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Investment Securities: Unrealized Gain (Loss) on Investments (Details)
$ in Thousands
Dec. 31, 2023
USD ($)
security
Sep. 30, 2023
USD ($)
security
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 28,056 $ 27,175
Held to maturity, 12 Months or Longer, Estimated Fair Value 222,544 224,179
Held to maturity, Total, Estimated Fair Value 250,600 251,354
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (148) (680)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (11,935) (16,067)
Held to maturity, Total, Gross Unrealized Losses $ (12,083) $ (16,747)
Held to maturity, Less Than 12 Months, Quantity | security 10 15,000
Held to maturity, 12 Months or Longer, Quantity | security 109 111,000
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 $ 9,614 $ 9,455
Held to maturity, 12 Months or Longer, Estimated Fair Value 152,786 152,082
Held to maturity, Total, Estimated Fair Value 162,400 161,537
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (12) (129)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (7,456) (9,959)
Held to maturity, Total, Gross Unrealized Losses $ (7,468) $ (10,088)
Held to maturity, Less Than 12 Months, Quantity | security 1 1,000
Held to maturity, 12 Months or Longer, Quantity | security 25 26,000
U.S. government agencies    
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 18,442 $ 16,432
Held to maturity, 12 Months or Longer, Estimated Fair Value 31,972 31,703
Held to maturity, Total, Estimated Fair Value 50,414 48,135
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (136) (549)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (2,468) (3,401)
Held to maturity, Total, Gross Unrealized Losses $ (2,604) $ (3,950)
Held to maturity, Less Than 12 Months, Quantity | security 9 13,000
Held to maturity, 12 Months or Longer, Quantity | security 52 51,000
Available-for-sale Securities, Fair Value:    
Available for sale, Less Than 12 Months, Estimated Fair Value $ 11,953 $ 10,635
Available for sale, 12 Months or Longer, Estimated Fair Value 28,179 30,809
Available for sale, Total, Estimated Fair Value 40,132 41,444
Available-for-sale Securities, Gross Unrealized Losses:    
Available for sale, Less Than 12 Months, Gross Unrealized Losses (134) (308)
Available for sale, 12 Months or Longer, Gross Unrealized Losses (912) (1,053)
Available for sale, Total, Gross Unrealized Losses $ (1,046) $ (1,361)
Available-for-sale, Less than 12 Months, Quantity | security 4 3,000
Available-for-sale, 12 Months or Longer, Quantity | security 26 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 35,585 38,205
Held to maturity, Total, Estimated Fair Value 35,585 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 (1,934) (2,609)
Held to maturity, Total, Gross Unrealized Losses $ (1,934) $ (2,611)
Held to maturity, Less Than 12 Months, Quantity | security 0 1,000
Held to maturity, 12 Months or Longer, Quantity | security 30 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 1,748 1,740
Held to maturity, Total, Estimated Fair Value 1,748 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 (30) (47)
Held to maturity, Total, Gross Unrealized Losses $ (30) $ (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 453 449
Held to maturity, Total, Estimated Fair Value 453 449
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 (47) (51)
Held to maturity, Total, Gross Unrealized Losses $ (47) $ (51)
Held to maturity, Less Than 12 Months, Quantity | security 0 0
Held to maturity, 12 Months or Longer, Quantity | security 1 1,000