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Investment Securities: Unrealized Gain (Loss) on Investments (Details)
$ in Thousands
Jun. 30, 2025
USD ($)
security
Sep. 30, 2024
USD ($)
security
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 15,763 $ 805
Held to maturity, 12 Months or Longer, Estimated Fair Value 96,518 127,905
Held to maturity, Total, Estimated Fair Value 112,281 128,710
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (77) (6)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (6,092) (6,567)
Held to maturity, Total, Gross Unrealized Losses $ (6,169) $ (6,573)
Held to maturity, Less Than 12 Months, Quantity | security 14 2,000
Held to maturity, 12 Months or Longer, Quantity | security 68 81,000
Available-for-sale Securities, Fair Value:    
Available for sale, Less Than 12 Months, Estimated Fair Value $ 37,854 $ 13,330
Available for sale, 12 Months or Longer, Estimated Fair Value 24,861 25,751
Available for sale, Total, Estimated Fair Value 62,715 39,081
Available-for-sale Securities, Gross Unrealized Losses:    
Available for sale, Less Than 12 Months, Gross Unrealized Losses (506) (118)
Available for sale, 12 Months or Longer, Gross Unrealized Losses (680) (407)
Available for sale, Total, Gross Unrealized Losses $ (1,186) $ (525)
Available-for-sale, Less than 12 Months, Quantity | security 9 5,000
Available-for-sale, 12 Months or Longer, Quantity | security 23 23,000
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 $ 0
Held to maturity, 12 Months or Longer, Estimated Fair Value 56,200 78,363
Held to maturity, Total, Estimated Fair Value 56,200 78,363
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 (3,478) (4,197)
Held to maturity, Total, Gross Unrealized Losses $ (3,478) $ (4,197)
Held to maturity, Less Than 12 Months, Quantity | security 0 0
Held to maturity, 12 Months or Longer, Quantity | security 14 17,000
Available-for-sale Securities, Fair Value:    
Available for sale, Less Than 12 Months, Estimated Fair Value $ 14,866 $ 1,962
Available for sale, 12 Months or Longer, Estimated Fair Value 0 0
Available for sale, Total, Estimated Fair Value 14,866 1,962
Available-for-sale Securities, Gross Unrealized Losses:    
Available for sale, Less Than 12 Months, Gross Unrealized Losses (22) (1)
Available for sale, 12 Months or Longer, Gross Unrealized Losses 0 0
Available for sale, Total, Gross Unrealized Losses $ (22) $ (1)
Available-for-sale, Less than 12 Months, Quantity | security 3 1,000
Available-for-sale, 12 Months or Longer, Quantity | security 0 0
U.S. government agencies    
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 14,460 $ 1
Held to maturity, 12 Months or Longer, Estimated Fair Value 25,307 28,618
Held to maturity, Total, Estimated Fair Value 39,767 28,619
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (72) 0
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (1,610) (1,378)
Held to maturity, Total, Gross Unrealized Losses $ (1,682) $ (1,378)
Held to maturity, Less Than 12 Months, Quantity | security 11 1,000
Held to maturity, 12 Months or Longer, Quantity | security 40 44,000
Available-for-sale Securities, Fair Value:    
Available for sale, Less Than 12 Months, Estimated Fair Value $ 22,988 $ 11,368
Available for sale, 12 Months or Longer, Estimated Fair Value 24,861 25,751
Available for sale, Total, Estimated Fair Value 47,849 37,119
Available-for-sale Securities, Gross Unrealized Losses:    
Available for sale, Less Than 12 Months, Gross Unrealized Losses (484) (117)
Available for sale, 12 Months or Longer, Gross Unrealized Losses (680) (407)
Available for sale, Total, Gross Unrealized Losses $ (1,164) $ (524)
Available-for-sale, Less than 12 Months, Quantity | security 6 4,000
Available-for-sale, 12 Months or Longer, Quantity | security 23 23,000
Private label residential    
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 1,303 $ 804
Held to maturity, 12 Months or Longer, Estimated Fair Value 15,011 20,447
Held to maturity, Total, Estimated Fair Value 16,314 21,251
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (5) (6)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (1,004) (974)
Held to maturity, Total, Gross Unrealized Losses $ (1,009) $ (980)
Held to maturity, Less Than 12 Months, Quantity | security 3 1,000
Held to maturity, 12 Months or Longer, Quantity | security 14 19,000
Bank issued trust preferred securities    
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value   $ 0
Held to maturity, 12 Months or Longer, Estimated Fair Value   477
Held to maturity, Total, Estimated Fair Value   477
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses   0
Held to maturity, 12 Months or Longer, Gross Unrealized Losses   (18)
Held to maturity, Total, Gross Unrealized Losses   $ (18)
Held to maturity, Less Than 12 Months, Quantity | security   0
Held to maturity, 12 Months or Longer, Quantity | security   1,000