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Investment Securities - Income Earned on Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Non-taxable: |  |  |  |
Total | $ 13,473 | $ 15,666 | $ 32,416 | $ 31,947
Held-to-maturity |  |  |  |
Taxable: |  |  |  |
Taxable | 288 | 289 | 459 | 727
Non-taxable: |  |  |  |
Non-taxable | 68 | 89 | 140 | 1,251
Available-for-sale |  |  |  |
Taxable: |  |  |  |
Taxable | 7,086 | 10,777 | 19,667 | 22,297
Non-taxable: |  |  |  |
Non-taxable | $ 6,031 | $ 4,511 | $ 12,150 | $ 7,672

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