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Investment Securities: Unrealized Gain (Loss) on Investments (Details)
$ in Thousands
Sep. 30, 2022
USD ($)
security
Sep. 30, 2021
USD ($)
security
Held-to-maturity Securities, Fair Value:    
Estimated Fair Value - Less Than 12 Months $ 189,351 $ 36,598
Estimated Fair Value - 12 Months or Longer 47,652 16
Total Estimated Fair Value 237,003 36,614
Held-to-maturity Securities, Gross Unrealized Losses    
Gross Unrealized Losses - Less Than 12 Months (10,937) (244)
Gross Unrealized Losses - 12 Months or Longer (6,148) 0
Total Gross Unrealized Losses $ (17,085) $ (244)
Held-to-maturity, Qty, Less Than 12 Months | security 100 14
Held-to-maturity, Qty, 12 Months or Longer | security 20 4
Estimated Fair Value - Less Than 12 Months $ 25,170 $ 20,146
Estimated Fair Value - 12 Months or Longer 15,705 5,491
Total Estimated Fair Value 40,875 25,637
Available-for-sale Securities, Gross Unrealized Losses:    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Accumulated Loss (292) (103)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (602) (11)
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ (894) $ (114)
Available-for-sale, Qty, Less than 12 Months | security 16 13
Available-for-sale, Qty, 12 Months or Longer | security 13 3
U.S. Treasury and U.S. government agency securities    
Held-to-maturity Securities, Fair Value:    
Estimated Fair Value - Less Than 12 Months $ 115,504 $ 18,795
Estimated Fair Value - 12 Months or Longer 33,638 0
Total Estimated Fair Value 149,142 18,795
Held-to-maturity Securities, Gross Unrealized Losses    
Gross Unrealized Losses - Less Than 12 Months (7,224) (99)
Gross Unrealized Losses - 12 Months or Longer (4,885) 0
Total Gross Unrealized Losses $ (12,109) $ (99)
Held-to-maturity, Qty, Less Than 12 Months | security 17 5
Held-to-maturity, Qty, 12 Months or Longer | security 9 0
Mortgage-backed securities, U.S. government agencies    
Held-to-maturity Securities, Fair Value:    
Estimated Fair Value - Less Than 12 Months $ 35,896 $ 8,091
Estimated Fair Value - 12 Months or Longer 5,306 15
Total Estimated Fair Value 41,202 8,106
Held-to-maturity Securities, Gross Unrealized Losses    
Gross Unrealized Losses - Less Than 12 Months (1,449) (122)
Gross Unrealized Losses - 12 Months or Longer (1,037) 0
Total Gross Unrealized Losses $ (2,486) $ (122)
Held-to-maturity, Qty, Less Than 12 Months | security 54 5
Held-to-maturity, Qty, 12 Months or Longer | security 5 3
Estimated Fair Value - Less Than 12 Months $ 25,170 $ 20,146
Estimated Fair Value - 12 Months or Longer 15,705 5,491
Total Estimated Fair Value 40,875 25,637
Available-for-sale Securities, Gross Unrealized Losses:    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Accumulated Loss (292) (103)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (602) (11)
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ (894) $ (114)
Available-for-sale, Qty, Less than 12 Months | security 16 13
Available-for-sale, Qty, 12 Months or Longer | security 13 3
Mortgage-backed securities, Private label residential    
Held-to-maturity Securities, Fair Value:    
Estimated Fair Value - Less Than 12 Months $ 35,447 $ 9,712
Estimated Fair Value - 12 Months or Longer 8,708 1
Total Estimated Fair Value 44,155 9,713
Held-to-maturity Securities, Gross Unrealized Losses    
Gross Unrealized Losses - Less Than 12 Months (2,166) (23)
Gross Unrealized Losses - 12 Months or Longer (226) 0
Total Gross Unrealized Losses $ (2,392) $ (23)
Held-to-maturity, Qty, Less Than 12 Months | security 27 4
Held-to-maturity, Qty, 12 Months or Longer | security 6 1
Taxable municipal securities    
Held-to-maturity Securities, Fair Value:    
Estimated Fair Value - Less Than 12 Months $ 2,035  
Estimated Fair Value - 12 Months or Longer 0  
Total Estimated Fair Value 2,035  
Held-to-maturity Securities, Gross Unrealized Losses    
Gross Unrealized Losses - Less Than 12 Months (67)  
Gross Unrealized Losses - 12 Months or Longer 0  
Total Gross Unrealized Losses $ (67)  
Held-to-maturity, Qty, Less Than 12 Months | security 1  
Held-to-maturity, Qty, 12 Months or Longer | security 0  
Bank issued trust preferred securities    
Held-to-maturity Securities, Fair Value:    
Estimated Fair Value - Less Than 12 Months $ 469  
Estimated Fair Value - 12 Months or Longer 0  
Total Estimated Fair Value 469  
Held-to-maturity Securities, Gross Unrealized Losses    
Gross Unrealized Losses - Less Than 12 Months (31)  
Gross Unrealized Losses - 12 Months or Longer 0  
Total Gross Unrealized Losses $ (31)  
Held-to-maturity, Qty, Less Than 12 Months | security 1  
Held-to-maturity, Qty, 12 Months or Longer | security 0