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Stock Compensation Plans: Activity Related to Restricted Stock (Details) - Restricted Stock
 3 Months Ended
Dec. 31, 2023
$ / shares
shares
Number of Unvested Shares  
Outstanding, period start (in shares) | shares 26,150
Granted (in shares) | shares 0
Forfeited (in shares) | shares 0
Shares vested (in shares) | shares 0
Outstanding, period end (in shares) | shares 26,150
Weighted Average Grant Date Fair Value  
Outstanding, period start (in dollars per share) | $ / shares $ 27.37
Granted (in dollars per share) | $ / shares 0
Forfeited (in dollars per share) | $ / shares 0
Vested (in dollars per share) | $ / shares 0
Outstanding, period end (in dollars per share) | $ / shares $ 27.37