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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
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)