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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
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)