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Subordinated Notes (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2014 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |  |  |
Outstanding subordinated notes |  |  | $ 437,392 | $ 436,938 |
Costs incurred in connection with the issuance of subordinated notes | $ 3,300 | $ 1,300 |  |  |
4.85% subordinated notes maturing in June 2029 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Proceeds, net of underwriting discount | 296,700 |  |  |  |
5.00% subordinated notes maturing in June 2024 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Proceeds, net of underwriting discount |  | 139,100 |  |  |
Subordinated debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Unamortized balances of costs for issuance of subordinated notes |  |  | $ 2,600 |  |
Subordinated debt | 4.85% subordinated notes maturing in June 2029 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount of debt | $ 300,000 |  |  |  |
Stated interest rate |  |  |  |  | 4.85%
Subordinated debt | 5.00% subordinated notes maturing in June 2024 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount of debt |  | $ 140,000 |  |  |
Stated interest rate |  | 5.00% |  |  |

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