | 3 |
U.S. government agencies |  |
Held-to-maturity Securities, Fair Value: |  |
Held to maturity, Less Than 12 Months, Estimated Fair Value | $ 10,633 | $ 16,432
Held to maturity, 12 Months or Longer, Estimated Fair Value | 37,477 | 31,703
Held to maturity, Total, Estimated Fair Value | 48,110 | 48,135
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | (88) | (549)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | (2,352) | (3,401)
Held to maturity, Total, Gross Unrealized Losses | $ (2,440) | $ (3,950)
Held to maturity, Less Than 12 Months, Quantity | security | 8 | 13,000
Held to maturity, 12 Months or Longer, Quantity | security | 49 | 51,000
Available-for-sale Securities, Fair Value: |  |
Available for sale, Less Than 12 Months, Estimated Fair Value | $ 11,018 | $ 10,635
Available for sale, 12 Months or Longer, Estimated Fair Value | 33,578 | 30,809
Available for sale, Total, Estimated Fair Value | 44,596 | 41,444
Available-for-sale Securities, Gross Unrealized Losses: |  |
Available for sale, Less Than 12 Months, Gross Unrealized Losses | (33) | (308)
Available for sale, 12 Months or Longer, Gross Unrealized Losses | (779) | (1,053)
Available for sale, Total, Gross Unrealized Losses | $ (812) | $ (1,361)
Available-for-sale, Less than 12 Months, Quantity | security | 3 | 3,000
Available-for-sale, 12 Months or Longer, Quantity | security | 28 | 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 | 26,476 | 38,205
Held to maturity, Total, Estimated Fair Value | 26,476 | 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 | (1,438) | (2,609)
Held to maturity, Total, Gross Unrealized Losses | $ (1,438) | $ (2,611)
Held to maturity, Less Than 12 Months, Quantity | security | 0 | 1,000
Held to maturity, 12 Months or Longer, Quantity | security | 25 | 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 | 1,226 | 1,740
Held to maturity, Total, Estimated Fair Value | 1,226 | 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 | (10) | (47)
Held to maturity, Total, Gross Unrealized Losses | $ (10) | $ (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 | 465 | 449
Held to maturity, Total, Estimated Fair Value | 465 | 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 | (29) | (51)
Held to maturity, Total, Gross Unrealized Losses | $ (29) | $ (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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