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Investment Securities - Schedule of AFS Debt Securities in an Unrealized Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | $ 238,023 | $ 1,206,152
Less Than 12 Months, Gross Unrealized Losses | (4,044) | (76,494)
12 Months or Longer, Fair Value | 2,089,545 | 1,449,762
12 Months or Longer, Gross Unrealized Losses | (281,739) | (252,970)
Total Fair Value | 2,327,568 | 2,655,914
Total Gross Unrealized Losses | (285,783) | (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 | 7,171 | 28,574
Less Than 12 Months, Gross Unrealized Losses | (16) | (1,118)
12 Months or Longer, Fair Value | 155,341 | 127,841
12 Months or Longer, Gross Unrealized Losses | (11,080) | (13,949)
Total Fair Value | 162,512 | 156,415
Total Gross Unrealized Losses | (11,096) | (15,067)
Debt Securities Issued by States and Political Subdivisions |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 237 | 11,341
Less Than 12 Months, Gross Unrealized Losses | (2) | (1,240)
12 Months or Longer, Fair Value | 63,509 | 49,985
12 Months or Longer, Gross Unrealized Losses | (9,609) | (11,342)
Total Fair Value | 63,746 | 61,326
Total Gross Unrealized Losses | (9,611) | (12,582)
Debt Securities Issued by Government-Sponsored Enterprises |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value |  | 47,825
Less Than 12 Months, Gross Unrealized Losses |  | (108)
12 Months or Longer, Fair Value | 1,476 | 803
12 Months or Longer, Gross Unrealized Losses | (80) | (71)
Total Fair Value | 1,476 | 48,628
Total Gross Unrealized Losses | (80) | (179)
Debt Securities Issued by Corporations |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 220,987 | 438,225
Less Than 12 Months, Gross Unrealized Losses | (4,013) | (7,995)
12 Months or Longer, Fair Value | 411,573 | 284,350
12 Months or Longer, Gross Unrealized Losses | (44,430) | (48,741)
Total Fair Value | 632,560 | 722,575
Total Gross Unrealized Losses | (48,443) | (56,736)
Residential - Government Agencies |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 9,628 | 386,809
Less Than 12 Months, Gross Unrealized Losses | (13) | (30,492)
12 Months or Longer, Fair Value | 613,926 | 340,824
12 Months or Longer, Gross Unrealized Losses | (84,772) | (65,723)
Total Fair Value | 623,554 | 727,633
Total Gross Unrealized Losses | (84,785) | (96,215)
Residential - U.S. Government-Sponsored Enterprises |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value |  | 194,684
Less Than 12 Months, Gross Unrealized Losses |  | (22,294)
12 Months or Longer, Fair Value | 708,797 | 598,986
12 Months or Longer, Gross Unrealized Losses | (109,176) | (103,816)
Total Fair Value | 708,797 | 793,670
Total Gross Unrealized Losses | (109,176) | (126,110)
Commercial - Government Agencies - Sponsored Agencies |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value |  | 98,694
Less Than 12 Months, Gross Unrealized Losses |  | (13,247)
12 Months or Longer, Fair Value | 134,923 | 46,973
12 Months or Longer, Gross Unrealized Losses | (22,592) | (9,328)
Total Fair Value | 134,923 | 145,667
Total Gross Unrealized Losses | (22,592) | (22,575)
Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 9,628 | 680,187
Less Than 12 Months, Gross Unrealized Losses | (13) | (66,033)
12 Months or Longer, Fair Value | 1,457,646 | 986,783
12 Months or Longer, Gross Unrealized Losses | (216,540) | (178,867)
Total Fair Value | 1,467,274 | 1,666,970
Total Gross Unrealized Losses | $ (216,553) | $ (244,900)

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