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Investment Securities: Unrealized Gain (Loss) on Investments (Details)
$ in Thousands
Jun. 30, 2023
USD ($)
security
Sep. 30, 2022
USD ($)
security
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 55,630 $ 189,351
Held to maturity, 12 Months or Longer, Estimated Fair Value 196,459 47,652
Held to maturity, Total, Estimated Fair Value 252,089 237,003
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (946) (10,937)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (13,904) (6,148)
Held to maturity, Total, Gross Unrealized Losses $ (14,850) $ (17,085)
Held to maturity, Less Than 12 Months, Quantity | security 27 100,000
Held to maturity, 12 Months or Longer, Quantity | security 96 20,000
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 $ 19,045 $ 115,504
Held to maturity, 12 Months or Longer, Estimated Fair Value 142,413 33,638
Held to maturity, Total, Estimated Fair Value 161,458 149,142
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (207) (7,224)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (9,720) (4,885)
Held to maturity, Total, Gross Unrealized Losses $ (9,927) $ (12,109)
Held to maturity, Less Than 12 Months, Quantity | security 2 17,000
Held to maturity, 12 Months or Longer, Quantity | security 25 9,000
U.S. government agencies    
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 26,124 $ 35,896
Held to maturity, 12 Months or Longer, Estimated Fair Value 19,498 5,306
Held to maturity, Total, Estimated Fair Value 45,622 41,202
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (474) (1,449)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (2,055) (1,037)
Held to maturity, Total, Gross Unrealized Losses $ (2,529) $ (2,486)
Held to maturity, Less Than 12 Months, Quantity | security 18 54,000
Held to maturity, 12 Months or Longer, Quantity | security 42 5,000
Available-for-sale Securities, Fair Value:    
Available for sale, Less Than 12 Months, Estimated Fair Value $ 22,328 $ 25,170
Available for sale, 12 Months or Longer, Estimated Fair Value 21,213 15,705
Available for sale, Total, Estimated Fair Value 43,541 40,875
Available-for-sale Securities, Gross Unrealized Losses:    
Available for sale, Less Than 12 Months, Gross Unrealized Losses (188) (292)
Available for sale, 12 Months or Longer, Gross Unrealized Losses (742) (602)
Available for sale, Total, Gross Unrealized Losses $ (930) $ (894)
Available-for-sale, Less than 12 Months, Quantity | security 10 16,000
Available-for-sale, 12 Months or Longer, Quantity | security 21 13,000
Private label residential    
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 10,461 $ 35,447
Held to maturity, 12 Months or Longer, Estimated Fair Value 32,351 8,708
Held to maturity, Total, Estimated Fair Value 42,812 44,155
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (265) (2,166)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (2,030) (226)
Held to maturity, Total, Gross Unrealized Losses $ (2,295) $ (2,392)
Held to maturity, Less Than 12 Months, Quantity | security 7 27,000
Held to maturity, 12 Months or Longer, Quantity | security 27 6,000
Taxable municipal securities    
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 0 $ 2,035
Held to maturity, 12 Months or Longer, Estimated Fair Value 1,749 0
Held to maturity, Total, Estimated Fair Value 1,749 2,035
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses 0 (67)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (47) 0
Held to maturity, Total, Gross Unrealized Losses $ (47) $ (67)
Held to maturity, Less Than 12 Months, Quantity | security 0 1,000
Held to maturity, 12 Months or Longer, Quantity | security 1 0
Bank issued trust preferred securities    
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 0 $ 469
Held to maturity, 12 Months or Longer, Estimated Fair Value 448 0
Held to maturity, Total, Estimated Fair Value 448 469
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses 0 (31)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (52) 0
Held to maturity, Total, Gross Unrealized Losses $ (52) $ (31)
Held to maturity, Less Than 12 Months, Quantity | security 0 1,000
Held to maturity, 12 Months or Longer, Quantity | security 1 0