FHLB Advances, Other Borrowings and Subordinated Notes - Narrative (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2023	Aug. 29, 2024	Aug. 28, 2024	Dec. 31, 2023	Dec. 31, 2019
Debt Instrument [Line Items]
Secured borrowings	$ 439,513,000	$ 439,513,000	$ 391,681,000			$ 401,897,000
Outstanding subordinated notes	298,188,000	298,188,000	437,731,000			437,866,000
Repayments of subordinated notes		140,000,000	0
Collateral Pledged
Debt Instrument [Line Items]
Pledged financial instruments	0	0
Securities Sold under Agreements to Repurchase | Maturity Overnight
Debt Instrument [Line Items]
Securities sold under agreements to repurchase	0	0	14,200,000			13,400,000
Secured Debt
Debt Instrument [Line Items]
Secured borrowings	10,900,000	10,900,000	8,900,000			9,400,000
Fixed Rate Promissory Note
Debt Instrument [Line Items]
Principal amount of debt	$ 66,400,000	$ 66,400,000
Stated interest rate	1.70%	1.70%
Term Loan Facility
Debt Instrument [Line Items]
Amount outstanding	$ 149,900,000	$ 149,900,000
Revolving Credit Facility
Debt Instrument [Line Items]
Amount outstanding	0	0
Receivables Purchase Agreement | Secured Debt
Debt Instrument [Line Items]
Borrowing capacity				$ 650,000,000	$ 520,000,000
Secured borrowings	428,600,000	$ 428,600,000	$ 382,800,000			$ 392,500,000
Basis spread on variable rate		0.825%
4.85% subordinated notes maturing in June 2029 | Subordinated Debt
Debt Instrument [Line Items]
Stated interest rate							4.85%
5.00% subordinated notes maturing in June 2024
Debt Instrument [Line Items]
Repayments of subordinated notes	$ 140,000,000
5.00% subordinated notes maturing in June 2024 | Subordinated Debt
Debt Instrument [Line Items]
Stated interest rate	5.00%	5.00%