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Investment Securities - Schedule of AFS Debt Securities in an Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months, Fair Value $ 326,215 $ 309,470
Less Than 12 Months, Gross Unrealized Losses (856) (676)
12 Months or Longer, Fair Value 2,007,710 2,050,731
12 Months or Longer, Gross Unrealized Losses (187,266) (258,459)
Total Fair Value 2,333,925 2,360,201
Total Gross Unrealized Losses (188,122) (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 61,949 38,854
Less Than 12 Months, Gross Unrealized Losses (248) (288)
12 Months or Longer, Fair Value 142,395 157,456
12 Months or Longer, Gross Unrealized Losses (4,033) (7,897)
Total Fair Value 204,344 196,310
Total Gross Unrealized Losses (4,281) (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 65,905 63,644
12 Months or Longer, Gross Unrealized Losses (6,393) (9,349)
Total Fair Value 65,905 63,644
Total Gross Unrealized Losses (6,393) (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 992 1,464
12 Months or Longer, Gross Unrealized Losses (13) (41)
Total Fair Value 992 1,464
Total Gross Unrealized Losses (13) (41)
Debt Securities Issued by Corporations    
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months, Fair Value 74,824 24,892
Less Than 12 Months, Gross Unrealized Losses (176) (108)
12 Months or Longer, Fair Value 555,825 546,407
12 Months or Longer, Gross Unrealized Losses (21,301) (32,172)
Total Fair Value 630,649 571,299
Total Gross Unrealized Losses (21,477) (32,280)
Total Collateralized Mortgage Obligations    
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months, Fair Value 189,442 245,589
Less Than 12 Months, Gross Unrealized Losses (432) (280)
12 Months or Longer, Fair Value 797,967 801,571
12 Months or Longer, Gross Unrealized Losses (108,399) (138,542)
Total Fair Value 987,409 1,047,160
Total Gross Unrealized Losses (108,831) (138,822)
Residential - Government Agencies or Sponsored Enterprises    
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months, Fair Value 83,117 153,104
Less Than 12 Months, Gross Unrealized Losses (227) (275)
12 Months or Longer, Fair Value 624,852 673,141
12 Months or Longer, Gross Unrealized Losses (87,016) (115,126)
Total Fair Value 707,969 826,245
Total Gross Unrealized Losses (87,243) (115,401)
Commercial - Government Agencies or Sponsored Enterprises    
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months, Fair Value 76,777 92,485
Less Than 12 Months, Gross Unrealized Losses (78) (5)
12 Months or Longer, Fair Value 173,115 128,430
12 Months or Longer, Gross Unrealized Losses (21,383) (23,416)
Total Fair Value 249,892 220,915
Total Gross Unrealized Losses (21,461) (23,421)
Commercial - Non-Agency    
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months, Fair Value 29,548  
Less Than 12 Months, Gross Unrealized Losses (127)  
12 Months or Longer, Fair Value 0  
12 Months or Longer, Gross Unrealized Losses 0  
Total Fair Value 29,548  
Total Gross Unrealized Losses (127)  
Total Mortgage-Backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months, Fair Value 0 135
Less Than 12 Months, Gross Unrealized Losses 0 0
12 Months or Longer, Fair Value 444,626 480,189
12 Months or Longer, Gross Unrealized Losses (47,127) (70,458)
Total Fair Value 444,626 480,324
Total Gross Unrealized Losses (47,127) (70,458)
Residential - Government Agencies or Sponsored Enterprises    
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months, Fair Value 0 135
Less Than 12 Months, Gross Unrealized Losses 0 0
12 Months or Longer, Fair Value 444,626 480,189
12 Months or Longer, Gross Unrealized Losses (47,127) (70,458)
Total Fair Value 444,626 480,324
Total Gross Unrealized Losses $ (47,127) $ (70,458)