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v3.21.2

Investments - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 1,211,293 |  | $ 1,211,293 |  | $ 882,682
Maximum percentage of shareholders' equity security holdings held of one issuer | 10.00% |  | 10.00% |  | 10.00%
Securities pledged | $ 582,300 |  | $ 582,300 |  | $ 525,800
Mortgage-backed securities, weighted average life |  |  | 4 years |  |
Accrued interest receivable, held-to-maturity securities | 3,500 |  | $ 3,500 |  | 3,600
Provision for credit losses on held-to-maturity securities | 200 |  |  |  |
Sale of debt securities, available-for-sale | 27,100 | $ 20,000 | 27,135 | $ 20,221 |
Allowance for credit losses on held-to-maturity debt securities | (640) |  | (640) |  | (449)
Other investments, at cost | 59,156 |  | 59,156 |  | 48,764
Des Moines |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Other investments, at cost | $ 12,100 |  | $ 12,100 |  | $ 10,800

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