Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Net Income	$ 29,800	$ 56,006	$ 40,271
Other Comprehensive Income:
Unrealized Holding Gains (Losses) Arising During the Period	0	(31,204)	(4,060)
Reclassification Adjustment for Net Gains Realized in Income	0	(111)	(2,312)
Total Comprehensive Income	29,800	24,691	33,899
Less: Preferred Dividends	18,774	17,191	14,862
Less: Redemption of Preferred Stock	0	0	2,467
Comprehensive Income Attributable to Common Shareholders	$ 11,026	$ 7,500	$ 16,570