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Securities (Amortized Cost and Fair Value of Debt Securities Available for Sale) (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Debt Securities, Available-for-Sale [Line Items]    
Securities Available for Sale, Amortized Cost $ 6,341,322 $ 5,774,133
Securities Available for Sale, Gross Unrealized Gains 25,997 3,030
Securities Available for Sale, Gross Unrealized Losses 405,402 615,672
Securities Available for Sale, Fair Value 5,961,917 5,161,491
U.S. Treasury And Government Agency Securities [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Securities Available for Sale, Amortized Cost 266,825 185,827
Securities Available for Sale, Gross Unrealized Gains 3,705 349
Securities Available for Sale, Gross Unrealized Losses 1,198 3,894
Securities Available for Sale, Fair Value 269,332 182,282
Municipal Obligations [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Securities Available for Sale, Amortized Cost 191,754 200,272
Securities Available for Sale, Gross Unrealized Gains 82 0
Securities Available for Sale, Gross Unrealized Losses 508 3,942
Securities Available for Sale, Fair Value 191,328 196,330
Residential Mortgage-Backed Securities [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Securities Available for Sale, Amortized Cost 2,620,980 2,482,109
Securities Available for Sale, Gross Unrealized Gains 11,643 496
Securities Available for Sale, Gross Unrealized Losses 256,994 353,554
Securities Available for Sale, Fair Value 2,375,629 2,129,051
Commercial Mortgage-Backed Securities [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Securities Available for Sale, Amortized Cost 3,217,663 2,849,372
Securities Available for Sale, Gross Unrealized Gains 10,530 2,185
Securities Available for Sale, Gross Unrealized Losses 144,868 250,592
Securities Available for Sale, Fair Value 3,083,325 2,600,965
Collateralized Mortgage Obligations [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Securities Available for Sale, Amortized Cost 27,100 37,553
Securities Available for Sale, Gross Unrealized Losses 1,154 2,306
Securities Available for Sale, Fair Value 25,946 35,247
Corporate Debt Securities [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Securities Available for Sale, Amortized Cost 17,000 19,000
Securities Available for Sale, Gross Unrealized Gains 37  
Securities Available for Sale, Gross Unrealized Losses 680 1,384
Securities Available for Sale, Fair Value $ 16,357 $ 17,616