v3.26.3
Investment Securities (Schedule of the Aggregate Fair Value and Amount by which Amortized Cost Exceeds Fair Value for Investment Securities that are in Unrealized Loss Positions) (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Fair Value    
Less than 12 Months $ 3,709,378 $ 602,274
12 Months or Greater 2,621,355 3,770,668
Total 6,330,733 4,372,942
Unrealized Losses    
Less than 12 Months (103,296) (2,463)
12 Months or Greater (357,524) (291,388)
Total (460,820) (293,851)
U.S. Treasury securities    
Fair Value    
Less than 12 Months 235,503 125,467
12 Months or Greater 65,162 97,812
Total 300,665 223,279
Unrealized Losses    
Less than 12 Months (17,590) (825)
12 Months or Greater (9,775) (7,018)
Total (27,365) (7,843)
U.S. Government agency and sponsored enterprise residential MBS    
Fair Value    
Less than 12 Months 1,470,764 128,974
12 Months or Greater 190,194 637,536
Total 1,660,958 766,510
Unrealized Losses    
Less than 12 Months (38,142) (471)
12 Months or Greater (9,217) (15,207)
Total (47,359) (15,678)
U.S. Government agency and sponsored enterprise commercial MBS    
Fair Value    
Less than 12 Months 377,295 36,046
12 Months or Greater 331,365 384,952
Total 708,660 420,998
Unrealized Losses    
Less than 12 Months (20,256) (140)
12 Months or Greater (52,524) (42,767)
Total (72,780) (42,907)
Private label residential MBS and CMOs    
Fair Value    
Less than 12 Months 894,147 83,348
12 Months or Greater 1,664,295 1,897,018
Total 2,558,442 1,980,366
Unrealized Losses    
Less than 12 Months (19,226) (101)
12 Months or Greater (251,546) (195,457)
Total (270,772) (195,558)
Private label commercial MBS    
Fair Value    
Less than 12 Months 227,492 134,630
12 Months or Greater 206,467 424,672
Total 433,959 559,302
Unrealized Losses    
Less than 12 Months (6,797) (134)
12 Months or Greater (22,457) (19,757)
Total (29,254) (19,891)
Single family real estate-backed securities    
Fair Value    
Less than 12 Months 29,839 0
12 Months or Greater 0 151,818
Total 29,839 151,818
Unrealized Losses    
Less than 12 Months (25) 0
12 Months or Greater 0 (1,977)
Total (25) (1,977)
Collateralized loan obligations    
Fair Value    
Less than 12 Months 413,289 37,511
12 Months or Greater 64,689 60,791
Total 477,978 98,302
Unrealized Losses    
Less than 12 Months (376) (305)
12 Months or Greater (514) (913)
Total (890) (1,218)
Non-mortgage asset-backed securities    
Fair Value    
Less than 12 Months 44,049 44,173
12 Months or Greater 11,285 14,592
Total 55,334 58,765
Unrealized Losses    
Less than 12 Months (422) (298)
12 Months or Greater (551) (879)
Total (973) (1,177)
State and municipal obligations    
Fair Value    
Less than 12 Months 17,000 12,125
12 Months or Greater 46,715 47,255
Total 63,715 59,380
Unrealized Losses    
Less than 12 Months (462) (189)
12 Months or Greater (9,876) (5,676)
Total (10,338) (5,865)
SBA securities    
Fair Value    
Less than 12 Months 0 0
12 Months or Greater 41,183 54,222
Total 41,183 54,222
Unrealized Losses    
Less than 12 Months 0 0
12 Months or Greater (1,064) (1,737)
Total $ (1,064) $ (1,737)