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Investment Securities - Unrealized Loss Position (Details) $ in Thousands | Mar. 31, 2021 USD ($) security | Dec. 31, 2020 USD ($) security
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position for less than 12 months, Fair Value | $ 421,167 | $ 537,162
Unrealized loss position for less than 12 months, Unrealized Loss | (483) | (636)
Unrealized loss position for more than 12 months, Fair Value | 313,022 | 349,825
Unrealized loss position for more than 12 months, Unrealized Loss | $ (2,996) | $ (2,944)
Investment securities: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position for less than 12 months, Number of securities in loss position | security | 27 | 27
Unrealized loss position for more than 12 months, Number of securities in loss position | security | 55 | 62
Floating Interest Rate | Floating rate auction-rate certificates backed by Government guaranteed student loans |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position for less than 12 months, Fair Value | $ 0 | $ 0
Unrealized loss position for less than 12 months, Unrealized Loss | 0 | 0
Unrealized loss position for more than 12 months, Fair Value | 19,146 | 19,171
Unrealized loss position for more than 12 months, Unrealized Loss | (493) | (493)
Floating Interest Rate | Floating rate asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position for less than 12 months, Fair Value |  | 0
Unrealized loss position for less than 12 months, Unrealized Loss |  | 0
Unrealized loss position for more than 12 months, Fair Value |  | 6,231
Unrealized loss position for more than 12 months, Unrealized Loss |  | (1)
Floating Interest Rate | Guaranteed mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position for less than 12 months, Fair Value | 142,747 | 172,842
Unrealized loss position for less than 12 months, Unrealized Loss | (434) | (593)
Unrealized loss position for more than 12 months, Fair Value | 293,876 | 324,423
Unrealized loss position for more than 12 months, Unrealized Loss | (2,503) | (2,450)
Fixed Interest Rate | Fixed rate U.S. Treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position for less than 12 months, Fair Value | 278,420 | 364,320
Unrealized loss position for less than 12 months, Unrealized Loss | (49) | (43)
Unrealized loss position for more than 12 months, Fair Value | 0 | 0
Unrealized loss position for more than 12 months, 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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- Definition Number of investments in debt securities 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 an allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922888-210455 + Details
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