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Loans - Narrative (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2024 USD ($) loan | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Purchased with Credit Deterioration, Discount (Premium) | $ 8,500,000 |  |  |  | $ 9,600,000 |  |  |
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available | 5,500,000,000 |  | $ 5,500,000,000 |  | 4,800,000,000 |  |  |
Proceeds from sale of SBA loans | 23,100,000 | $ 33,300,000 | 1,400,000 | $ 42,100,000 |  |  |  |
Gain on sale of SBA loans |  | 1,500,000 | 1,415,000 | 2,015,000 |  |  |  |
Consumer mortgage loans secured by residential real estate in process of foreclosure | 0 |  | 0 |  | 1,000,000.0 |  |  |
Financing receivable, allowance for credit loss | 139,778,000 |  | 139,778,000 |  | 134,771,000 |  |  |
Allowance for credit loss adjustment | 49,100,000 |  | 49,100,000 |  |  |  |  |
Nonperforming loan balances, excluding government guaranteed balances | $ 11,900,000 |  | 11,900,000 |  | 10,700,000 |  |  |
Number of loans that experienced default | loan | 0 |  |  |  |  |  |  |
Other Assets |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Accrued interest receivable | $ 52,500,000 |  | 52,500,000 |  | 66,700,000 |  |  |
Enterprise Value Lending Portfolio Niche Segment |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Allowance for credit loss adjustment | 16,100,000 |  | 16,100,000 |  |  |  |  |
Non-Covered Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of SBA loans | 0 |  |  |  |  |  |  |
Financing receivable, allowance for credit loss | 139,778,000 | 142,133,000 | 139,778,000 | 142,133,000 | 134,771,000 | $ 139,464,000 | $ 141,319,000 | $ 136,932,000
Non-Covered Loans | Enterprise Value Lending Portfolio Niche Segment |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing receivable, allowance for credit loss | 23,000,000.0 |  | 23,000,000.0 |  |  |  |  |
Non-Covered Loans | Commercial and industrial |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing receivable, allowance for credit loss | 64,060,000 | $ 62,476,000 | 64,060,000 | $ 62,476,000 | $ 58,886,000 | $ 61,478,000 | $ 60,318,000 | $ 53,835,000
Cumulative Effect, Period Of Adoption, Adjustment | Non-Covered Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing receivable, allowance for credit loss | $ 14,500,000 |  | $ 14,500,000 |  |  |  |  |
Cumulative Effect, Period Of Adoption, Adjustment | Non-Covered Loans | Baseline |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Growth upside forecast | 0.40 |  | 0.40 |  |  |  |  |
Cumulative Effect, Period Of Adoption, Adjustment | Non-Covered Loans | Near-term growth upside |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Growth upside forecast | 0.30 |  | 0.30 |  |  |  |  |
Cumulative Effect, Period Of Adoption, Adjustment | Non-Covered Loans | Moderate recession downside |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Growth upside forecast | 0.30 |  | 0.30 |  |  |  |  |

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