FHLB Advances, Other Borrowings and Subordinated Notes - Narrative (Details) - USD ($)			3 Months Ended	6 Months Ended
	May 31, 2023	May 30, 2023	Jun. 30, 2024	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023	Dec. 31, 2019
Debt Instrument [Line Items]
Secured borrowings			$ 391,395,000	$ 391,395,000	$ 401,669,000	$ 401,897,000
Outstanding subordinated notes			298,113,000	298,113,000	437,628,000	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	16,300,000	13,400,000
Secured Debt
Debt Instrument [Line Items]
Secured borrowings			11,100,000	11,100,000	9,300,000	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			$ 157,000,000.0	$ 157,000,000.0
Revolving Credit Facility
Debt Instrument [Line Items]
Amount outstanding			0	0
Receivables Purchase Agreement | Secured Debt
Debt Instrument [Line Items]
Borrowing capacity	$ 520,000,000	$ 420,000,000
Borrowing fee rate	0.825%	0.775%
Secured borrowings			380,300,000	$ 380,300,000	$ 392,400,000	$ 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%