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Investment Securities - Income Earned on Securities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Interest Income, Securities, Operating, by Taxable Status [Abstract] |  |  |
Total | $ 64,533 | $ 63,376 | $ 53,460
Held-to-maturity |  |  |
Interest Income, Securities, Operating, by Taxable Status [Abstract] |  |  |
Taxable | 985 | 1,207 | 2,157
Non-taxable | 919 | 1,412 | 7,424
Available-for-sale |  |  |
Interest Income, Securities, Operating, by Taxable Status [Abstract] |  |  |
Taxable | 34,054 | 42,412 | 37,068
Non-taxable | $ 28,575 | $ 18,345 | $ 6,811

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