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Investment Securities: Unrealized Gain (Loss) on Investments (Details)
$ in Thousands
Mar. 31, 2023
USD ($)
security
Sep. 30, 2022
USD ($)
security
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 55,617 $ 189,351
Held to maturity, 12 Months or Longer, Estimated Fair Value 178,634 47,652
Held to maturity, Total, Estimated Fair Value 234,251 237,003
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (1,351) (10,937)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (12,080) (6,148)
Held to maturity, Total, Gross Unrealized Losses $ (13,431) $ (17,085)
Held to maturity, Less Than 12 Months, Quantity | security 41 100,000
Held to maturity, 12 Months or Longer, Quantity | security 73 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 $ 9,507 $ 115,504
Held to maturity, 12 Months or Longer, Estimated Fair Value 142,892 33,638
Held to maturity, Total, Estimated Fair Value 152,399 149,142
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (127) (7,224)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (9,117) (4,885)
Held to maturity, Total, Gross Unrealized Losses $ (9,244) $ (12,109)
Held to maturity, Less Than 12 Months, Quantity | security 1 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 $ 22,367 $ 35,896
Held to maturity, 12 Months or Longer, Estimated Fair Value 12,627 5,306
Held to maturity, Total, Estimated Fair Value 34,994 41,202
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (490) (1,449)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (1,518) (1,037)
Held to maturity, Total, Gross Unrealized Losses $ (2,008) $ (2,486)
Held to maturity, Less Than 12 Months, Quantity | security 24 54,000
Held to maturity, 12 Months or Longer, Quantity | security 28 5,000
Available-for-sale Securities, Fair Value:    
Available for sale, Less Than 12 Months, Estimated Fair Value $ 12,440 $ 25,170
Available for sale, 12 Months or Longer, Estimated Fair Value 21,152 15,705
Available for sale, Total, Estimated Fair Value 33,592 40,875
Available-for-sale Securities, Gross Unrealized Losses:    
Available for sale, Less Than 12 Months, Gross Unrealized Losses (252) (292)
Available for sale, 12 Months or Longer, Gross Unrealized Losses (761) (602)
Available for sale, Total, Gross Unrealized Losses $ (1,013) $ (894)
Available-for-sale, Less than 12 Months, Quantity | security 9 16,000
Available-for-sale, 12 Months or Longer, Quantity | security 18 13,000
Private label residential    
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 21,709 $ 35,447
Held to maturity, 12 Months or Longer, Estimated Fair Value 22,643 8,708
Held to maturity, Total, Estimated Fair Value 44,352 44,155
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (686) (2,166)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (1,417) (226)
Held to maturity, Total, Gross Unrealized Losses $ (2,103) $ (2,392)
Held to maturity, Less Than 12 Months, Quantity | security 15 27,000
Held to maturity, 12 Months or Longer, Quantity | security 19 6,000
Taxable municipal securities    
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 2,034 $ 2,035
Held to maturity, 12 Months or Longer, Estimated Fair Value 0 0
Held to maturity, Total, Estimated Fair Value 2,034 2,035
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (48) (67)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses 0 0
Held to maturity, Total, Gross Unrealized Losses $ (48) $ (67)
Held to maturity, Less Than 12 Months, Quantity | security 1 1,000
Held to maturity, 12 Months or Longer, Quantity | security 0 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 472 0
Held to maturity, Total, Estimated Fair Value 472 469
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 (28) 0
Held to maturity, Total, Gross Unrealized Losses $ (28) $ (31)
Held to maturity, Less Than 12 Months, Quantity | security 0 1,000
Held to maturity, 12 Months or Longer, Quantity | security 1 0