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Loans - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, Purchased with Credit Deterioration, Discount (Premium) | $ 9,000 |  | $ 9,600 |
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available | 5,400,000 |  | 4,800,000 |
Proceeds from sale of SBA loans | 23,100 | $ 8,800 |  |
Gain on sale of SBA loans | 1,394 | 501 |  |
Consumer mortgage loans secured by residential real estate in process of foreclosure | 0 |  | 1,000 |
Allowance for credit loss adjustment | 40,300 |  |  |
Nonperforming loan balances, excluding government guaranteed balances | 9,600 |  | 10,700 |
Term Extension |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Default subsequent to term extension | 2,752 | 0 |  |
Other Assets |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accrued interest receivable | 71,200 |  | 66,700 |
Enterprise Value Lending Portfolio Niche Segment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for credit loss adjustment | 14,400 |  |  |
Commercial and industrial | Term Extension |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Default subsequent to term extension | 1,000 |  |  |
Non-Covered Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivable, allowance for credit loss | 135,498 | 138,295 | 134,771 | $ 136,932
Non-Covered Loans | Enterprise Value Lending Portfolio Niche Segment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivable, allowance for credit loss | 22,700 |  | 23,000 |
Non-Covered Loans | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivable, allowance for credit loss | 58,714 | $ 59,149 | $ 58,886 | $ 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 | $ 12,800 |  |  |

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