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Investments - Narrative (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 1,065,223 | $ 882,682
Securities available for sale | $ 1,084,223 | $ 912,429
Maximum percentage of shareholders' equity security holdings held of one issuer | 10.00% | 10.00%
Securities pledged | $ 489,400 | $ 525,800
Mortgage-backed securities, weighted average life | 4 years |
Accrued interest receivable, held-to-maturity securities | $ 3,500 |
Allowance for credit losses on held-to-maturity debt securities | (449) | (449)
Other investments, at cost | 50,959 | 48,764
Des Moines |  |
Debt Securities, Available-for-sale [Line Items] |  |
Other investments, at cost | $ 12,000 | $ 10,800

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