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Investment Securities - Income Earned on Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Non-taxable: |  |  |  |
Total | $ 15,367 | $ 14,640 | $ 49,273 | $ 41,558
Held-to-maturity |  |  |  |
Taxable: |  |  |  |
Taxable | 248 | 528 | 975 | 1,641
Non-taxable: |  |  |  |
Non-taxable | 83 | 1,828 | 1,334 | 5,661
Available-for-sale |  |  |  |
Taxable: |  |  |  |
Taxable | 10,166 | 10,364 | 34,422 | 29,614
Non-taxable: |  |  |  |
Non-taxable | $ 4,870 | $ 1,920 | $ 12,542 | $ 4,642

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- Definition Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(b)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 + Details
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