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Loans - Narrative (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2024 USD ($) loan | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) | Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Financing Receivable, Purchased with Credit Deterioration, Discount (Premium) | $ 9,200 |  |  | $ 9,600 |  |  |
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available | 5,500,000 | $ 5,500,000 |  | 4,800,000 |  |  |
Proceeds from sale of SBA loans | 0 | 23,100 | $ 8,800 |  |  |  |
Gain on sale of SBA loans |  | 1,415 | 501 |  |  |  |
Consumer mortgage loans secured by residential real estate in process of foreclosure | 0 | 0 |  | 1,000 |  |  |
Financing receivable, allowance for credit loss | 139,464 | 139,464 |  | 134,771 |  |  |
Allowance for credit loss adjustment | 42,200 | 42,200 |  |  |  |  |
Nonperforming loan balances, excluding government guaranteed balances | $ 12,900 | 12,900 |  | 10,700 |  |  |
Number of loans that experienced default | loan | 0 |  |  |  |  |  |
Other Assets |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Accrued interest receivable | $ 70,100 | 70,100 |  | 66,700 |  |  |
Enterprise Value Lending Portfolio Niche Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for credit loss adjustment | 12,600 | 12,600 |  |  |  |  |
Commercial and industrial | Term Extension |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Default subsequent to term extension |  |  | 700 |  |  |  |
Non-Covered Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Financing receivable, allowance for credit loss | 139,464 | 139,464 | 141,319 | 134,771 | $ 135,498 | $ 138,295 | $ 136,932
Non-Covered Loans | Enterprise Value Lending Portfolio Niche Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Financing receivable, allowance for credit loss | 19,900 | 19,900 |  | 23,000 |  |  |
Non-Covered Loans | Commercial and industrial |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Financing receivable, allowance for credit loss | 61,478 | 61,478 | $ 60,318 | $ 58,886 | $ 58,714 | $ 59,149 | $ 53,835
Cumulative Effect, Period Of Adoption, Adjustment | Non-Covered Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Financing receivable, allowance for credit loss | $ 14,600 | $ 14,600 |  |  |  |  |
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 |  |  |  |  |
Cumulative Effect, Period Of Adoption, Adjustment | Non-Covered Loans | Minimum |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Federal funds forecast | 0.0525 | 0.0525 |  |  |  |  |
Cumulative Effect, Period Of Adoption, Adjustment | Non-Covered Loans | Maximum |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Federal funds forecast | 0.0550 | 0.0550 |  |  |  |  |

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