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Dividends and Share Repurchases (Details) - $ / shares				3 Months Ended		6 Months Ended
	Apr. 15, 2024	Mar. 08, 2024	Jan. 15, 2024	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Dividends Payable [Line Items]
Cash dividends per share (in dollars per share)		$ 0.26		$ 0.26	$ 0.25	$ 0.51	$ 0.49
Stock repurchased (in shares)				7,837
Average cost per share (in dollars per share)				$ 30.38
Remaining shares authorized to be repurchased (in shares)				1,853,453		1,853,453
Preferred stock dividends declared (in dollars per share)			$ 12.1875
Depository dividends declared (in dollars per share)			$ 0.30468750
Subsequent Event
Dividends Payable [Line Items]
Preferred stock dividends declared (in dollars per share)	$ 12.1875
Depository dividends declared (in dollars per share)	$ 0.30468750

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- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

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-Topic 505
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
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Total cost of shares repurchased divided by the total number of shares repurchased.

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