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Investment Securities - Schedule of AFS Debt Securities in an Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | $ 2,958,470 | $ 2,808,862
Less Than 12 Months, Gross Unrealized Losses | (186,011) | (56,121)
12 Months or Longer, Fair Value | 1,036,280 | 317,559
12 Months or Longer, Gross Unrealized Losses | (106,523) | (10,167)
Total Fair Value | 3,994,750 | 3,126,421
Total Gross Unrealized Losses | (292,534) | (66,288)
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 | 155,571 | 51,455
Less Than 12 Months, Gross Unrealized Losses | (7,610) | (195)
12 Months or Longer, Fair Value | 9,150 | 9,995
12 Months or Longer, Gross Unrealized Losses | (83) | (89)
Total Fair Value | 164,721 | 61,450
Total Gross Unrealized Losses | (7,693) | (284)
Debt Securities Issued by States and Political Subdivisions |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 68,458 | 643
Less Than 12 Months, Gross Unrealized Losses | (5,062) | (5)
Total Fair Value | 68,458 | 643
Total Gross Unrealized Losses | (5,062) | (5)
Debt Securities Issued by Government-Sponsored Enterprises |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 1,654 | 814
Less Than 12 Months, Gross Unrealized Losses | (54) | (10)
12 Months or Longer, Fair Value | 46 | 49
12 Months or Longer, Gross Unrealized Losses | (3) | (1)
Total Fair Value | 1,700 | 863
Total Gross Unrealized Losses | (57) | (11)
Debt Securities Issued by Corporations |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 295,711 | 249,629
Less Than 12 Months, Gross Unrealized Losses | (19,798) | (2,846)
12 Months or Longer, Fair Value | 86,176 | 64,029
12 Months or Longer, Gross Unrealized Losses | (3,824) | (970)
Total Fair Value | 381,887 | 313,658
Total Gross Unrealized Losses | (23,622) | (3,816)
Residential - Government Agencies |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 1,053,590 | 810,157
Less Than 12 Months, Gross Unrealized Losses | (63,144) | (17,131)
12 Months or Longer, Fair Value | 134,437 | 41,471
12 Months or Longer, Gross Unrealized Losses | (14,891) | (1,635)
Total Fair Value | 1,188,027 | 851,628
Total Gross Unrealized Losses | (78,035) | (18,766)
Residential - U.S. Government-Sponsored Enterprises |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 1,228,427 | 1,670,500
Less Than 12 Months, Gross Unrealized Losses | (85,268) | (35,711)
12 Months or Longer, Fair Value | 786,229 | 180,205
12 Months or Longer, Gross Unrealized Losses | (85,665) | (6,536)
Total Fair Value | 2,014,656 | 1,850,705
Total Gross Unrealized Losses | (170,933) | (42,247)
Commercial - Government Agencies or Sponsored Agencies |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 155,059 | 25,664
Less Than 12 Months, Gross Unrealized Losses | (5,075) | (223)
12 Months or Longer, Fair Value | 20,242 | 21,810
12 Months or Longer, Gross Unrealized Losses | (2,057) | (936)
Total Fair Value | 175,301 | 47,474
Total Gross Unrealized Losses | (7,132) | (1,159)
Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 2,437,076 | 2,506,321
Less Than 12 Months, Gross Unrealized Losses | (153,487) | (53,065)
12 Months or Longer, Fair Value | 940,908 | 243,486
12 Months or Longer, Gross Unrealized Losses | (102,613) | (9,107)
Total Fair Value | 3,377,984 | 2,749,807
Total Gross Unrealized Losses | $ (256,100) | $ (62,172)

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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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