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Investment Securities - Textual (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract] |  |  |
Held-to-maturity, interest receivable | $ 334,000 |  |
Available-for-sale, interest receivable | 9,700,000 |  |
Available-for-sale securities | 2,466,640,000 |  | $ 3,288,343,000
Securities valued at less than historical cost, amount | $ 640,524,000 |  |
Securities valued at less than historical cost (as percent) | 26.00% |  |
Decrease in available-for-sale provision for credit losses | $ (104,000,000) |  |
Securities pledged as collateral | 1,740,000,000 | $ 2,700,000 | $ 1,730,000,000
Realized gains | 32,100,000 |  |
Realized losses | (2,080) | $ 0 |
Investments sold, amount | $ 1,100,000,000 |  |
Income tax benefit related to security gains (losses) (as percent) |  |  | 26.135%

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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized as held-to-maturity or available-for-sale as a percentage of the total held-to-maturity and available-for-sale investment portfolio. + References No definition available. + Details
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- Definition Represents the tax expense/benefit related to security gains/losses as a percentage of the gross amounts. + References No definition available. + Details
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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 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 Reference 2: 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=118954083&loc=d3e26610-111562 Reference 3: 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=118939692&loc=d3e27161-111563 + Details
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- Definition Amount of expense (reversal of expense) for expected credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), from change in present value of expected cash flows. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82922868-210454 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922897-210455 + Details
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