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Investments - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items] |  |  |
Maximum percentage of shareholders' equity security holdings held of one issuer | 10.00% |  | 10.00%
Securities pledged | $ 431,700 |  | $ 484,800
Mortgage-backed securities, weighted average life | 3 years |  |
Accrued interest receivable, available-for-sale securities | $ 4,500 |  |
Accrued interest receivable, held-to-maturity securities | 1,400 |  |
Allowance for credit losses on held-to-maturity debt securities | $ 303 | $ 0 |

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