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v3.24.0.1

Investments - Narrative (Details) | 12 Months Ended
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Dec. 31, 2023 USD ($) number_of_securities | Dec. 31, 2022 USD ($) number_of_securities | Dec. 31, 2021 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized cost | $ 1,769,134,000 | $ 1,729,054,000 |
Other investments | $ 66,195,000 | $ 63,790,000 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | number_of_securities | 753 | 740 |
Gross Unrealized Gains | $ 1,603,000 | $ 481,000 |
Maximum percentage of shareholders' equity security holdings held of one issuer | 10.00% | 10.00% |
Available-for-sale securities pledged as collateral, fair value | $ 1,600,000,000 | $ 734,500,000 |
Weighted average life (in years) | 5 years |  |
ACL on held-to-maturity securities | $ 785,000 | 735,000 |
Sale of debt securities, available-for-sale | 40,393,000 | 0 | $ 27,135,000
Gross gains realized | 601,000 | 0 | $ 0
Provisions For Credit Losses, Available-For-Sale | 4,200,000 |  |
Debt Securities, Provision For Credit Losses, Chargeoff | 4,200,000 |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest | 0 | 0 |
Accrued interest receivable, held-to-maturity securities | 6,500,000 | 5,800,000 |
Des Moines |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Other investments | 7,800,000 | 14,000,000 |
Reclassified to Held to Maturity [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Gross Unrealized Gains | 14,100,000 | 17,600,000 |
Debt Securities, Available-for-sale, Amortized Cost | $ 0 | $ 116,700,000 |

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