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Securities (Amortized Cost and Fair Value of Debt Securities Held to Maturity) (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Schedule of Held-to-maturity Securities [Line Items]    
Securities Held to Maturity, Gross Amortized Cost $ 2,051,628 $ 2,132,882
Securities Held to Maturity, Gross Unrealized Gains 641 956
Securities Held to Maturity, Gross Unrealized Losses 125,540 122,812
Securities Held to Maturity, Fair Value 1,926,729 2,011,026
U.S. Treasury And Government Agency Securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Securities Held to Maturity, Gross Amortized Cost 368,667 373,605
Securities Held to Maturity, Gross Unrealized Gains 271 248
Securities Held to Maturity, Gross Unrealized Losses 29,171 30,143
Securities Held to Maturity, Fair Value 339,767 343,710
Municipal Obligations [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Securities Held to Maturity, Gross Amortized Cost 457,346 511,516
Securities Held to Maturity, Gross Unrealized Gains 370 708
Securities Held to Maturity, Gross Unrealized Losses 11,556 11,455
Securities Held to Maturity, Fair Value 446,160 500,769
Residential Mortgage-Backed Securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Securities Held to Maturity, Gross Amortized Cost 480,249 497,338
Securities Held to Maturity, Gross Unrealized Losses 35,764 34,239
Securities Held to Maturity, Fair Value 444,485 463,099
Commercial Mortgage-Backed Securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Securities Held to Maturity, Gross Amortized Cost 728,004 731,329
Securities Held to Maturity, Gross Unrealized Losses 48,510 46,455
Securities Held to Maturity, Fair Value 679,494 684,874
Collateralized Mortgage Obligations [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Securities Held to Maturity, Gross Amortized Cost 17,362 19,094
Securities Held to Maturity, Gross Unrealized Losses 539 520
Securities Held to Maturity, Fair Value $ 16,823 $ 18,574