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Securities (Tables) | 6 Months Ended
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Jun. 30, 2025
Marketable Securities [Abstract] |
Trading Securities, [Table Text Block] | The fair value and net unrealized gain (loss) included in trading securities are as follows (in thousands):
|  | June 30, 2025 |  | December 31, 2024
|  | Fair Value |  | Net Unrealized Gain (Loss) |  | Fair Value |  | Net Unrealized Gain (Loss)
U.S. government securities |  | $ | 997 |  |  | $ | 2 |  |  | $ | 21,275 |  |  | $ | (60) |
Residential agency mortgage-backed securities |  | 5,450,517 |  |  | 33,768 |  |  | 4,792,695 |  |  | (37,439) |
Municipal securities |  | 64,653 |  |  | 88 |  |  | 62,230 |  |  | (566) |
Other trading securities |  | 43,250 |  |  | 299 |  |  | 22,890 |  |  | 33 |
Total trading securities |  | $ | 5,559,417 |  |  | $ | 34,157 |  |  | $ | 4,899,090 |  |  | $ | (38,032) |
Investment Securities (Held-to-Maturity) [Table Text Block] | The amortized cost and fair values of investment securities are as follows (in thousands):
|  | June 30, 2025
|  | Amortized |  | Carrying |  | Fair |  | Gross Unrealized
|  | Cost |  | Value 1 |  | Value |  | Gain |  | Loss
Municipal securities |  | $ | 91,243 |  |  | $ | 91,243 |  |  | $ | 93,080 |  |  | $ | 2,012 |  |  | $ | (175) |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |
Residential agency |  | 1,872,778 |  |  | 1,773,725 |  |  | 1,626,429 |  |  | 88 |  |  | (147,384) |
Commercial agency |  | 17,257 |  |  | 16,368 |  |  | 15,878 |  |  | — |  |  | (490) |
Other debt securities |  | 16,038 |  |  | 16,038 |  |  | 15,048 |  |  | — |  |  | (990) |
Total investment securities |  | 1,997,316 |  |  | 1,897,374 |  |  | 1,750,435 |  |  | 2,100 |  |  | (149,039) |
Allowance for credit losses |  | (196) |  |  | (196) |  |  | — |  |  | — |  |  | — |
Investment securities, net of allowance |  | $ | 1,997,120 |  |  | $ | 1,897,178 |  |  | $ | 1,750,435 |  |  | $ | 2,100 |  |  | $ | (149,039) |
1 Carrying value includes $100 million of net unrealized loss which remains in AOCI in the Consolidated Balance Sheets related to certain securities transferred during the second quarter of 2022 from the AFS securities portfolio to the investment securities portfolio.
|  | December 31, 2024
|  | Amortized |  | Carrying |  | Fair |  | Gross Unrealized
|  | Cost |  | Value 1 |  | Value |  | Gain |  | Loss
Municipal securities |  | $ | 104,467 |  |  | $ | 104,467 |  |  | $ | 106,489 |  |  | $ | 2,370 |  |  | $ | (348) |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |
Residential agency |  | 1,998,017 |  |  | 1,880,473 |  |  | 1,680,800 |  |  | 81 |  |  | (199,754) |
Commercial agency |  | 17,257 |  |  | 16,220 |  |  | 15,357 |  |  | — |  |  | (863) |
Other debt securities |  | 16,288 |  |  | 16,288 |  |  | 15,283 |  |  | — |  |  | (1,005) |
Total investment securities |  | 2,136,029 |  |  | 2,017,448 |  |  | 1,817,929 |  |  | 2,451 |  |  | (201,970) |
Allowance for credit losses |  | (223) |  |  | (223) |  |  | — |  |  | — |  |  | — |
Investment securities, net of allowance |  | $ | 2,135,806 |  |  | $ | 2,017,225 |  |  | $ | 1,817,929 |  |  | $ | 2,451 |  |  | $ | (201,970) |
1 Carrying value includes $119 million of net unrealized loss which remains in AOCI in the Consolidated Balance Sheets related to certain securities transferred during the second quarter of 2022 from the AFS securities portfolio to the investment securities portfolio. The amortized cost and fair values of investment securities at June 30, 2025, by contractual maturity, are as shown in the following table (dollars in thousands):
|  | Less than One Year |  | One to Five Years |  | Six to Ten Years |  | Over Ten Years |  | Total |  | Weighted Average Maturity 1
Fixed maturity debt securities: |  |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | $ | 47,921 |  |  | $ | 61,217 |  |  | $ | 14,498 |  |  | $ | 13 |  |  | $ | 123,649 |  |  | 2.44 |
Fair value |  | 49,239 |  |  | 61,299 |  |  | 13,455 |  |  | 13 |  |  | 124,006 |  |  |
Residential mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |
Carrying value 2 |  |  |  |  |  |  |  |  |  | $ | 1,773,725 |  |  |
Fair value |  |  |  |  |  |  |  |  |  | 1,626,429 |  |  |
Total investment securities: |  |  |  |  |  |  |  |  |  |  |  |
Carrying value |  |  |  |  |  |  |  |  |  | $ | 1,897,374 |  |  |
Fair value |  |  |  |  |  |  |  |  |  | 1,750,435 |  |  |
1 Expected maturities may differ from contractual maturities, because borrowers may have the right to call or prepay obligations with or without penalty. 2 The average expected lives of residential mortgage-backed securities were 4.4 years based upon current prepayment assumptions. Temporarily Impaired Investment Securities (Dollars in thousands):
|  | June 30, 2025
|  | Number of Securities |  | Less Than 12 Months |  | 12 Months or Longer |  | Total
|  |  | Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss
Investment: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal securities |  | 10 |  |  | $ | 5,073 |  |  | $ | 9 |  |  | $ | 6,622 |  |  | $ | 166 |  |  | $ | 11,695 |  |  | $ | 175 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential agency |  | 116 |  |  | — |  |  | — |  |  | 1,625,562 |  |  | 147,384 |  |  | 1,625,562 |  |  | 147,384 |
Commercial agency |  | 2 |  |  | — |  |  | — |  |  | 15,878 |  |  | 490 |  |  | 15,878 |  |  | 490 |
Other debt securities |  | 2 |  |  | — |  |  | — |  |  | 9,035 |  |  | 990 |  |  | 9,035 |  |  | 990 |
Total investment securities |  | 130 |  |  | $ | 5,073 |  |  | $ | 9 |  |  | $ | 1,657,097 |  |  | $ | 149,030 |  |  | $ | 1,662,170 |  |  | $ | 149,039 |
|  | December 31, 2024
|  | Number of Securities |  | Less Than 12 Months |  | 12 Months or Longer |  | Total
|  |  | Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss
Investment: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal securities |  | 20 |  |  | $ | 14,485 |  |  | $ | 65 |  |  | $ | 7,107 |  |  | $ | 283 |  |  | $ | 21,592 |  |  | $ | 348 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential agency |  | 116 |  |  | — |  |  | — |  |  | 1,679,889 |  |  | 199,754 |  |  | 1,679,889 |  |  | 199,754 |
Commercial agency |  | 2 |  |  | — |  |  | — |  |  | 15,357 |  |  | 863 |  |  | 15,357 |  |  | 863 |
Other debt securities |  | 3 |  |  | — |  |  | — |  |  | 9,271 |  |  | 1,005 |  |  | 9,271 |  |  | 1,005 |
Total investment securities |  | 141 |  |  | $ | 14,485 |  |  | $ | 65 |  |  | $ | 1,711,624 |  |  | $ | 201,905 |  |  | $ | 1,726,109 |  |  | $ | 201,970 |
Available For Sale Securities [Table Text Block] | The amortized cost and fair value of available-for-sale securities are as follows (in thousands):
|  | June 30, 2025 |  |
|  | Amortized |  | Fair |  | Gross Unrealized |  |
|  | Cost |  | Value |  | Gain |  | Loss |  |
U.S. Treasury |  | $ | 1,000 |  |  | $ | 964 |  |  | $ | — |  |  | $ | (36) |  |  |
Municipal securities |  | 218,408 |  |  | 208,350 |  |  | — |  |  | (10,058) |  |  |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |
Residential agency |  | 9,187,687 |  |  | 9,102,658 |  |  | 76,933 |  |  | (161,962) |  |  |
Residential non-agency |  | 765,088 |  |  | 743,519 |  |  | 12,070 |  |  | (33,639) |  |  |
Commercial agency |  | 3,451,816 |  |  | 3,291,857 |  |  | 5,712 |  |  | (165,671) |  |  |
Other debt securities |  | 500 |  |  | 473 |  |  | — |  |  | (27) |  |  |
Total available-for-sale securities |  | $ | 13,624,499 |  |  | $ | 13,347,821 |  |  | $ | 94,715 |  |  | $ | (371,393) |  |  |
|  | December 31, 2024 |  |
|  | Amortized |  | Fair |  | Gross Unrealized |  |
|  | Cost |  | Value |  | Gain |  | Loss |  |
U.S. Treasury |  | $ | 1,000 |  |  | $ | 945 |  |  | $ | — |  |  | $ | (55) |  |  |
Municipal securities |  | 240,528 |  |  | 225,568 |  |  | 2 |  |  | (14,962) |  |  |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |
Residential agency |  | 8,895,900 |  |  | 8,639,389 |  |  | 17,936 |  |  | (274,447) |  |  |
Residential non-agency |  | 814,542 |  |  | 781,209 |  |  | 11,247 |  |  | (44,580) |  |  |
Commercial agency |  | 3,436,465 |  |  | 3,204,016 |  |  | 726 |  |  | (233,175) |  |  |
Other debt securities |  | 500 |  |  | 473 |  |  | — |  |  | (27) |  |  |
Total available-for-sale securities |  | $ | 13,388,935 |  |  | $ | 12,851,600 |  |  | $ | 29,911 |  |  | $ | (567,246) |  |  |
The amortized cost and fair values of available-for-sale securities at June 30, 2025, by contractual maturity, are as shown in the following table (dollars in thousands):
| Less than One Year |  | One to Five Years |  | Six to Ten Years |  | Over Ten Years |  | Total |  | Weighted Average Maturity 1
Fixed maturity debt securities: |  |  |  |  |  |  |  |  |  |  |
Amortized cost | $ | 329,935 |  |  | $ | 2,432,720 |  |  | $ | 475,593 |  |  | $ | 433,476 |  |  | $ | 3,671,724 |  |  | 4.83 |
Fair value | 323,803 |  |  | 2,304,224 |  |  | 450,275 |  |  | 423,342 |  |  | 3,501,644 |  |  |
Residential mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |
Amortized cost 2 |  |  |  |  |  |  |  |  | $ | 9,952,775 |  |  |
Fair value |  |  |  |  |  |  |  |  | 9,846,177 |  |  |
Total available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |
Amortized cost |  |  |  |  |  |  |  |  | $ | 13,624,499 |  |  |
Fair value |  |  |  |  |  |  |  |  | 13,347,821 |  |  |
1 Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without penalty. 2 The average expected lives of residential mortgage-backed securities were 4.2 years based upon current prepayment assumptions. Sales of available-for-sale securities resulted in gains and losses as follows (in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Proceeds | $ | — |  |  | $ | 1,836 |  |  | $ | — |  |  | $ | 737,830 |
Gross realized gains | — |  |  | 222 |  |  | — |  |  | 455 |
Gross realized losses | — |  |  | (188) |  |  | — |  |  | (45,592) |
Related federal and state income tax expense (benefit) | — |  |  | 8 |  |  | — |  |  | (10,616) |
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table Text Block] |
|  | June 30, 2025
|  | Number of Securities |  | Less Than 12 Months |  | 12 Months or Longer |  | Total
|  |  | Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury |  | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | 964 |  |  | $ | 36 |  |  | $ | 964 |  |  | $ | 36 |
Municipal securities |  | 101 |  |  | 1,038 |  |  | 4 |  |  | 202,707 |  |  | 10,054 |  |  | 203,745 |  |  | 10,058 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential agency |  | 636 |  |  | 988,961 |  |  | 9,396 |  |  | 2,553,983 |  |  | 152,566 |  |  | 3,542,944 |  |  | 161,962 |
Residential non-agency |  | 33 |  |  | 40,245 |  |  | 162 |  |  | 439,419 |  |  | 33,477 |  |  | 479,664 |  |  | 33,639 |
Commercial agency |  | 210 |  |  | 113,235 |  |  | 992 |  |  | 2,668,153 |  |  | 164,679 |  |  | 2,781,388 |  |  | 165,671 |
Other debt securities |  | 1 |  |  | — |  |  | — |  |  | 473 |  |  | 27 |  |  | 473 |  |  | 27 |
Total available-for-sale securities |  | 982 |  |  | $ | 1,143,479 |  |  | $ | 10,554 |  |  | $ | 5,865,699 |  |  | $ | 360,839 |  |  | $ | 7,009,178 |  |  | $ | 371,393 |
|  | December 31, 2024
|  | Number of Securities |  | Less Than 12 Months |  | 12 Months or Longer |  | Total
|  |  | Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury |  | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | 945 |  |  | $ | 55 |  |  | $ | 945 |  |  | $ | 55 |
Municipal securities |  | 113 |  |  | 1,041 |  |  | 13 |  |  | 222,432 |  |  | 14,949 |  |  | 223,473 |  |  | 14,962 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential agency |  | 831 |  |  | 3,561,318 |  |  | 50,102 |  |  | 2,880,641 |  |  | 224,345 |  |  | 6,441,959 |  |  | 274,447 |
Residential non-agency |  | 36 |  |  | 93,113 |  |  | 1,124 |  |  | 457,701 |  |  | 43,456 |  |  | 550,814 |  |  | 44,580 |
Commercial agency |  | 220 |  |  | 190,718 |  |  | 1,878 |  |  | 2,819,206 |  |  | 231,297 |  |  | 3,009,924 |  |  | 233,175 |
Other debt securities |  | 1 |  |  | — |  |  | — |  |  | 473 |  |  | 27 |  |  | 473 |  |  | 27 |
Total available-for-sale securities |  | 1,202 |  |  | $ | 3,846,190 |  |  | $ | 53,117 |  |  | $ | 6,381,398 |  |  | $ | 514,129 |  |  | $ | 10,227,588 |  |  | $ | 567,246 |
Fair Value Option Securities [Table Text Block] | The fair value and net unrealized gain (loss) included in fair value option securities is as follows (in thousands):
|  | June 30, 2025 |  | December 31, 2024
|  | Fair Value |  | Net Unrealized Gain (Loss) |  | Fair Value |  | Net Unrealized Gain (Loss)
Residential agency mortgage-backed securities |  | $ | 107,702 |  |  | $ | (225) |  |  | $ | 17,876 |  |  | $ | (1,662) |

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