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Investment Securities - Schedule of AFS Debt Securities in an Unrealized Loss Position (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
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Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | $ 480,072 | $ 1,206,152
Less Than 12 Months, Gross Unrealized Losses | (4,753) | (76,494)
12 Months or Longer, Fair Value | 2,067,926 | 1,449,762
12 Months or Longer, Gross Unrealized Losses | (322,868) | (252,970)
Total Fair Value | 2,547,998 | 2,655,914
Total Gross Unrealized Losses | (327,621) | (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 | 13,669 | 28,574
Less Than 12 Months, Gross Unrealized Losses | (54) | (1,118)
12 Months or Longer, Fair Value | 145,838 | 127,841
12 Months or Longer, Gross Unrealized Losses | (14,515) | (13,949)
Total Fair Value | 159,507 | 156,415
Total Gross Unrealized Losses | (14,569) | (15,067)
Debt Securities Issued by States and Political Subdivisions |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 25,209 | 11,341
Less Than 12 Months, Gross Unrealized Losses | (126) | (1,240)
12 Months or Longer, Fair Value | 62,113 | 49,985
12 Months or Longer, Gross Unrealized Losses | (11,097) | (11,342)
Total Fair Value | 87,322 | 61,326
Total Gross Unrealized Losses | (11,223) | (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 | 1,636 | 803
12 Months or Longer, Gross Unrealized Losses | (120) | (71)
Total Fair Value | 1,636 | 48,628
Total Gross Unrealized Losses | (120) | (179)
Debt Securities Issued by Corporations |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 376,871 | 438,225
Less Than 12 Months, Gross Unrealized Losses | (2,133) | (7,995)
12 Months or Longer, Fair Value | 368,538 | 284,350
12 Months or Longer, Gross Unrealized Losses | (54,252) | (48,741)
Total Fair Value | 745,409 | 722,575
Total Gross Unrealized Losses | (56,385) | (56,736)
Residential - Government Agencies |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 53,525 | 386,809
Less Than 12 Months, Gross Unrealized Losses | (1,939) | (30,492)
12 Months or Longer, Fair Value | 617,092 | 340,824
12 Months or Longer, Gross Unrealized Losses | (94,037) | (65,723)
Total Fair Value | 670,617 | 727,633
Total Gross Unrealized Losses | (95,976) | (96,215)
Residential - U.S. Government-Sponsored Enterprises |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 10,064 | 194,684
Less Than 12 Months, Gross Unrealized Losses | (468) | (22,294)
12 Months or Longer, Fair Value | 734,650 | 598,986
12 Months or Longer, Gross Unrealized Losses | (124,199) | (103,816)
Total Fair Value | 744,714 | 793,670
Total Gross Unrealized Losses | (124,667) | (126,110)
Commercial - Government Agencies or Sponsored Agencies |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 734 | 98,694
Less Than 12 Months, Gross Unrealized Losses | (33) | (13,247)
12 Months or Longer, Fair Value | 138,059 | 46,973
12 Months or Longer, Gross Unrealized Losses | (24,648) | (9,328)
Total Fair Value | 138,793 | 145,667
Total Gross Unrealized Losses | (24,681) | (22,575)
Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 64,323 | 680,187
Less Than 12 Months, Gross Unrealized Losses | (2,440) | (66,033)
12 Months or Longer, Fair Value | 1,489,801 | 986,783
12 Months or Longer, Gross Unrealized Losses | (242,884) | (178,867)
Total Fair Value | 1,554,124 | 1,666,970
Total Gross Unrealized Losses | $ (245,324) | $ (244,900)

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