Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Name:	us-gaap_OtherCommitmentsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2022	Dec. 31, 2021
Other Commitments [Line Items]
Reserve for unfunded lending commitments	$ 28,894	$ 24,053	$ 33,309	$ 29,334
Federal Deposit Insurance Corporation (FDIC) Special Assessment [Member]
Other Commitments [Line Items]
Pre-tax special assessment expense	$ 26,100