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Securities (Tables) | 6 Months Ended
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Jun. 30, 2022
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, 2022 |  | December 31, 2021
|  | Fair Value |  | Net Unrealized Gain (Loss) |  | Fair Value |  | Net Unrealized Gain (Loss)
U.S. government securities |  | $ | 8,357 |  |  | $ | — |  |  | $ | 23,610 |  |  | $ | 40 |
Residential agency mortgage-backed securities |  | 2,807,950 |  |  | (20,447) |  |  | 9,068,900 |  |  | (9,338) |
Municipal securities |  | 18,825 |  |  | (11) |  |  | 25,783 |  |  | 34 |
Other trading securities |  | 24,312 |  |  | (9) |  |  | 18,520 |  |  | (26) |
Total trading securities |  | $ | 2,859,444 |  |  | $ | (20,467) |  |  | $ | 9,136,813 |  |  | $ | (9,290) |
Investment Securities (Held-to-Maturity) [Table Text Block] | The amortized cost and fair values of investment securities are as follows (in thousands):
|  | June 30, 2022
|  | Amortized |  | Carrying |  | Fair |  | Gross Unrealized
|  | Cost |  | Value 1 |  | Value |  | Gain |  | Loss
Municipal securities |  | $ | 175,974 |  |  | $ | 175,974 |  |  | $ | 180,783 |  |  | $ | 5,819 |  |  | $ | (1,010) |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |
Residential agency |  | 2,709,094 |  |  | 2,445,845 |  |  | 2,410,926 |  |  | 272 |  |  | (35,191) |
Commercial agency |  | 17,260 |  |  | 15,455 |  |  | 15,279 |  |  | — |  |  | (176) |
Other debt securities |  | 788 |  |  | 788 |  |  | 769 |  |  | — |  |  | (19) |
Total investment securities |  | 2,903,116 |  |  | 2,638,062 |  |  | 2,607,757 |  |  | 6,091 |  |  | (36,396) |
Allowance for credit losses |  | (717) |  |  | (717) |  |  |  |  |  |  |
Investment securities, net of allowance |  | $ | 2,902,399 |  |  | $ | 2,637,345 |  |  | $ | 2,607,757 |  |  | $ | 6,091 |  |  | $ | (36,396) |
1 Carrying value includes $265 million of net unrealized loss which remains in Accumulated other comprehensive income ("AOCI") in the Consolidated Balance Sheets related to certain securities transferred from the Available for Sale securities portfolio to the Investment securities portfolio as discussed in greater detail following.
|  | December 31, 2021
|  | Amortized |  | Carrying |  | Fair |  | Gross Unrealized
|  | Cost |  | Value |  | Value |  | Gain |  | Loss
Municipal securities |  | $ | 203,772 |  |  | $ | 203,772 |  |  | $ | 223,609 |  |  | $ | 19,851 |  |  | $ | (14) |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |
Residential agency |  | 6,939 |  |  | 6,939 |  |  | 7,500 |  |  | 561 |  |  | — |
Other debt securities |  | 288 |  |  | 288 |  |  | 286 |  |  | — |  |  | (2) |
Total investment securities |  | 210,999 |  |  | 210,999 |  |  | 231,395 |  |  | 20,412 |  |  | (16) |
Allowance for credit losses |  | (555) |  |  | (555) |  |  |  |  |  |  |
Investment securities, net of allowance |  | $ | 210,444 |  |  | $ | 210,444 |  |  | $ | 231,395 |  |  | $ | 20,412 |  |  | $ | (16) |
During the three months ended June 30, 2022, the Company transferred certain U.S. government agency mortgage-backed securities from the available for sale portfolio to the investment securities portfolio (held-to-maturity) as the Company has the positive intent and ability to hold these securities to maturity. No gains or losses were recognized in the Consolidated Statements of Earnings at the time of the transfer. Transfers of debt securities into the investment securities portfolio (held-to-maturity) are made at fair value at the date of transfer. The unrealized holding gain or loss at the date of transfer is retained in accumulated other comprehensive income and in the carrying value of the investment securities portfolio. Such amounts are amortized over the estimated life of the security as an adjustment to yield, offsetting the related amortization of the premium or accretion of the discount on the transferred securities. At the time of transfer, the fair value totaled $2.4 billion, amortized cost totaled $2.7 billion and the pretax unrealized loss totaled $268 million. The amortized cost and fair values of investment securities at June 30, 2022, 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 |  | $ | 14,890 |  |  | $ | 105,177 |  |  | $ | 67,111 |  |  | $ | 5,039 |  |  | $ | 192,217 |  |  | 4.49 |
Fair value |  | 15,018 |  |  | 110,157 |  |  | 66,625 |  |  | 5,031 |  |  | 196,831 |  |  |
Residential mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |
Carrying value |  |  |  |  |  |  |  |  |  | $ | 2,445,845 |  |  | 2
Fair value |  |  |  |  |  |  |  |  |  | 2,410,926 |  |  |
Total investment securities: |  |  |  |  |  |  |  |  |  |  |  |
Carrying value |  |  |  |  |  |  |  |  |  | $ | 2,638,062 |  |  |
Fair value |  |  |  |  |  |  |  |  |  | 2,607,757 |  |  |
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 5.4 years based upon current prepayment assumptions. Temporarily Impaired Investment Securities (in thousands):
|  | June 30, 2022
|  | 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 |  | 56 |  |  | $ | 27,968 |  |  | $ | 935 |  |  | $ | 527 |  |  | $ | 75 |  |  | $ | 28,495 |  |  | $ | 1,010 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential agency |  | 115 |  |  | 2,408,180 |  |  | 35,191 |  |  | — |  |  | — |  |  | 2,408,180 |  |  | 35,191 |
Commercial agency |  | 2 |  |  | 15,279 |  |  | 176 |  |  | — |  |  | — |  |  | 15,279 |  |  | 176 |
Other debt securities |  | 2 |  |  | 234 |  |  | 17 |  |  | 23 |  |  | 2 |  |  | 257 |  |  | 19 |
Total investment securities |  | 175 |  |  | $ | 2,451,661 |  |  | $ | 36,319 |  |  | $ | 550 |  |  | $ | 77 |  |  | $ | 2,452,211 |  |  | $ | 36,396 |
|  | December 31, 2021
|  | 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 |  | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | 587 |  |  | $ | 14 |  |  | $ | 587 |  |  | $ | 14 |
Other debt securities |  | 2 |  |  | 273 |  |  | 2 |  |  | — |  |  | — |  |  | 273 |  |  | 2 |
Total investment securities |  | 3 |  |  | $ | 273 |  |  | $ | 2 |  |  | $ | 587 |  |  | $ | 14 |  |  | $ | 860 |  |  | $ | 16 |
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, 2022 |  |
|  | Amortized |  | Fair |  | Gross Unrealized |  |
|  | Cost |  | Value |  | Gain |  | Loss |  |
U.S. Treasury |  | $ | 1,000 |  |  | $ | 927 |  |  | $ | — |  |  | $ | (73) |  |  |
Municipal securities |  | 686,224 |  |  | 638,305 |  |  | 1,039 |  |  | (48,958) |  |  |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |
Residential agency |  | 5,088,155 |  |  | 4,913,245 |  |  | 2,309 |  |  | (177,219) |  |  |
Residential non-agency |  | 530,947 |  |  | 519,613 |  |  | 11,784 |  |  | (23,118) |  |  |
Commercial agency |  | 4,368,649 |  |  | 4,080,101 |  |  | 61 |  |  | (288,609) |  |  |
Other debt securities |  | 500 |  |  | 472 |  |  | — |  |  | (28) |  |  |
Total available for sale securities |  | $ | 10,675,475 |  |  | $ | 10,152,663 |  |  | $ | 15,193 |  |  | $ | (538,005) |  |  |
|  | December 31, 2021 |  |
|  | Amortized |  | Fair |  | Gross Unrealized |  |
|  | Cost |  | Value |  | Gain |  | Loss |  |
U.S. Treasury |  | $ | 1,001 |  |  | $ | 1,000 |  |  | $ | — |  |  | $ | (1) |  |  |
Municipal securities |  | 515,551 |  |  | 508,365 |  |  | 1,302 |  |  | (8,488) |  |  |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |
Residential agency |  | 7,908,587 |  |  | 8,006,616 |  |  | 155,477 |  |  | (57,448) |  |  |
Residential non-agency |  | 10,625 |  |  | 24,339 |  |  | 13,714 |  |  | — |  |  |
Commercial agency |  | 4,628,172 |  |  | 4,617,025 |  |  | 36,868 |  |  | (48,015) |  |  |
Other debt securities |  | 500 |  |  | 472 |  |  | — |  |  | (28) |  |  |
Total available for sale securities |  | $ | 13,064,436 |  |  | $ | 13,157,817 |  |  | $ | 207,361 |  |  | $ | (113,980) |  |  |
The amortized cost and fair values of available for sale securities at June 30, 2022, 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 | $ | 46,384 |  |  | $ | 1,994,203 |  |  | $ | 2,546,615 |  |  | $ | 469,171 |  |  | $ | 5,056,373 |  |  | 6.42 |
Fair value | 46,421 |  |  | 1,911,712 |  |  | 2,317,565 |  |  | 444,287 |  |  | 4,719,805 |  |  |
Residential mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |
Amortized cost |  |  |  |  |  |  |  |  | $ | 5,619,102 |  |  | 2
Fair value |  |  |  |  |  |  |  |  | 5,432,858 |  |  |
Total available for sale securities: |  |  |  |  |  |  |  |  |  |  |
Amortized cost |  |  |  |  |  |  |  |  | $ | 10,675,475 |  |  |
Fair value |  |  |  |  |  |  |  |  | 10,152,663 |  |  |
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,
| 2022 |  | 2021 |  | 2022 |  | 2021
Proceeds | $ | 156,116 |  |  | $ | 338,109 |  |  | $ | 211,301 |  |  | $ | 394,146 |
Gross realized gains | 1,461 |  |  | 1,767 |  |  | 3,394 |  |  | 2,240 |
Gross realized losses | (273) |  |  | (337) |  |  | (1,269) |  |  | (343) |
Related federal and state income tax expense | 278 |  |  | 336 |  |  | 497 |  |  | 455 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table Text Block] |
|  | June 30, 2022
|  | 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 |  |  | $ | 927 |  |  | $ | 73 |  |  | $ | — |  |  | $ | — |  |  | $ | 927 |  |  | $ | 73 |
Municipal securities |  | 207 |  |  | 403,086 |  |  | 35,397 |  |  | 116,482 |  |  | 13,561 |  |  | 519,568 |  |  | 48,958 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential agency |  | 529 |  |  | 4,521,335 |  |  | 172,417 |  |  | 76,078 |  |  | 4,802 |  |  | 4,597,413 |  |  | 177,219 |
Residential non-agency |  | 23 |  |  | 475,508 |  |  | 23,118 |  |  | — |  |  | — |  |  | 475,508 |  |  | 23,118 |
Commercial agency |  | 280 |  |  | 2,822,610 |  |  | 189,150 |  |  | 1,188,817 |  |  | 99,459 |  |  | 4,011,427 |  |  | 288,609 |
Other debt securities |  | 1 |  |  | — |  |  | — |  |  | 472 |  |  | 28 |  |  | 472 |  |  | 28 |
Total available for sale securities |  | 1,041 |  |  | $ | 8,223,466 |  |  | $ | 420,155 |  |  | $ | 1,381,849 |  |  | $ | 117,850 |  |  | $ | 9,605,315 |  |  | $ | 538,005 |
|  | December 31, 2021
|  | 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 |  |  | $ | 1,000 |  |  | $ | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,000 |  |  | $ | 1 |
Municipal securities |  | 175 |  |  | 423,575 |  |  | 7,762 |  |  | 22,476 |  |  | 726 |  |  | 446,051 |  |  | 8,488 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential agency |  | 120 |  |  | 2,382,094 |  |  | 37,121 |  |  | 750,044 |  |  | 20,327 |  |  | 3,132,138 |  |  | 57,448 |
Commercial agency |  | 165 |  |  | 2,104,689 |  |  | 35,488 |  |  | 703,216 |  |  | 12,527 |  |  | 2,807,905 |  |  | 48,015 |
Other debt securities |  | 1 |  |  | — |  |  | — |  |  | 472 |  |  | 28 |  |  | 472 |  |  | 28 |
Total available for sale securities |  | 462 |  |  | $ | 4,911,358 |  |  | $ | 80,372 |  |  | $ | 1,476,208 |  |  | $ | 33,608 |  |  | $ | 6,387,566 |  |  | $ | 113,980 |
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, 2022 |  | December 31, 2021
|  | Fair Value |  | Net Unrealized Gain (Loss) |  | Fair Value |  | Net Unrealized Gain (Loss)
Residential agency mortgage-backed securities |  | $ | 37,927 |  |  | $ | (1,630) |  |  | $ | 43,770 |  |  | $ | 1,591 |

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