v3.25.2
Investment Securities (Securities With Unrealized Losses And Length Of Impairment Period) (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 months $ 840,685 $ 1,757,431
Unrealized Loss, Less than 12 months 4,977 27,884
Fair Value, Greater than 12 months 5,621,533 6,377,480
Unrealized Loss, Greater than 12 months 791,327 966,650
Debt Securities, Available-for-sale, Unrealized Loss Position 6,462,218 8,134,911
Unrealized Loss on AFS Debt Securities 796,304 994,534
U.S. government and federal agency obligations    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 months 690,639 1,492,875
Unrealized Loss, Less than 12 months 4,040 24,662
Fair Value, Greater than 12 months 291,903 353,129
Unrealized Loss, Greater than 12 months 8,709 17,197
Debt Securities, Available-for-sale, Unrealized Loss Position 982,542 1,846,004
Unrealized Loss on AFS Debt Securities 12,749 41,859
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 44,148 42,848
Unrealized Loss, Greater than 12 months 10,884 12,576
Debt Securities, Available-for-sale, Unrealized Loss Position 44,148 42,848
Unrealized Loss on AFS Debt Securities 10,884 12,576
State and municipal obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 months 10,292 14,860
Unrealized Loss, Less than 12 months 272 230
Fair Value, Greater than 12 months 690,932 724,587
Unrealized Loss, Greater than 12 months 59,513 79,685
Debt Securities, Available-for-sale, Unrealized Loss Position 701,224 739,447
Unrealized Loss on AFS Debt Securities 59,785 79,915
Agency mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 months 1,964 3,882
Unrealized Loss, Less than 12 months 16 42
Fair Value, Greater than 12 months 3,308,242 3,409,405
Unrealized Loss, Greater than 12 months 636,145 750,664
Debt Securities, Available-for-sale, Unrealized Loss Position 3,310,206 3,413,287
Unrealized Loss on AFS Debt Securities 636,161 750,706
Non-Agency Mortgage-Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 months 0 10
Unrealized Loss, Less than 12 months 0 0
Fair Value, Greater than 12 months 454,609 564,637
Unrealized Loss, Greater than 12 months 40,278 56,986
Debt Securities, Available-for-sale, Unrealized Loss Position 454,609 564,647
Unrealized Loss on AFS Debt Securities 40,278 56,986
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 months 110,990 219,414
Unrealized Loss, Less than 12 months 479 2,371
Fair Value, Greater than 12 months 701,808 1,083,938
Unrealized Loss, Greater than 12 months 26,682 36,824
Debt Securities, Available-for-sale, Unrealized Loss Position 812,798 1,303,352
Unrealized Loss on AFS Debt Securities 27,161 39,195
Total Mortgage And Asset-Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 months 112,954 223,306
Unrealized Loss, Less than 12 months 495 2,413
Fair Value, Greater than 12 months 4,464,659 5,057,980
Unrealized Loss, Greater than 12 months 703,105 844,474
Debt Securities, Available-for-sale, Unrealized Loss Position 4,577,613 5,281,286
Unrealized Loss on AFS Debt Securities 703,600 846,887
Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 months 26,800 26,390
Unrealized Loss, Less than 12 months 170 579
Fair Value, Greater than 12 months 129,891 198,936
Unrealized Loss, Greater than 12 months 9,116 12,718
Debt Securities, Available-for-sale, Unrealized Loss Position 156,691 225,326
Unrealized Loss on AFS Debt Securities $ 9,286 $ 13,297