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Securities - Narrative (Details) | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2024 USD ($) security | Dec. 31, 2023 USD ($) security | Mar. 31, 2024 USD ($) | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Schedule of Held-to-Maturity Securities [Line Items] |  |  |  |  |  |
Investment securities, carrying value | $ 144,400,000 |  |  |  |  |
Federal home loan bank | $ 1,200,000,000 |  |  |  |  |
Number of securities in unrealized loss positions | security | 2,314 | 2,290 |  |  |  |
Unrealized loss positions | $ 2,100,000,000 | $ 2,100,000,000 |  |  |  |
Percentage of portfolio | 86.50% | 85.10% |  |  |  |
Allowance for credit losses for available for sale debt securities | $ 0 | $ 0 |  |  |  |
Allowance for credit loss | 158,000 | 157,000 | $ 158,000 | $ 0 | $ 0 | $ 0
Investment securities, held to maturity | 1,904,439,000 | 1,945,795,000 |  |  |  |
Accrued interest receivable on available for sale debt securities | 14,400,000 | 14,700,000 |  |  |  |
State and municipal |  |  |  |  |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |  |  |  |  |
Allowance for credit loss | 21,000 | 20,000 |  |  |  |
Investment securities, held to maturity | 1,064,638,000 | 1,088,499,000 |  |  |  |
State and municipal | Internally-Assigned Rating Methodology |  |  |  |  |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |  |  |  |  |
Investment securities, held to maturity | $ 131,900,000 | $ 143,700,000 |  |  |  |

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