Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 12,974	$ 13,444	$ 28,015	$ 27,955
Noninterest income within the scope of other GAAP Topics	(13,057)	4,779	(12,365)	6,988
Total noninterest (loss) income	(83)	18,223	15,650	34,943
Service charges and other fees
Disaggregation of Revenue [Line Items]
Revenue	9,188	10,209	20,597	21,897
Wealth management fees
Disaggregation of Revenue [Line Items]
Revenue	3,122	2,117	6,086	4,358
Other
Disaggregation of Revenue [Line Items]
Revenue	$ 664	$ 1,118	$ 1,332	$ 1,700