Subordinated Debentures - Summary (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Carrying Value	$ 332,001,000	$ 331,842,000
Subordinated notes
Debt Instrument [Line Items]
Face amount of debt instrument	335,000,000
Carrying Value	$ 332,001,000	331,842,000
Subordinated notes | Subordinated notes due 2024, 5.75% per annum
Debt Instrument [Line Items]
Fixed interest rate (as a percent)	5.75%
Current interest rate (as a percent)	5.75%
Face amount of debt instrument	$ 60,000,000
Carrying Value	$ 59,940,000	59,910,000
Subordinated notes | Subordinated notes due 2029, 4.875% per annum until May 15, 2024, 3-month term SOFR +2.762% thereafter
Debt Instrument [Line Items]
Fixed interest rate (as a percent)	4.875%
Current interest rate (as a percent)	4.875%
Face amount of debt instrument	$ 125,000,000
Carrying Value	$ 123,705,000	123,641,000
Subordinated notes | Subordinated notes due 2029, 4.875% per annum until May 15, 2024, 3-month term SOFR +2.762% thereafter | SOFR
Debt Instrument [Line Items]
Variable rate (as a percent)	2.762%
Subordinated notes | Subordinated notes due 2030, 5.375% per annum until June 15, 2025, 3-month term SOFR +5.17% thereafter
Debt Instrument [Line Items]
Fixed interest rate (as a percent)	5.375%
Current interest rate (as a percent)	5.375%
Face amount of debt instrument	$ 150,000,000
Carrying Value	$ 148,356,000	$ 148,291,000
Subordinated notes | Subordinated notes due 2030, 5.375% per annum until June 15, 2025, 3-month term SOFR +5.17% thereafter | SOFR
Debt Instrument [Line Items]
Variable rate (as a percent)	5.17%