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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, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 524,886 $ 1,622,289
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 1,940 11,807
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 4,011,804 5,115,305
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 310,477 402,194
Debt Securities, Available-for-sale, Unrealized Loss Position 4,536,690 6,737,594
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 312,417 414,001
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 25,205 126,710
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 219 3,195
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 97,412 40,791
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 7,406 8,814
Debt Securities, Available-for-sale, Unrealized Loss Position 122,617 167,501
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 7,625 12,009
U.S. Government agency and sponsored enterprise residential MBS    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 86,533 895,759
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 557 5,474
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 734,596 936,106
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 15,841 20,997
Debt Securities, Available-for-sale, Unrealized Loss Position 821,129 1,831,865
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 16,398 26,471
U.S. Government agency and sponsored enterprise commercial MBS    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 24,643 55,431
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 116 1,545
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 438,933 394,735
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 44,916 60,347
Debt Securities, Available-for-sale, Unrealized Loss Position 463,576 450,166
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 45,032 61,892
Private label residential MBS and CMOs    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 18,006 147,700
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 197 954
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,943,761 2,040,335
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 209,000 252,539
Debt Securities, Available-for-sale, Unrealized Loss Position 1,961,767 2,188,035
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 209,197 253,493
Private label commercial MBS    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 182,380 44,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 392 302
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 488,270 1,199,150
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 21,929 40,386
Debt Securities, Available-for-sale, Unrealized Loss Position 670,650 1,243,150
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 22,321 40,688
Single family real estate-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 0 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 0 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 152,836 301,973
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 2,541 8,074
Debt Securities, Available-for-sale, Unrealized Loss Position 152,836 301,973
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 2,541 8,074
Collateralized loan obligations    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 186,929 336,924
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 454 189
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 30,402 7,726
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 98 4
Debt Securities, Available-for-sale, Unrealized Loss Position 217,331 344,650
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 552 193
Non-mortgage asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 0 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 0 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 15,678 71,789
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 1,062 2,555
Debt Securities, Available-for-sale, Unrealized Loss Position 15,678 71,789
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 1,062 2,555
State and municipal obligations    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 1,190 15,765
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 5 148
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 51,780 54,820
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 5,889 6,243
Debt Securities, Available-for-sale, Unrealized Loss Position 52,970 70,585
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 5,894 6,391
SBA securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 0 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 0 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 58,136 67,880
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 1,795 2,235
Debt Securities, Available-for-sale, Unrealized Loss Position 58,136 67,880
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ 1,795 $ 2,235