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Investment Securities - Income Earned on Securities (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Non-taxable: |  |
Total | $ 18,943 | $ 16,281
Held-to-maturity |  |
Taxable: |  |
Taxable | 171 | 438
Non-taxable: |  |
Non-taxable | 72 | 1,162
Available-for-sale |  |
Taxable: |  |
Taxable | 12,581 | 11,520
Non-taxable: |  |
Non-taxable | $ 6,119 | $ 3,161

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