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Securities (Tables)
 12 Months Ended
Dec. 31, 2023
Marketable Securities [Abstract]  
Trading Securities [Table Text Block]
The fair value and net unrealized gain (loss) included in trading securities is as follows (in thousands):
 
 December 31, 2023December 31, 2022
 Fair ValueNet Unrealized Gain (Loss)Fair ValueNet Unrealized Gain (Loss)
U.S. government securities$10,959 $28 $9,823 $(16)
Residential agency mortgage-backed securities
5,105,137 98,124 4,406,848 4 
Municipal securities37,413 323 21,484 (136)
Other trading securities39,996 160 26,006 (175)
Total trading securities$5,193,505 $98,635 $4,464,161 $(323)
Investment Securities (Held-to-Maturity) [Table Text Block]
The amortized cost and fair values of investment securities are as follows (in thousands):
 December 31, 2023
 AmortizedCarryingFairGross Unrealized
 Cost
Value1
ValueGainLoss
Municipal securities$120,705 $120,705 $125,525 $5,014 $(194)
Mortgage-backed securities:
Residential agency2,255,340 2,092,083 1,917,810 125 (174,398)
Commercial agency17,258 15,914 15,067 — (847)
Other debt securities15,787 15,787 14,184 — (1,603)
Total investment securities2,409,090 2,244,489 2,072,586 5,139 (177,042)
Allowance for credit losses(336)(336)— — — 
Investment securities, net of allowance$2,408,754 $2,244,153 $2,072,586 $5,139 $(177,042)
1     Carrying value includes $165 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 Available for Sale securities portfolio to the Investment securities portfolio.
 December 31, 2022
 AmortizedCarrying FairGross Unrealized
 Cost
Value1
ValueGainLoss
Municipal securities$170,629 $170,629 $176,621 $6,456 $(464)
Mortgage-backed securities:
Residential agency2,538,565 2,315,219 2,143,360 155 (172,014)
Commercial agency17,259 15,609 14,588 — (1,021)
Other debt securities12,788 12,788 12,199 — (589)
Total investment securities2,739,241 2,514,245 2,346,768 6,611 (174,088)
Allowance for credit losses(558)(558)— — — 
Investment securities, net of allowance$2,738,683 $2,513,687 $2,346,768 $6,611 $(174,088)
1     Carrying value includes $225 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 Available for Sale securities portfolio to the Investment securities portfolio.

The amortized cost and fair values of investment securities at December 31, 2023, 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
Maturity1
Fixed maturity debt securities:     
Carrying value$17,262 $108,343 $26,788 $13 $152,406 3.29 
Fair value17,314 112,140 25,309 13 154,776  
Residential mortgage-backed securities:      
Carrying value    $2,092,083 
2
Fair value    1,917,810  
Total investment securities:      
Carrying value    $2,244,489  
Fair value    2,072,586  
1Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without penalty.
2The average expected lives of residential mortgage-backed securities were 5.0 years based upon current prepayment assumptions.
Temporarily Impaired Investment Securities
(In thousands):
December 31, 2023
 Number of SecuritiesLess Than 12 Months12 Months or LongerTotal
Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss
Investment:       
Municipal securities13 $1,931 $5 $6,600 $189 $8,531 $194 
Mortgage-backed securities:
Residential agency116 — — 1,916,732 174,398 1,916,732 174,398 
Commercial agency2 — — 15,067 847 15,067 847 
Other debt securities3 — — 8,672 1,603 8,672 1,603 
Total investment securities134 $1,931 $5 $1,947,071 $177,037 $1,949,002 $177,042 

December 31, 2022
 Number of SecuritiesLess Than 12 Months12 Months or LongerTotal
Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss
Investment:       
Municipal securities22 $18,037 $406 $544 $58 $18,581 $464 
Mortgage-backed securities:
Residential agency116 2,142,114 172,014 — — 2,142,114 172,014 
Commercial agency2 14,588 1,021 — — 14,588 1,021 
Other debt securities3 9,428 571 257 18 9,685 589 
Total investment securities143 $2,184,167 $174,012 $801 $76 $2,184,968 $174,088 
Available for Sale Securities [Table Text Block]
The amortized cost and fair value of available for sale securities are as follows (in thousands):
 December 31, 2023
 AmortizedFairGross Unrealized
 CostValueGainLoss
U.S. Treasury$1,000 $925 $— $(75)
Municipal securities544,707 502,833 1 (41,875)
Mortgage-backed securities:    
Residential agency7,066,645 6,834,720 36,983 (268,908)
Residential non-agency833,535 799,877 12,865 (46,523)
Commercial agency4,456,918 4,147,853 2,972 (312,037)
Other debt securities500 473 — (27)
Total available for sale securities$12,903,305 $12,286,681 $52,821 $(669,445)
 December 31, 2022
 AmortizedFairGross Unrealized
 CostValueGainLoss
U.S. Treasury$1,000 $898 $— $(102)
Municipal securities687,875 624,500 321 (63,696)
Mortgage-backed securities:   
Residential agency6,161,358 5,814,496 13,085 (359,947)
Residential non-agency616,423 577,576 11,776 (50,623)
Commercial agency4,892,257 4,475,917 3,479 (419,819)
Other debt securities500 473 — (27)
Total available for sale securities$12,359,413 $11,493,860 $28,661 $(894,214)

The amortized cost and fair values of available for sale securities at December 31, 2023, 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
Maturity1
Fixed maturity debt securities: 
Amortized cost$397,083 $3,008,053 $1,122,067 $475,922 $5,003,125 5.28 
Fair value392,254 2,764,659 1,040,314 454,857 4,652,084 
Residential mortgage-backed securities:     
Amortized cost    $7,900,180 
2
Fair value    7,634,597 
Total available for sale securities:
      
Amortized cost    $12,903,305  
Fair value    12,286,681  
1Expected maturities may differ from contractual maturities, because borrowers may have the right to call or prepay obligations with or without penalty.
2The average expected lives of residential mortgage-backed securities were 4.0 years based upon current prepayment assumptions.
Sales of available for sale securities resulted in gains and losses as follows (in thousands):
Year Ended December 31,
 202320222021
Proceeds$834,704 $307,481 $622,881 
Gross realized gains1,180 5,054 5,702 
Gross realized losses(31,816)(6,025)(1,998)
Related federal and state income tax expense (benefit)
(7,206)(227)889 
Debt Securities, Available for Sale, Unrealized Loss Position [Table Text Block]
Temporarily Impaired Available for Sale Securities
(In thousands)
December 31, 2023
 Number of SecuritiesLess Than 12 Months12 Months or LongerTotal
Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss
Available for sale:       
U.S. Treasury
1 $— $— $925 $75 $925 $75 
Municipal securities190 6,799 410 494,955 41,465 501,754 41,875 
Mortgage-backed securities:
Residential agency630 690,118 3,689 3,717,975 265,219 4,408,093 268,908 
Residential non-agency32 116,077 1,244 451,370 45,279 567,447 46,523 
Commercial agency
269 392,828 2,626 3,421,757 309,411 3,814,585 312,037 
Other debt securities1 — — 473 27 473 27 
Total available for sale securities1,123 $1,205,822 $7,969 $8,087,455 $661,476 $9,293,277 $669,445 
December 31, 2022
Number of SecuritiesLess Than 12 Months12 Months or LongerTotal
Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss
Available for sale:     
U.S. Treasury
1 $— $— $899 $102 $899 $102 
Municipal securities227 146,634 5,301 428,248 58,395 574,882 63,696 
Mortgage-backed securities:
     
Residential agency613 3,879,582 256,973 863,732 102,974 4,743,314 359,947 
Residential non-agency26 499,716 50,623 — — 499,716 50,623 
Commercial agency
285 1,647,778 63,701 2,535,816 356,118 4,183,594 419,819 
Other debt securities1 — — 473 27 473 27 
Total available for sale securities1,153 $6,173,710 $376,598 $3,829,168 $517,616 $10,002,878 $894,214 
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):
 December 31, 2023December 31, 2022
 Fair ValueNet Unrealized Gain (Loss)Fair ValueNet Unrealized Gain (Loss)
Residential agency mortgage-backed securities$20,671 $(1,406)$296,590 $338