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Investment Securities - Schedule of AFS Debt Securities in an Unrealized Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | $ 2,808,862 | $ 318,953
Less Than 12 Months, Gross Unrealized Losses | (56,121) | (1,499)
12 Months or Longer, Fair Value | 317,559 | 165,159
12 Months or Longer, Gross Unrealized Losses | (10,167) | (876)
Total Fair Value | 3,126,421 | 484,112
Total Gross Unrealized Losses | (66,288) | (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 | 51,455 | 21,338
Less Than 12 Months, Gross Unrealized Losses | (195) | (42)
12 Months or Longer, Fair Value | 9,995 | 87,070
12 Months or Longer, Gross Unrealized Losses | (89) | (549)
Total Fair Value | 61,450 | 108,408
Total Gross Unrealized Losses | (284) | (591)
Debt Securities Issued by States and Political Subdivisions |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 643 |
Less Than 12 Months, Gross Unrealized Losses | (5) |
12 Months or Longer, Fair Value |  | 26
12 Months or Longer, Gross Unrealized Losses |  | (1)
Total Fair Value | 643 | 26
Total Gross Unrealized Losses | (5) | (1)
Debt Securities Issued by Government-Sponsored Enterprises |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 814 |
Less Than 12 Months, Gross Unrealized Losses | (10) |
12 Months or Longer, Fair Value | 49 |
12 Months or Longer, Gross Unrealized Losses | (1) |
Total Fair Value | 863 |
Total Gross Unrealized Losses | (11) |
Debt Securities Issued by Corporations |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 249,629 | 65,000
Less Than 12 Months, Gross Unrealized Losses | (2,846) | (853)
12 Months or Longer, Fair Value | 64,029 | 50,000
12 Months or Longer, Gross Unrealized Losses | (970) | (103)
Total Fair Value | 313,658 | 115,000
Total Gross Unrealized Losses | (3,816) | (956)
Residential - Government Agencies |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 810,157 | 113,538
Less Than 12 Months, Gross Unrealized Losses | (17,131) | (222)
12 Months or Longer, Fair Value | 41,471 | 28,063
12 Months or Longer, Gross Unrealized Losses | (1,635) | (223)
Total Fair Value | 851,628 | 141,601
Total Gross Unrealized Losses | (18,766) | (445)
Residential - U.S. Government-Sponsored Enterprises |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 1,670,500 | 94,002
Less Than 12 Months, Gross Unrealized Losses | (35,711) | (324)
12 Months or Longer, Fair Value | 180,205 |
12 Months or Longer, Gross Unrealized Losses | (6,536) |
Total Fair Value | 1,850,705 | 94,002
Total Gross Unrealized Losses | (42,247) | (324)
Commercial - Government Agencies |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 25,664 | 25,075
Less Than 12 Months, Gross Unrealized Losses | (223) | (58)
12 Months or Longer, Fair Value | 21,810 |
12 Months or Longer, Gross Unrealized Losses | (936) |
Total Fair Value | 47,474 | 25,075
Total Gross Unrealized Losses | (1,159) | (58)
Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 2,506,321 | 232,615
Less Than 12 Months, Gross Unrealized Losses | (53,065) | (604)
12 Months or Longer, Fair Value | 243,486 | 28,063
12 Months or Longer, Gross Unrealized Losses | (9,107) | (223)
Total Fair Value | 2,749,807 | 260,678
Total Gross Unrealized Losses | $ (62,172) | $ (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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- 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=123581744&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=124269663&loc=SL82922890-210455 + Details
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