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Investment Securities: Unrealized Gain (Loss) on Investments (Details) $ in Thousands	Sep. 30, 2019 USD ($) security	Sep. 30, 2018 USD ($) security
Held-to-maturity Securities, Fair Value:
Estimated Fair Value - Less Than 12 Months	$ 291	$ 8,900
Estimated Fair Value - 12 Months or Longer	3,090	3,049
Total Estimated Fair Value	3,381	11,949
Held-to-maturity Securities, Gross Unrealized Losses
Gross Unrealized Losses - Less Than 12 Months	(1)	(42)
Gross Unrealized Losses - 12 Months or Longer	(10)	(64)
Total Gross Unrealized Losses	$ (11)	$ (106)
Held-to-maturity, Qty, Less Than 12 Months | security	2	4
Held-to-maturity, Qty, 12 Months or Longer | security	12	14
Estimated Fair Value - Less Than 12 Months		$ 34
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		(1)
Estimated Fair Value - 12 Months or Longer		917
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		(83)
Total Estimated Fair Value		951
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		$ (84)
Available-for-sale Securities, Gross Unrealized Losses:
Available-for-sale, Qty, Less than 12 Months | security		1
Available-for-sale, Qty, 12 Months or Longer | security		1
Mortgage-backed Securities, U.S. government agencies
Held-to-maturity Securities, Fair Value:
Estimated Fair Value - Less Than 12 Months	$ 291	$ 954
Estimated Fair Value - 12 Months or Longer	76	64
Total Estimated Fair Value	367	1,018
Held-to-maturity Securities, Gross Unrealized Losses
Gross Unrealized Losses - Less Than 12 Months	(1)	(20)
Gross Unrealized Losses - 12 Months or Longer	(1)	(1)
Total Gross Unrealized Losses	$ (2)	$ (21)
Held-to-maturity, Qty, Less Than 12 Months | security	2	2
Held-to-maturity, Qty, 12 Months or Longer | security	6	5
Estimated Fair Value - Less Than 12 Months		$ 34
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		(1)
Estimated Fair Value - 12 Months or Longer		0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		0
Total Estimated Fair Value		34
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		$ (1)
Available-for-sale Securities, Gross Unrealized Losses:
Available-for-sale, Qty, Less than 12 Months | security		1
Available-for-sale, Qty, 12 Months or Longer | security		0
Mortgage-backed Securities, Private label residential
Held-to-maturity Securities, Fair Value:
Estimated Fair Value - Less Than 12 Months	$ 0	$ 0
Estimated Fair Value - 12 Months or Longer	23	50
Total Estimated Fair Value	23	50
Held-to-maturity Securities, Gross Unrealized Losses
Gross Unrealized Losses - Less Than 12 Months	0	0
Gross Unrealized Losses - 12 Months or Longer	(1)	(2)
Total Gross Unrealized Losses	$ (1)	$ (2)
Held-to-maturity, Qty, Less Than 12 Months | security	0	0
Held-to-maturity, Qty, 12 Months or Longer | security	5	8
US Government Agencies Debt Securities
Held-to-maturity Securities, Fair Value:
Estimated Fair Value - Less Than 12 Months	$ 0	$ 7,946
Estimated Fair Value - 12 Months or Longer	2,991	2,935
Total Estimated Fair Value	2,991	10,881
Held-to-maturity Securities, Gross Unrealized Losses
Gross Unrealized Losses - Less Than 12 Months	0	(22)
Gross Unrealized Losses - 12 Months or Longer	(8)	(61)
Total Gross Unrealized Losses	$ (8)	$ (83)
Held-to-maturity, Qty, Less Than 12 Months | security	0	2
Held-to-maturity, Qty, 12 Months or Longer | security	1	1
Mutual funds
Held-to-maturity Securities, Gross Unrealized Losses
Estimated Fair Value - Less Than 12 Months		$ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		0
Estimated Fair Value - 12 Months or Longer		917
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		(83)
Total Estimated Fair Value		917
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		$ (83)
Available-for-sale Securities, Gross Unrealized Losses:
Available-for-sale, Qty, Less than 12 Months | security		0
Available-for-sale, Qty, 12 Months or Longer | security		1

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