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Investment Securities: Unrealized Gain (Loss) on Investments (Details) $ in Thousands | Dec. 31, 2022 USD ($) security | Sep. 30, 2022 USD ($) security
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Held-to-maturity Securities, Fair Value: |  |
Held to maturity, Less Than 12 Months, Estimated Fair Value | $ 132,581 | $ 189,351
Held to maturity, 12 Months or Longer, Estimated Fair Value | 101,918 | 47,652
Held to maturity, Total, Estimated Fair Value | 234,499 | 237,003
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | (4,828) | (10,937)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | (10,374) | (6,148)
Held to maturity, Total, Gross Unrealized Losses | $ (15,202) | $ (17,085)
Held to maturity, Less Than 12 Months, Quantity | security | 84 | 100,000
Held to maturity, 12 Months or Longer, Quantity | security | 38 | 20,000
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 | $ 71,681 | $ 115,504
Held to maturity, 12 Months or Longer, Estimated Fair Value | 79,151 | 33,638
Held to maturity, Total, Estimated Fair Value | 150,832 | 149,142
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | (2,552) | (7,224)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | (8,064) | (4,885)
Held to maturity, Total, Gross Unrealized Losses | $ (10,616) | $ (12,109)
Held to maturity, Less Than 12 Months, Quantity | security | 7 | 17,000
Held to maturity, 12 Months or Longer, Quantity | security | 19 | 9,000
U.S. government agencies |  |
Held-to-maturity Securities, Fair Value: |  |
Held to maturity, Less Than 12 Months, Estimated Fair Value | $ 30,377 | $ 35,896
Held to maturity, 12 Months or Longer, Estimated Fair Value | 5,400 | 5,306
Held to maturity, Total, Estimated Fair Value | 35,777 | 41,202
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | (1,175) | (1,449)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | (1,065) | (1,037)
Held to maturity, Total, Gross Unrealized Losses | $ (2,240) | $ (2,486)
Held to maturity, Less Than 12 Months, Quantity | security | 52 | 54,000
Held to maturity, 12 Months or Longer, Quantity | security | 7 | 5,000
Available-for-sale Securities, Fair Value: |  |
Available for sale, Less Than 12 Months, Estimated Fair Value | $ 22,696 | $ 25,170
Available for sale, 12 Months or Longer, Estimated Fair Value | 15,248 | 15,705
Available for sale, Total, Estimated Fair Value | 37,944 | 40,875
Available-for-sale Securities, Gross Unrealized Losses: |  |
Available for sale, Less Than 12 Months, Gross Unrealized Losses | (630) | (292)
Available for sale, 12 Months or Longer, Gross Unrealized Losses | (733) | (602)
Available for sale, Total, Gross Unrealized Losses | $ (1,363) | $ (894)
Available-for-sale, Less than 12 Months, Quantity | security | 15 | 16,000
Available-for-sale, 12 Months or Longer, Quantity | security | 13 | 13,000
Private label residential |  |
Held-to-maturity Securities, Fair Value: |  |
Held to maturity, Less Than 12 Months, Estimated Fair Value | $ 28,489 | $ 35,447
Held to maturity, 12 Months or Longer, Estimated Fair Value | 16,897 | 8,708
Held to maturity, Total, Estimated Fair Value | 45,386 | 44,155
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | (1,043) | (2,166)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | (1,215) | (226)
Held to maturity, Total, Gross Unrealized Losses | $ (2,258) | $ (2,392)
Held to maturity, Less Than 12 Months, Quantity | security | 24 | 27,000
Held to maturity, 12 Months or Longer, Quantity | security | 11 | 6,000
Taxable municipal securities |  |
Held-to-maturity Securities, Fair Value: |  |
Held to maturity, Less Than 12 Months, Estimated Fair Value | $ 2,034 | $ 2,035
Held to maturity, 12 Months or Longer, Estimated Fair Value | 0 | 0
Held to maturity, Total, Estimated Fair Value | 2,034 | 2,035
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | (58) | (67)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | 0 | 0
Held to maturity, Total, Gross Unrealized Losses | $ (58) | $ (67)
Held to maturity, Less Than 12 Months, Quantity | security | 1 | 1,000
Held to maturity, 12 Months or Longer, Quantity | security | 0 | 0
Bank issued trust preferred securities |  |
Held-to-maturity Securities, Fair Value: |  |
Held to maturity, Less Than 12 Months, Estimated Fair Value | $ 0 | $ 469
Held to maturity, 12 Months or Longer, Estimated Fair Value | 470 | 0
Held to maturity, Total, Estimated Fair Value | 470 | 469
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | 0 | (31)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | (30) | 0
Held to maturity, Total, Gross Unrealized Losses | $ (30) | $ (31)
Held to maturity, Less Than 12 Months, Quantity | security | 0 | 1,000
Held to maturity, 12 Months or Longer, Quantity | security | 1 | 0

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