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Investment Securities: Unrealized Gain (Loss) on Investments (Details)
$ in Thousands
Mar. 31, 2025
USD ($)
security
Sep. 30, 2024
USD ($)
security
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 13,564 $ 805
Held to maturity, 12 Months or Longer, Estimated Fair Value 98,560 127,905
Held to maturity, Total, Estimated Fair Value 112,124 128,710
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (65) (6)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (6,795) (6,567)
Held to maturity, Total, Gross Unrealized Losses $ (6,860) $ (6,573)
Held to maturity, Less Than 12 Months, Quantity | security 14 2,000
Held to maturity, 12 Months or Longer, Quantity | security 74 81,000
Available-for-sale Securities, Fair Value:    
Available for sale, Less Than 12 Months, Estimated Fair Value $ 21,859 $ 13,330
Available for sale, 12 Months or Longer, Estimated Fair Value 24,057 25,751
Available for sale, Total, Estimated Fair Value 45,916 39,081
Available-for-sale Securities, Gross Unrealized Losses:    
Available for sale, Less Than 12 Months, Gross Unrealized Losses (436) (118)
Available for sale, 12 Months or Longer, Gross Unrealized Losses (622) (407)
Available for sale, Total, Gross Unrealized Losses $ (1,058) $ (525)
Available-for-sale, Less than 12 Months, Quantity | security 7 5,000
Available-for-sale, 12 Months or Longer, Quantity | security 22 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 55,684 78,363
Held to maturity, Total, Estimated Fair Value 55,684 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 (3,953) (4,197)
Held to maturity, Total, Gross Unrealized Losses $ (3,953) $ (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 $ 4,899  
Available for sale, Total, Estimated Fair Value 4,899  
Available-for-sale Securities, Gross Unrealized Losses:    
Available for sale, Less Than 12 Months, Gross Unrealized Losses (9)  
Available for sale, 12 Months or Longer, Gross Unrealized Losses 0  
Available for sale, Total, Gross Unrealized Losses $ (9)  
Available-for-sale, Less than 12 Months, Quantity | security 2  
U.S. government agencies    
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 12,043 $ 1
Held to maturity, 12 Months or Longer, Estimated Fair Value 26,509 28,618
Held to maturity, Total, Estimated Fair Value 38,552 28,619
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (57) 0
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (1,719) (1,378)
Held to maturity, Total, Gross Unrealized Losses $ (1,776) $ (1,378)
Held to maturity, Less Than 12 Months, Quantity | security 11 1,000
Held to maturity, 12 Months or Longer, Quantity | security 43 44,000
Available-for-sale Securities, Fair Value:    
Available for sale, Less Than 12 Months, Estimated Fair Value $ 16,960 $ 11,368
Available for sale, 12 Months or Longer, Estimated Fair Value 24,057 25,751
Available for sale, Total, Estimated Fair Value 41,017 37,119
Available-for-sale Securities, Gross Unrealized Losses:    
Available for sale, Less Than 12 Months, Gross Unrealized Losses (427) (117)
Available for sale, 12 Months or Longer, Gross Unrealized Losses (622) (407)
Available for sale, Total, Gross Unrealized Losses $ (1,049) $ (524)
Available-for-sale, Less than 12 Months, Quantity | security 5 4,000
Available-for-sale, 12 Months or Longer, Quantity | security 22 23,000
Private label residential    
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 1,521 $ 804
Held to maturity, 12 Months or Longer, Estimated Fair Value 15,872 20,447
Held to maturity, Total, Estimated Fair Value 17,393 21,251
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (8) (6)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (1,120) (974)
Held to maturity, Total, Gross Unrealized Losses $ (1,128) $ (980)
Held to maturity, Less Than 12 Months, Quantity | security 3 1,000
Held to maturity, 12 Months or Longer, Quantity | security 16 19,000
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 495 477
Held to maturity, Total, Estimated Fair Value 495 477
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) (18)
Held to maturity, Total, Gross Unrealized Losses $ (3) $ (18)
Held to maturity, Less Than 12 Months, Quantity | security 0 0
Held to maturity, 12 Months or Longer, Quantity | security 1 1,000
US Government Agencies Debt Securities    
Available-for-sale Securities, Fair Value:    
Available for sale, Less Than 12 Months, Estimated Fair Value   $ 1,962
Available for sale, 12 Months or Longer, Estimated Fair Value $ 0 0
Available for sale, Total, Estimated Fair Value   1,962
Available-for-sale Securities, Gross Unrealized Losses:    
Available for sale, Less Than 12 Months, Gross Unrealized Losses   (1)
Available for sale, 12 Months or Longer, Gross Unrealized Losses   0
Available for sale, Total, Gross Unrealized Losses   $ (1)
Available-for-sale, Less than 12 Months, Quantity | security   1,000
Available-for-sale, 12 Months or Longer, Quantity | security 0 0