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Investment Securities (Securities With Unrealized Losses And Length Of Impairment Period) (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 months $ 1,443,027 $ 659,636
Unrealized Loss, Less than 12 months 9,633 2,704
Fair Value, Greater than 12 months 4,904,458 5,222,367
Unrealized Loss, Greater than 12 months 701,810 689,390
Debt Securities, Available-for-sale, Unrealized Loss Position 6,347,485 5,882,003
Unrealized Loss on AFS Debt Securities 711,443 692,094
U.S. government and federal agency obligations    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 months 1,321,452 612,167
Unrealized Loss, Less than 12 months 9,277 2,620
Fair Value, Greater than 12 months 190,275 314,006
Unrealized Loss, Greater than 12 months 7,123 8,244
Debt Securities, Available-for-sale, Unrealized Loss Position 1,511,727 926,173
Unrealized Loss on AFS Debt Securities 16,400 10,864
Government-sponsored enterprise obligations    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 months 0 0
Unrealized Loss, Less than 12 months 0 0
Fair Value, Greater than 12 months 43,985 44,712
Unrealized Loss, Greater than 12 months 10,614 10,239
Debt Securities, Available-for-sale, Unrealized Loss Position 43,985 44,712
Unrealized Loss on AFS Debt Securities 10,614 10,239
State and municipal obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 months 30,515 12,157
Unrealized Loss, Less than 12 months 118 18
Fair Value, Greater than 12 months 614,192 636,492
Unrealized Loss, Greater than 12 months 50,935 50,323
Debt Securities, Available-for-sale, Unrealized Loss Position 644,707 648,649
Unrealized Loss on AFS Debt Securities 51,053 50,341
Agency mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 months 3,670 2,437
Unrealized Loss, Less than 12 months 47 30
Fair Value, Greater than 12 months 3,047,265 3,148,627
Unrealized Loss, Greater than 12 months 578,793 565,056
Debt Securities, Available-for-sale, Unrealized Loss Position 3,050,935 3,151,064
Unrealized Loss on AFS Debt Securities 578,840 565,086
Non-Agency Mortgage-Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 months 0 0
Unrealized Loss, Less than 12 months 0 0
Fair Value, Greater than 12 months 401,037 421,508
Unrealized Loss, Greater than 12 months 31,665 31,942
Debt Securities, Available-for-sale, Unrealized Loss Position 401,037 421,508
Unrealized Loss on AFS Debt Securities 31,665 31,942
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 months 68,558 32,875
Unrealized Loss, Less than 12 months 181 36
Fair Value, Greater than 12 months 514,421 546,984
Unrealized Loss, Greater than 12 months 16,102 16,925
Debt Securities, Available-for-sale, Unrealized Loss Position 582,979 579,859
Unrealized Loss on AFS Debt Securities 16,283 16,961
Total Mortgage And Asset-Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 months 72,228 35,312
Unrealized Loss, Less than 12 months 228 66
Fair Value, Greater than 12 months 3,962,723 4,117,119
Unrealized Loss, Greater than 12 months 626,560 613,923
Debt Securities, Available-for-sale, Unrealized Loss Position 4,034,951 4,152,431
Unrealized Loss on AFS Debt Securities 626,788 613,989
Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 months 18,832 0
Unrealized Loss, Less than 12 months 10 0
Fair Value, Greater than 12 months 93,283 110,038
Unrealized Loss, Greater than 12 months 6,578 6,661
Debt Securities, Available-for-sale, Unrealized Loss Position 112,115 110,038
Unrealized Loss on AFS Debt Securities $ 6,588 $ 6,661