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Investment Securities: Unrealized Gain (Loss) on Investments (Details)
$ in Thousands
Mar. 31, 2024
USD ($)
security
Sep. 30, 2023
USD ($)
security
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 25,295 $ 27,175
Held to maturity, 12 Months or Longer, Estimated Fair Value 171,788 224,179
Held to maturity, Total, Estimated Fair Value 197,083 251,354
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (209) (680)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (11,133) (16,067)
Held to maturity, Total, Gross Unrealized Losses $ (11,342) $ (16,747)
Held to maturity, Less Than 12 Months, Quantity | security 4 15,000
Held to maturity, 12 Months or Longer, Quantity | security 106 111,000
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 $ 9,609 $ 9,455
Held to maturity, 12 Months or Longer, Estimated Fair Value 105,526 152,082
Held to maturity, Total, Estimated Fair Value 115,135 161,537
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (59) (129)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (6,893) (9,959)
Held to maturity, Total, Gross Unrealized Losses $ (6,952) $ (10,088)
Held to maturity, Less Than 12 Months, Quantity | security 1 1,000
Held to maturity, 12 Months or Longer, Quantity | security 20 26,000
U.S. government agencies    
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 15,686 $ 16,432
Held to maturity, 12 Months or Longer, Estimated Fair Value 33,660 31,703
Held to maturity, Total, Estimated Fair Value 49,346 48,135
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (150) (549)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (2,526) (3,401)
Held to maturity, Total, Gross Unrealized Losses $ (2,676) $ (3,950)
Held to maturity, Less Than 12 Months, Quantity | security 3 13,000
Held to maturity, 12 Months or Longer, Quantity | security 55 51,000
Available-for-sale Securities, Fair Value:    
Available for sale, Less Than 12 Months, Estimated Fair Value $ 25,293 $ 10,635
Available for sale, 12 Months or Longer, Estimated Fair Value 27,561 30,809
Available for sale, Total, Estimated Fair Value 52,854 41,444
Available-for-sale Securities, Gross Unrealized Losses:    
Available for sale, Less Than 12 Months, Gross Unrealized Losses (166) (308)
Available for sale, 12 Months or Longer, Gross Unrealized Losses (811) (1,053)
Available for sale, Total, Gross Unrealized Losses $ (977) $ (1,361)
Available-for-sale, Less than 12 Months, Quantity | security 3 3,000
Available-for-sale, 12 Months or Longer, Quantity | security 31 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 30,398 38,205
Held to maturity, Total, Estimated Fair Value 30,398 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 (1,658) (2,609)
Held to maturity, Total, Gross Unrealized Losses $ (1,658) $ (2,611)
Held to maturity, Less Than 12 Months, Quantity | security 0 1,000
Held to maturity, 12 Months or Longer, Quantity | security 29 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 1,744 1,740
Held to maturity, Total, Estimated Fair Value 1,744 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 (24) (47)
Held to maturity, Total, Gross Unrealized Losses $ (24) $ (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 460 449
Held to maturity, Total, Estimated Fair Value 460 449
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 (32) (51)
Held to maturity, Total, Gross Unrealized Losses $ (32) $ (51)
Held to maturity, Less Than 12 Months, Quantity | security 0 0
Held to maturity, 12 Months or Longer, Quantity | security 1 1,000