Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 11,249	$ 13,172	$ 39,264	$ 41,128
Noninterest income within the scope of other GAAP Topics	(22,932)	(2,406)	(35,297)	4,581
Total noninterest (loss) income	(11,683)	10,766	3,967	45,709
Service charges and other fees
Disaggregation of Revenue [Line Items]
Revenue	7,731	10,321	28,328	32,219
Wealth management fees
Disaggregation of Revenue [Line Items]
Revenue	2,773	2,234	8,859	6,592
Other
Disaggregation of Revenue [Line Items]
Revenue	$ 745	$ 617	$ 2,077	$ 2,317