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Investment Securities - Unrealized Loss Position (Details) $ in Thousands | Mar. 31, 2019 USD ($) position | Dec. 31, 2018 USD ($) position
--- | --- | ---
Unrealized loss position for less than 12 months |  |
Fair Value | $ 984,827 | $ 1,433,453
Unrealized Loss | (3,465) | (3,281)
Unrealized loss position for more than 12 months |  |
Fair Value | 536,464 | 315,786
Unrealized Loss | $ (2,886) | $ (2,647)
Investment Securities [Member] |  |
Unrealized loss position for less than 12 months |  |
Number of securities in loss position | position | 48 | 72
Unrealized loss position for more than 12 months |  |
Number of securities in loss position | position | 63 | 48
Floating Interest Rate [Member] | Floating rate auction-rate certificates backed by Government guaranteed student loans |  |
Unrealized loss position for less than 12 months |  |
Fair Value | $ 0 | $ 0
Unrealized Loss | 0 | 0
Unrealized loss position for more than 12 months |  |
Fair Value | 18,912 | 18,715
Unrealized Loss | (788) | (985)
Floating Interest Rate [Member] | Asset-backed Securities [Member] |  |
Unrealized loss position for less than 12 months |  |
Fair Value | 6,179 | 6,456
Unrealized Loss | (56) | (38)
Unrealized loss position for more than 12 months |  |
Fair Value | 18,173 | 19,058
Unrealized Loss | (89) | (90)
Floating Interest Rate [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member] |  |
Unrealized loss position for less than 12 months |  |
Fair Value | 715,948 | 927,416
Unrealized Loss | (3,368) | (2,907)
Unrealized loss position for more than 12 months |  |
Fair Value | 381,997 | 196,416
Unrealized Loss | (1,948) | (1,360)
Fixed Interest Rate [Member] | US Treasury Securities [Member] |  |
Unrealized loss position for less than 12 months |  |
Fair Value | 262,700 | 499,581
Unrealized Loss | (41) | (336)
Unrealized loss position for more than 12 months |  |
Fair Value | 117,382 | 81,597
Unrealized Loss | $ (61) | $ (212)

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- Definition Number of investment positions in available-for-sale investments in a continuous unrealized loss position for less than one year or normal operating cycle, if longer, for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References No definition available. + Details
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- Definition Number of investment positions in available-for-sale investments that have been in a continuous unrealized loss position for greater than or equal to a year for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + 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), in continuous unrealized loss position for more than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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