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Investment Securities - Income Earned on Securities (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Non-taxable: |  |
Total | $ 48,774 | $ 33,712
Held-to-maturity |  |
Taxable: |  |
Taxable | 11,013 | 1,912
Non-taxable: |  |
Non-taxable | 10,126 | 6,102
Available-for-sale |  |
Taxable: |  |
Taxable | 21,791 | 16,236
Non-taxable: |  |
Non-taxable | $ 5,844 | $ 9,462

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