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Investment Securities - Schedule of Income Earned on Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Non-taxable: |  |  |  |
Total | $ 37,464 | $ 53,220 | $ 131,619 | $ 166,271
Held-to-maturity |  |  |  |
Taxable: |  |  |  |
Taxable | 2,370 | 10,533 | 22,993 | 32,378
Non-taxable: |  |  |  |
Non-taxable | 1,945 | 10,101 | 22,048 | 30,298
Available-for-sale |  |  |  |
Taxable: |  |  |  |
Taxable | 26,813 | 26,940 | 69,007 | 86,576
Non-taxable: |  |  |  |
Non-taxable | $ 6,336 | $ 5,646 | $ 17,571 | $ 17,019

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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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