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Securities (Amortized Cost and Fair Value of Debt Securities Available for Sale) (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Debt Securities, Available-for-Sale [Line Items]    
Securities Available for Sale, Amortized Cost $ 6,287,446 $ 6,341,322
Securities Available for Sale, Gross Unrealized Gains 17,322 25,997
Securities Available for Sale, Gross Unrealized Losses 328,382 405,402
Securities Available for Sale, Fair Value 5,976,386 5,961,917
U.S. Treasury And Government Agency Securities [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Securities Available for Sale, Amortized Cost 279,080 266,825
Securities Available for Sale, Gross Unrealized Gains 4,562 3,705
Securities Available for Sale, Gross Unrealized Losses 1,175 1,198
Securities Available for Sale, Fair Value 282,467 269,332
Municipal Obligations [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Securities Available for Sale, Amortized Cost 180,786 191,754
Securities Available for Sale, Gross Unrealized Gains 49 82
Securities Available for Sale, Gross Unrealized Losses 692 508
Securities Available for Sale, Fair Value 180,143 191,328
Residential Mortgage-Backed Securities [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Securities Available for Sale, Amortized Cost 2,567,467 2,620,980
Securities Available for Sale, Gross Unrealized Gains 6,254 11,643
Securities Available for Sale, Gross Unrealized Losses 240,316 256,994
Securities Available for Sale, Fair Value 2,333,405 2,375,629
Commercial Mortgage-Backed Securities [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Securities Available for Sale, Amortized Cost 3,218,115 3,217,663
Securities Available for Sale, Gross Unrealized Gains 6,457 10,530
Securities Available for Sale, Gross Unrealized Losses 84,252 144,868
Securities Available for Sale, Fair Value 3,140,320 3,083,325
Collateralized Mortgage Obligations [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Securities Available for Sale, Amortized Cost 24,998 27,100
Securities Available for Sale, Gross Unrealized Losses 1,184 1,154
Securities Available for Sale, Fair Value 23,814 25,946
Corporate Debt Securities [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Securities Available for Sale, Amortized Cost 17,000 17,000
Securities Available for Sale, Gross Unrealized Gains   37
Securities Available for Sale, Gross Unrealized Losses 763 680
Securities Available for Sale, Fair Value $ 16,237 $ 16,357