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Investment Securities: Unrealized Gain (Loss) on Investments (Details)
$ in Thousands
Dec. 31, 2024
USD ($)
security
Sep. 30, 2024
USD ($)
security
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 31,263 $ 805
Held to maturity, 12 Months or Longer, Estimated Fair Value 111,304 127,905
Held to maturity, Total, Estimated Fair Value 142,567 128,710
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (258) (6)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (8,411) (6,567)
Held to maturity, Total, Gross Unrealized Losses $ (8,669) $ (6,573)
Held to maturity, Less Than 12 Months, Quantity | security 20 2,000
Held to maturity, 12 Months or Longer, Quantity | security 78 81,000
Available-for-sale Securities, Fair Value:    
Available for sale, Less Than 12 Months, Estimated Fair Value $ 29,584 $ 13,330
Available for sale, 12 Months or Longer, Estimated Fair Value 24,959 25,751
Available for sale, Total, Estimated Fair Value 54,543 39,081
Available-for-sale Securities, Gross Unrealized Losses:    
Available for sale, Less Than 12 Months, Gross Unrealized Losses (547) (118)
Available for sale, 12 Months or Longer, Gross Unrealized Losses (510) (407)
Available for sale, Total, Gross Unrealized Losses $ (1,057) $ (525)
Available-for-sale, Less than 12 Months, Quantity | security 12 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 $ 9,786 $ 0
Held to maturity, 12 Months or Longer, Estimated Fair Value 64,689 78,363
Held to maturity, Total, Estimated Fair Value 74,475 78,363
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (9) 0
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (4,907) (4,197)
Held to maturity, Total, Gross Unrealized Losses $ (4,916) $ (4,197)
Held to maturity, Less Than 12 Months, Quantity | security 1 0
Held to maturity, 12 Months or Longer, Quantity | security 15 17,000
Available-for-sale Securities, Fair Value:    
Available for sale, Less Than 12 Months, Estimated Fair Value $ 7,557  
Available for sale, Total, Estimated Fair Value 7,557  
Available-for-sale Securities, Gross Unrealized Losses:    
Available for sale, Less Than 12 Months, Gross Unrealized Losses (25)  
Available for sale, 12 Months or Longer, Gross Unrealized Losses 0  
Available for sale, Total, Gross Unrealized Losses $ (25)  
Available-for-sale, Less than 12 Months, Quantity | security 5  
U.S. government agencies    
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 18,746 $ 1
Held to maturity, 12 Months or Longer, Estimated Fair Value 26,938 28,618
Held to maturity, Total, Estimated Fair Value 45,684 28,619
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (237) 0
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (2,087) (1,378)
Held to maturity, Total, Gross Unrealized Losses $ (2,324) $ (1,378)
Held to maturity, Less Than 12 Months, Quantity | security 15 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 $ 22,027 $ 11,368
Available for sale, 12 Months or Longer, Estimated Fair Value 24,959 25,751
Available for sale, Total, Estimated Fair Value 46,986 37,119
Available-for-sale Securities, Gross Unrealized Losses:    
Available for sale, Less Than 12 Months, Gross Unrealized Losses (522) (117)
Available for sale, 12 Months or Longer, Gross Unrealized Losses (510) (407)
Available for sale, Total, Gross Unrealized Losses $ (1,032) $ (524)
Available-for-sale, Less than 12 Months, Quantity | security 7 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 $ 2,731 $ 804
Held to maturity, 12 Months or Longer, Estimated Fair Value 19,187 20,447
Held to maturity, Total, Estimated Fair Value 21,918 21,251
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (12) (6)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (1,410) (974)
Held to maturity, Total, Gross Unrealized Losses $ (1,422) $ (980)
Held to maturity, Less Than 12 Months, Quantity | security 4 1,000
Held to maturity, 12 Months or Longer, Quantity | security 19 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 490 477
Held to maturity, Total, Estimated Fair Value 490 477
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 (7) (18)
Held to maturity, Total, Gross Unrealized Losses $ (7) $ (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