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Investment Securities - Schedule of AFS Debt Securities in an Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months, Fair Value $ 776,320 $ 309,470
Less Than 12 Months, Gross Unrealized Losses (41,778) (676)
12 Months or Longer, Fair Value 1,620,297 2,050,731
12 Months or Longer, Gross Unrealized Losses (165,168) (258,459)
Total Fair Value 2,396,617 2,360,201
Total Gross Unrealized Losses (206,946) (259,135)
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 44,920 38,854
Less Than 12 Months, Gross Unrealized Losses (787) (288)
12 Months or Longer, Fair Value 101,097 157,456
12 Months or Longer, Gross Unrealized Losses (4,333) (7,897)
Total Fair Value 146,017 196,310
Total Gross Unrealized Losses (5,120) (8,185)
Debt Securities Issued by States and Political Subdivisions    
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months, Fair Value 0 0
Less Than 12 Months, Gross Unrealized Losses 0 0
12 Months or Longer, Fair Value 65,560 63,644
12 Months or Longer, Gross Unrealized Losses (6,983) (9,349)
Total Fair Value 65,560 63,644
Total Gross Unrealized Losses (6,983) (9,349)
Debt Securities Issued by U.S. Government-Sponsored Enterprises    
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months, Fair Value 0 0
Less Than 12 Months, Gross Unrealized Losses 0 0
12 Months or Longer, Fair Value 985 1,464
12 Months or Longer, Gross Unrealized Losses (20) (41)
Total Fair Value 985 1,464
Total Gross Unrealized Losses (20) (41)
Debt Securities Issued by Corporations    
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months, Fair Value 171,062 24,892
Less Than 12 Months, Gross Unrealized Losses (7,201) (108)
12 Months or Longer, Fair Value 456,022 546,407
12 Months or Longer, Gross Unrealized Losses (17,951) (32,172)
Total Fair Value 627,084 571,299
Total Gross Unrealized Losses (25,152) (32,280)
Total Collateralized Mortgage Obligations    
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months, Fair Value 342,128 245,589
Less Than 12 Months, Gross Unrealized Losses (8,155) (280)
12 Months or Longer, Fair Value 741,639 801,571
12 Months or Longer, Gross Unrealized Losses (109,481) (138,542)
Total Fair Value 1,083,767 1,047,160
Total Gross Unrealized Losses (117,636) (138,822)
Residential - Government Agencies or Sponsored Enterprises    
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months, Fair Value 266,073 153,104
Less Than 12 Months, Gross Unrealized Losses (7,996) (275)
12 Months or Longer, Fair Value 591,331 673,141
12 Months or Longer, Gross Unrealized Losses (87,462) (115,126)
Total Fair Value 857,404 826,245
Total Gross Unrealized Losses (95,458) (115,401)
Commercial - Government Agencies or Sponsored Enterprises    
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months, Fair Value 71,066 92,485
Less Than 12 Months, Gross Unrealized Losses (148) (5)
12 Months or Longer, Fair Value 150,308 128,430
12 Months or Longer, Gross Unrealized Losses (22,019) (23,416)
Total Fair Value 221,374 220,915
Total Gross Unrealized Losses (22,167) (23,421)
Commercial - Non-Agency    
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months, Fair Value 4,989  
Less Than 12 Months, Gross Unrealized Losses (11)  
12 Months or Longer, Fair Value 0  
12 Months or Longer, Gross Unrealized Losses 0  
Total Fair Value 4,989  
Total Gross Unrealized Losses (11)  
Total Mortgage-Backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months, Fair Value 218,210 135
Less Than 12 Months, Gross Unrealized Losses (25,635) 0
12 Months or Longer, Fair Value 254,994 480,189
12 Months or Longer, Gross Unrealized Losses (26,400) (70,458)
Total Fair Value 473,204 480,324
Total Gross Unrealized Losses (52,035) (70,458)
Residential - Government Agencies or Sponsored Enterprises    
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months, Fair Value 218,210 135
Less Than 12 Months, Gross Unrealized Losses (25,635) 0
12 Months or Longer, Fair Value 254,994 480,189
12 Months or Longer, Gross Unrealized Losses (26,400) (70,458)
Total Fair Value 473,204 480,324
Total Gross Unrealized Losses $ (52,035) $ (70,458)