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Investment Securities - Textual (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |
Held-to-maturity, interest receivable | $ 291,000 |  | $ 291,000 |  |
Available-for-sale, interest receivable | 12,100,000 |  | 12,100,000 |  |
Available-for-sale securities | 2,607,288,000 |  | 2,607,288,000 |  | $ 3,288,343,000
Securities valued at less than historical cost, amount | $ 475,133,000 |  | $ 475,133,000 |  |
Securities valued at less than historical cost (as percent) | 18.20% |  | 18.20% |  |
Decrease in available-for-sale provision for credit losses | $ 599,000 |  | $ 835,000 |  |
Securities pledged as collateral | 1,410,000,000 |  | 1,410,000,000 |  | $ 1,730,000,000
Realized gains | 22,300,000 | $ 7,600,000 | 54,800,000 | $ 12,900,000 |
Realized losses | $ 1,700 | $ 3,000 | 4,400 | $ 3,000 |
Investments sold, amount |  |  | $ 1,700,000,000 |  |
Income tax benefit related to security gains (losses) (as percent) |  |  | 26.135% | 26.135% |

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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