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Investment Securities - Unrealized Loss Position (Details) $ in Thousands | Dec. 31, 2019 USD ($) security | Dec. 31, 2018 USD ($) security
--- | --- | ---
Unrealized loss position for less than 12 months |  |
Fair Value | $ 879,683 | $ 1,433,453
Unrealized Loss | (2,260) | (3,281)
Unrealized loss position for more than 12 months |  |
Fair Value | 464,035 | 315,786
Unrealized Loss | $ (3,286) | $ (2,647)
Debt Securities |  |
Unrealized loss position for less than 12 months |  |
Number of securities in loss position | security | 57 | 72
Unrealized loss position for more than 12 months |  |
Number of securities in loss position | security | 62 | 48
Floating Interest Rate | 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 | Floating rate asset-backed securities |  |
Unrealized loss position for less than 12 months |  |
Fair Value | 2,583 | 6,456
Unrealized Loss | (1) | (38)
Unrealized loss position for more than 12 months |  |
Fair Value | 8,502 | 19,058
Unrealized Loss | (6) | (90)
Floating Interest Rate | Government/GSE Guaranteed Mortgage Backed Securities |  |
Unrealized loss position for less than 12 months |  |
Fair Value | 841,993 | 927,416
Unrealized Loss | (2,244) | (2,907)
Unrealized loss position for more than 12 months |  |
Fair Value | 436,621 | 196,416
Unrealized Loss | (2,492) | (1,360)
Fixed Interest Rate | Fixed rate U.S. Treasuries |  |
Unrealized loss position for less than 12 months |  |
Fair Value | 35,107 | 499,581
Unrealized Loss | (15) | (336)
Unrealized loss position for more than 12 months |  |
Fair Value | 0 | 81,597
Unrealized Loss | $ 0 | $ (212)

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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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