v3.26.1
Investment Securities (Securities With Unrealized Losses And Length Of Impairment Period) (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 months $ 2,355,607 $ 659,636
Unrealized Loss, Less than 12 months 21,198 2,704
Fair Value, Greater than 12 months 4,144,828 5,222,367
Unrealized Loss, Greater than 12 months 608,316 689,390
Debt Securities, Available-for-sale, Unrealized Loss Position 6,500,435 5,882,003
Unrealized Loss on AFS Debt Securities 629,514 692,094
U.S. government and federal agency obligations    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 months 2,177,177 612,167
Unrealized Loss, Less than 12 months 20,642 2,620
Fair Value, Greater than 12 months 72,263 314,006
Unrealized Loss, Greater than 12 months 2,188 8,244
Debt Securities, Available-for-sale, Unrealized Loss Position 2,249,440 926,173
Unrealized Loss on AFS Debt Securities 22,830 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 43,849 44,712
Unrealized Loss, Greater than 12 months 10,742 10,239
Debt Securities, Available-for-sale, Unrealized Loss Position 43,849 44,712
Unrealized Loss on AFS Debt Securities 10,742 10,239
State and municipal obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 months 9,609 12,157
Unrealized Loss, Less than 12 months 54 18
Fair Value, Greater than 12 months 599,340 636,492
Unrealized Loss, Greater than 12 months 49,729 50,323
Debt Securities, Available-for-sale, Unrealized Loss Position 608,949 648,649
Unrealized Loss on AFS Debt Securities 49,783 50,341
Agency mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 months 3,271 2,437
Unrealized Loss, Less than 12 months 59 30
Fair Value, Greater than 12 months 2,530,076 3,148,627
Unrealized Loss, Greater than 12 months 494,281 565,056
Debt Securities, Available-for-sale, Unrealized Loss Position 2,533,347 3,151,064
Unrealized Loss on AFS Debt Securities 494,340 565,086
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 371,851 421,508
Unrealized Loss, Greater than 12 months 31,121 31,942
Debt Securities, Available-for-sale, Unrealized Loss Position 371,851 421,508
Unrealized Loss on AFS Debt Securities 31,121 31,942
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 months 140,296 32,875
Unrealized Loss, Less than 12 months 274 36
Fair Value, Greater than 12 months 439,328 546,984
Unrealized Loss, Greater than 12 months 13,998 16,925
Debt Securities, Available-for-sale, Unrealized Loss Position 579,624 579,859
Unrealized Loss on AFS Debt Securities 14,272 16,961
Total Mortgage And Asset-Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 months 143,567 35,312
Unrealized Loss, Less than 12 months 333 66
Fair Value, Greater than 12 months 3,341,255 4,117,119
Unrealized Loss, Greater than 12 months 539,400 613,923
Debt Securities, Available-for-sale, Unrealized Loss Position 3,484,822 4,152,431
Unrealized Loss on AFS Debt Securities 539,733 613,989
Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 months 25,254 0
Unrealized Loss, Less than 12 months 169 0
Fair Value, Greater than 12 months 88,121 110,038
Unrealized Loss, Greater than 12 months 6,257 6,661
Debt Securities, Available-for-sale, Unrealized Loss Position 113,375 110,038
Unrealized Loss on AFS Debt Securities $ 6,426 $ 6,661