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Investments - Narrative (Details) - USD ($) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 960,984 |  | $ 1,115,323
Securities available for sale | 998,104 |  | $ 1,135,317
accumulated other comprehensive income loss available for sale securities adjustment pre tax | $ 11,500 |  |
Maximum percentage of shareholders' equity security holdings held of one issuer | 10.00% |  | 10.00%
Securities pledged | $ 449,900 |  | $ 484,800
Mortgage-backed securities, weighted average life | 3 years |  |
Accrued interest receivable, available-for-sale securities | $ 3,600 |  |
Accrued interest receivable, held-to-maturity securities | 2,300 |  |
Allowance for credit losses on held-to-maturity debt securities | 645 | $ 0 |
Reclassified to Held to Maturity [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 163,600 |  |
Securities available for sale | $ 175,100 |  |

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