Fair Value - Changes in Level 3 Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Mar. 31, 2025	Mar. 31, 2024	Sep. 30, 2024	Sep. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]				Mortgage Banking Income	Mortgage Banking Income
MSR [Member] | Recurring Basis [Member] | Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance		$ 139,317	$ 131,870	$ 131,870
Total net (loss) gain included in Mortgage banking, net	[1]	(7,990)	3,197
Additions		3,068	2,977
Sales		0	0
Ending Balance		134,395	138,044
The amount of total gains (losses) for the period included in earnings that are attributable to the change in unrealized gains or losses still held, end of period		(5,928)	5,123
Other Assets - Derivatives [Member] | Recurring Basis [Member] | Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance		229	845	$ 845
Total net (loss) gain included in Mortgage banking, net	[1]	748	1,047
Additions		0	0
Sales		(189)	(735)
Ending Balance		788	1,157
The amount of total gains (losses) for the period included in earnings that are attributable to the change in unrealized gains or losses still held, end of period		$ 345	$ 927

[1] Total net (loss) gain included in Mortgage banking, net relating to the MSR includes changes in fair value due to market changes and due to run-off.