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Investment Securities - Schedule of AFS Debt Securities in an Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | $ 342,728 | $ 1,206,152
Less Than 12 Months, Gross Unrealized Losses | (2,674) | (76,494)
12 Months or Longer, Fair Value | 1,960,562 | 1,449,762
12 Months or Longer, Gross Unrealized Losses | (362,611) | (252,970)
Total Fair Value | 2,303,290 | 2,655,914
Total Gross Unrealized Losses | (365,285) | (329,464)
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 | 8,272 | 28,574
Less Than 12 Months, Gross Unrealized Losses | (24) | (1,118)
12 Months or Longer, Fair Value | 150,513 | 127,841
12 Months or Longer, Gross Unrealized Losses | (15,109) | (13,949)
Total Fair Value | 158,785 | 156,415
Total Gross Unrealized Losses | (15,133) | (15,067)
Debt Securities Issued by States and Political Subdivisions |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 236 | 11,341
Less Than 12 Months, Gross Unrealized Losses | (8) | (1,240)
12 Months or Longer, Fair Value | 60,152 | 49,985
12 Months or Longer, Gross Unrealized Losses | (13,112) | (11,342)
Total Fair Value | 60,388 | 61,326
Total Gross Unrealized Losses | (13,120) | (12,582)
Debt Securities Issued by Government-Sponsored Enterprises |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 0 | 47,825
Less Than 12 Months, Gross Unrealized Losses | 0 | (108)
12 Months or Longer, Fair Value | 1,639 | 803
12 Months or Longer, Gross Unrealized Losses | (117) | (71)
Total Fair Value | 1,639 | 48,628
Total Gross Unrealized Losses | (117) | (179)
Debt Securities Issued by Corporations |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 322,435 | 438,225
Less Than 12 Months, Gross Unrealized Losses | (2,565) | (7,995)
12 Months or Longer, Fair Value | 301,697 | 284,350
12 Months or Longer, Gross Unrealized Losses | (54,995) | (48,741)
Total Fair Value | 624,132 | 722,575
Total Gross Unrealized Losses | (57,560) | (56,736)
Residential - Government Agencies |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 11,455 | 386,809
Less Than 12 Months, Gross Unrealized Losses | (70) | (30,492)
12 Months or Longer, Fair Value | 616,352 | 340,824
12 Months or Longer, Gross Unrealized Losses | (108,736) | (65,723)
Total Fair Value | 627,807 | 727,633
Total Gross Unrealized Losses | (108,806) | (96,215)
Residential - U.S. Government-Sponsored Enterprises |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 330 | 194,684
Less Than 12 Months, Gross Unrealized Losses | (7) | (22,294)
12 Months or Longer, Fair Value | 699,020 | 598,986
12 Months or Longer, Gross Unrealized Losses | (142,085) | (103,816)
Total Fair Value | 699,350 | 793,670
Total Gross Unrealized Losses | (142,092) | (126,110)
Commercial - Government Agencies or Sponsored Agencies |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 0 | 98,694
Less Than 12 Months, Gross Unrealized Losses | 0 | (13,247)
12 Months or Longer, Fair Value | 131,189 | 46,973
12 Months or Longer, Gross Unrealized Losses | (28,457) | (9,328)
Total Fair Value | 131,189 | 145,667
Total Gross Unrealized Losses | (28,457) | (22,575)
Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 11,785 | 680,187
Less Than 12 Months, Gross Unrealized Losses | (77) | (66,033)
12 Months or Longer, Fair Value | 1,446,561 | 986,783
12 Months or Longer, Gross Unrealized Losses | (279,278) | (178,867)
Total Fair Value | 1,458,346 | 1,666,970
Total Gross Unrealized Losses | $ (279,355) | $ (244,900)

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