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Investment Securities - Income Earned on Securities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Non-taxable: |  |  |
Total | $ 158,203 | $ 111,693 | $ 64,533
Held-to-Maturity Securities1 |  |  |
Taxable: |  |  |
Taxable | 33,778 | 4,208 | 985
Non-taxable: |  |  |
Non-taxable | 36,516 | 16,047 | 919
Available-for-Sale Securities1 |  |  |
Taxable: |  |  |
Taxable | 60,659 | 54,768 | 34,054
Non-taxable: |  |  |
Non-taxable | $ 27,250 | $ 36,670 | $ 28,575

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.2) -URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1402 -Paragraph (a) Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1402 -Paragraph (b) -Subparagraph (1) + Details
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