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Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands		3 Months Ended			9 Months Ended		12 Months Ended
	May 31, 2024 USD ($)	Sep. 30, 2024 USD ($)	Mar. 31, 2024 numberOfVariable	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)	Apr. 30, 2024 store
Property, Plant and Equipment [Line Items]
Number of macroeconomic variables			3
Number of economic variables			4
Number of economic scenario variables			3
Number of economic forecast variables			4
Number of variables			2
Reasonable and supportable period (in months)			18 months
Historical loss rate on straight-line basis over loan's remaining maturity (in months)			12 months
Individually-evaluated loan analysis, loan threshold amount | $		$ 500			$ 500
Goodwill impairment | $	$ 104,200	$ 0		$ 0	$ 104,168	$ 0	$ 0
Banking Services
Property, Plant and Equipment [Line Items]
Number of locations | store								12
Lending Services
Property, Plant and Equipment [Line Items]
Number of locations | store								4

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