FHLB Advances, Other Borrowings and Subordinated Notes - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Aug. 29, 2024 CAD ($)	Aug. 28, 2024 CAD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2019
Debt Instrument [Line Items]
Secured borrowings	$ 337,065,000		$ 334,934,000			$ 341,704,000
Outstanding subordinated notes	298,360,000		298,283,000			437,965,000
Securities Sold under Agreements to Repurchase | Maturity Overnight
Debt Instrument [Line Items]
Securities sold under agreements to repurchase	0		0			10,900,000
Secured Debt
Debt Instrument [Line Items]
Secured borrowings	17,500,000		11,700,000			9,300,000
Fixed Rate Promissory Note
Debt Instrument [Line Items]
Principal amount of debt	$ 66,400,000
Stated interest rate	1.40%
Term Loan Facility
Debt Instrument [Line Items]
Amount outstanding	$ 135,600,000
Revolving Credit Facility
Debt Instrument [Line Items]
Amount outstanding	0
Receivables Purchase Agreement | Secured Debt
Debt Instrument [Line Items]
Borrowing capacity				$ 650	$ 520
Secured borrowings	$ 319,600,000		$ 323,200,000			$ 332,400,000
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%