Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Interest income
Loans	$ 113,356	$ 123,432	$ 232,787	$ 245,763
Investment securities	11,329	9,957	22,827	19,145
Federal funds sold and other	558	497	1,166	1,039
Total interest income	125,243	133,886	256,780	265,947
Interest expense
Deposits	18,867	27,098	40,807	50,892
FHLB advances and other borrowings	3,155	1,923	6,268	3,926
Subordinated debentures and subordinated notes payable	1,238	1,390	2,549	2,760
Total interest expense	23,260	30,411	49,624	57,578
Net interest income	101,983	103,475	207,156	208,369
Provision for loan and lease losses	71,795	7,673	79,898	12,888
Net interest income after provision for loan and lease losses	30,188	95,802	127,258	195,481
Noninterest income
Service charges and other fees	9,188	10,209	20,597	21,897
Wealth management fees	3,122	2,117	6,086	4,358
Mortgage banking income, net	1,145	991	2,757	2,311
Net loss on sale of securities	0	0	0	(513)
Net increase in fair value of loans at fair value	35,541	14,018	20,608	33,234
Net realized and unrealized loss on derivatives	(50,214)	(11,032)	(36,698)	(29,348)
Other	1,135	1,920	2,300	3,004
Total noninterest (loss) income	(83)	18,223	15,650	34,943
Noninterest expense
Salaries and employee benefits	37,312	34,537	73,217	69,307
Data processing and communication	6,123	5,964	11,896	11,242
Occupancy and equipment	5,597	5,539	10,690	10,665
Professional fees	5,263	3,970	9,027	7,258
Advertising	958	1,216	1,823	2,154
Net loss on repossessed property and other related expenses	5,691	404	6,033	3,467
Goodwill and intangible assets impairment	742,352	0	742,352	0
Other	5,157	4,950	10,345	9,593
Total noninterest expense	808,453	56,580	865,383	113,686
(Loss) income before income taxes	(778,348)	57,445	(722,475)	116,738
(Benefit from) provision for income taxes	(37,730)	12,934	(25,131)	26,441
Net (loss) income	$ (740,618)	$ 44,511	$ (697,344)	$ 90,297
Basic earnings per common share
Weighted average shares outstanding (in shares)	55,906,002	56,994,817	56,141,816	57,484,838
Earnings per share (in dollars per share)	$ (13.25)	$ 0.78	$ (12.42)	$ 1.57
Diluted earnings per common share
Weighted average shares outstanding (in shares)	55,906,002	57,074,674	56,141,816	57,556,984
Diluted earnings per share (in dollars per share)	$ (13.25)	$ 0.78	$ (12.42)	$ 1.57
Dividends per share
Dividends paid	$ 16,769	$ 14,235	$ 33,654	$ 28,771
Dividends per share (in dollars per share)	$ 0.30	$ 0.25	$ 0.60	$ 0.50