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v3.22.1

Investments - Narrative (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 1,491,748,000 |  | $ 1,358,960,000
Cumulative net unamortized unrealized gain | $ 1,263,000 |  | 15,247,000
Maximum percentage of shareholders' equity security holdings held of one issuer | 10.00% |  |
Securities pledged | $ 581,400,000 |  | 752,700,000
Mortgage-backed securities, weighted average life | 5 years |  |
Allowance for credit losses on available-for-sale securities | $ 0 |  | 0
Accrued interest receivable, held-to-maturity securities | 4,100,000 |  | 3,400,000
Allowance for credit losses on held-to-maturity debt securities | (558,000) |  | (614,000)
Sale of debt securities, available-for-sale | 0 | $ 0 |
Other investments, at cost | 60,444,000 |  | 59,896,000
Reclassified to Held to Maturity |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 116,900,000 |  |
Cumulative net unamortized unrealized gain | 20,300,000 |  | 21,000,000
Des Moines |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Other investments, at cost | $ 12,000,000 |  | $ 12,100,000

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