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Investment Securities - Income Earned on Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Non-taxable: |  |  |  |
Total | $ 48,751 | $ 37,848 | $ 97,525 | $ 71,560
Held-to-maturity |  |  |  |
Taxable: |  |  |  |
Taxable | 11,058 | 10,578 | 22,071 | 12,490
Non-taxable: |  |  |  |
Non-taxable | 10,225 | 10,088 | 20,351 | 16,190
Available-for-sale |  |  |  |
Taxable: |  |  |  |
Taxable | 21,687 | 11,217 | 43,478 | 27,453
Non-taxable: |  |  |  |
Non-taxable | $ 5,781 | $ 5,965 | $ 11,625 | $ 15,427

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- Definition Amount of operating interest income, including amortization and accretion of premiums and discounts, on securities exempt from state, federal and other income tax. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1402 -Paragraph (a) -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1402 -Paragraph (b) -Subparagraph (1) -Publisher SEC Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1 + Details
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