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Investment Securities - Income Earned on Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Non-taxable: |  |  |  |
Total | $ 53,220 | $ 50,638 | $ 166,271 | $ 148,163
Held-to-maturity |  |  |  |
Taxable: |  |  |  |
Taxable | 10,533 | 11,062 | 32,378 | 33,133
Non-taxable: |  |  |  |
Non-taxable | 10,101 | 10,137 | 30,298 | 30,488
Available-for-sale |  |  |  |
Taxable: |  |  |  |
Taxable | 26,940 | 23,672 | 86,576 | 67,150
Non-taxable: |  |  |  |
Non-taxable | $ 5,646 | $ 5,767 | $ 17,019 | $ 17,392

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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://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/1943274/2147478524/942-220-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1402 -Paragraph b -Subparagraph (1)(Instruction 4) -Publisher SEC + Details
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