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Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Schedule of Held-to-maturity Securities [Line Items]    
Held to Maturity, Losses less than 12 months, Fair Value $ 110,224 $ 98,559
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses 329 97
Held to Maturity, Losses 12 months or longer, Fair Value 1,625,308 1,808,602
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses 125,211 122,715
Held To Maturity Securities Unrealized Loss Position Fair Value, Total 1,735,532 1,907,161
Held to Maturity, Total, Gross Unrealized Losses 125,540 122,812
U.S. Treasury And Government Agency Securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Held to Maturity, Losses less than 12 months, Fair Value 8,563 0
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses 24 0
Held to Maturity, Losses 12 months or longer, Fair Value 313,146 316,814
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses 29,147 30,143
Held To Maturity Securities Unrealized Loss Position Fair Value, Total 321,709 316,814
Held to Maturity, Total, Gross Unrealized Losses 29,171 30,143
Municipal Obligations [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Held to Maturity, Losses less than 12 months, Fair Value 101,661 98,559
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses 305 97
Held to Maturity, Losses 12 months or longer, Fair Value 171,360 325,241
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses 11,251 11,358
Held To Maturity Securities Unrealized Loss Position Fair Value, Total 273,021 423,800
Held to Maturity, Total, Gross Unrealized Losses 11,556 11,455
Residential Mortgage-Backed Securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Held to Maturity, Losses less than 12 months, Fair Value 0 0
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses 0 0
Held to Maturity, Losses 12 months or longer, Fair Value 444,485 463,099
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses 35,764 34,239
Held To Maturity Securities Unrealized Loss Position Fair Value, Total 444,485 463,099
Held to Maturity, Total, Gross Unrealized Losses 35,764 34,239
Commercial Mortgage-Backed Securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Held to Maturity, Losses less than 12 months, Fair Value 0 0
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses 0 0
Held to Maturity, Losses 12 months or longer, Fair Value 679,494 684,874
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses 48,510 46,455
Held To Maturity Securities Unrealized Loss Position Fair Value, Total 679,494 684,874
Held to Maturity, Total, Gross Unrealized Losses 48,510 46,455
Collateralized Mortgage Obligations [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Held to Maturity, Losses less than 12 months, Fair Value 0 0
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses 0 0
Held to Maturity, Losses 12 months or longer, Fair Value 16,823 18,574
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses 539 520
Held To Maturity Securities Unrealized Loss Position Fair Value, Total 16,823 18,574
Held to Maturity, Total, Gross Unrealized Losses $ 539 $ 520