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Investment Securities - Schedule of AFS Debt Securities in an Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | $ 2,687,057 | $ 318,953
Less Than 12 Months, Gross Unrealized Losses | (39,069) | (1,499)
12 Months or Longer, Fair Value | 150,063 | 165,159
12 Months or Longer, Gross Unrealized Losses | (3,780) | (876)
Total Fair Value | 2,837,120 | 484,112
Total Gross Unrealized Losses | (42,849) | (2,375)
Debt Securities Issued by the U.S. Treasury and Government Agencies |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 1,772 | 21,338
Less Than 12 Months, Gross Unrealized Losses | (4) | (42)
12 Months or Longer, Fair Value | 10,458 | 87,070
12 Months or Longer, Gross Unrealized Losses | (102) | (549)
Total Fair Value | 12,230 | 108,408
Total Gross Unrealized Losses | (106) | (591)
Debt Securities Issued by States and Political Subdivisions |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 413 |
Less Than 12 Months, Gross Unrealized Losses | (2) |
12 Months or Longer, Fair Value |  | 26
12 Months or Longer, Gross Unrealized Losses |  | (1)
Total Fair Value | 413 | 26
Total Gross Unrealized Losses | (2) | (1)
Debt Securities Issued by Government-Sponsored Enterprises |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 99 |
Less Than 12 Months, Gross Unrealized Losses | (1) |
Total Fair Value | 99 |
Total Gross Unrealized Losses | (1) |
Debt Securities Issued by Corporations |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 123,230 | 65,000
Less Than 12 Months, Gross Unrealized Losses | (734) | (853)
12 Months or Longer, Fair Value | 64,190 | 50,000
12 Months or Longer, Gross Unrealized Losses | (809) | (103)
Total Fair Value | 187,420 | 115,000
Total Gross Unrealized Losses | (1,543) | (956)
Residential - Government Agencies |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 804,605 | 113,538
Less Than 12 Months, Gross Unrealized Losses | (8,313) | (222)
12 Months or Longer, Fair Value | 7,954 | 28,063
12 Months or Longer, Gross Unrealized Losses | (170) | (223)
Total Fair Value | 812,559 | 141,601
Total Gross Unrealized Losses | (8,483) | (445)
Residential - U.S. Government-Sponsored Enterprises |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 1,756,938 | 94,002
Less Than 12 Months, Gross Unrealized Losses | (30,015) | (324)
12 Months or Longer, Fair Value | 43,773 |
12 Months or Longer, Gross Unrealized Losses | (2,025) |
Total Fair Value | 1,800,711 | 94,002
Total Gross Unrealized Losses | (32,040) | (324)
Commercial - Government Agencies |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value |  | 25,075
Less Than 12 Months, Gross Unrealized Losses |  | (58)
12 Months or Longer, Fair Value | 23,688 |
12 Months or Longer, Gross Unrealized Losses | (674) |
Total Fair Value | 23,688 | 25,075
Total Gross Unrealized Losses | (674) | (58)
Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 2,561,543 | 232,615
Less Than 12 Months, Gross Unrealized Losses | (38,328) | (604)
12 Months or Longer, Fair Value | 75,415 | 28,063
12 Months or Longer, Gross Unrealized Losses | (2,869) | (223)
Total Fair Value | 2,636,958 | 260,678
Total Gross Unrealized Losses | $ (41,197) | $ (827)

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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=124269663&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=123581744&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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