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Investment Securities - Unrealized Loss Position (Details) $ in Thousands | Dec. 31, 2020 USD ($) security | Dec. 31, 2019 USD ($) security
--- | --- | ---
Unrealized loss position for less than 12 months |  |
Fair Value | $ 537,162 | $ 879,683
Unrealized Loss | (636) | (2,260)
Unrealized loss position for more than 12 months |  |
Fair Value | 349,825 | 464,035
Unrealized Loss | $ (2,944) | $ (3,286)
Investment securities: |  |
Unrealized loss position for less than 12 months |  |
Number of securities in loss position | security | 27 | 57
Unrealized loss position for more than 12 months |  |
Number of securities in loss position | security | 62 | 62
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 | 19,171 | 18,912
Unrealized Loss | (493) | (788)
Floating Interest Rate | Floating rate asset-backed securities |  |
Unrealized loss position for less than 12 months |  |
Fair Value | 0 | 2,583
Unrealized Loss | 0 | (1)
Unrealized loss position for more than 12 months |  |
Fair Value | 6,231 | 8,502
Unrealized Loss | (1) | (6)
Floating Interest Rate | Guaranteed mortgage-backed securities |  |
Unrealized loss position for less than 12 months |  |
Fair Value | 172,842 | 841,993
Unrealized Loss | (593) | (2,244)
Unrealized loss position for more than 12 months |  |
Fair Value | 324,423 | 436,621
Unrealized Loss | (2,450) | (2,492)
Fixed Interest Rate | Fixed rate U.S. Treasuries |  |
Unrealized loss position for less than 12 months |  |
Fair Value | 364,320 | 35,107
Unrealized Loss | (43) | (15)
Unrealized loss position for more than 12 months |  |
Fair Value | 0 | 0
Unrealized Loss | $ 0 | $ 0

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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, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922890-210455 Reference 2: 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=121645371&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + 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, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + 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=121645371&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922890-210455 + Details
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