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Investments - Narrative (Details) $ in Thousands | Dec. 31, 2021 USD ($) number_of_securities | Dec. 31, 2020 USD ($) number_of_securities
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 1,358,960 | $ 882,682
Other investments | $ 59,896 | $ 48,764
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | number_of_securities | 290 | 30
Gross Unrealized Gains | $ 15,247 | $ 30,104
Maximum percentage of shareholders' equity security holdings held of one issuer | 10.00% |
Available-for-sale securities pledged as collateral, fair value | $ 752,700 | 525,800
accrued interest receivable, held to maturity securities | 3,400 | 3,600
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 614 | 449
Securities available-for-sale | 1,366,006 | 912,429
Des Moines |  |
Debt Securities, Available-for-sale [Line Items] |  |
Other investments | 12,100 | 10,800
Reclassified to Held to Maturity [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 331,000 |
Gross Unrealized Gains | 21,000 | $ 25,600
Securities available-for-sale | $ 352,600 |

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