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Securities (Tables)
 12 Months Ended
Dec. 31, 2022
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, 2022December 31, 2021
 Fair ValueNet Unrealized Gain (Loss)Fair ValueNet Unrealized Gain (Loss)
U.S. government securities$9,823 $(16)$23,610 $40 
Residential agency mortgage-backed securities
4,406,848 4 9,068,900 (9,338)
Municipal securities21,484 (136)25,783 34 
Other trading securities26,006 (175)18,520 (26)
Total trading securities$4,464,161 $(323)$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):
 December 31, 2022
 AmortizedCarryingFairGross 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 securities$2,739,241 $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 Accumulated Other Comprehensive Income ("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, 2021
 AmortizedCarrying FairGross Unrealized
 CostValueValueGainLoss
Municipal securities$203,772 $203,772 $223,609 $19,851 $(14)
Residential agency mortgage-backed securities6,939 6,939 7,500 561 — 
Other debt securities288 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)
The amortized cost and fair values of investment securities at December 31, 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
Maturity1
Fixed maturity debt securities:     
Carrying value$23,329 $103,089 $67,660 $4,948 $199,026 4.33 
Fair value23,440 109,073 65,947 4,948 203,408  
Residential mortgage-backed securities:      
Carrying value    $2,315,219 
2
Fair value    2,143,360  
Total investment securities:      
Carrying value    $2,514,245  
Fair value    2,346,768  
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 5.4 years based upon current prepayment assumptions.


Temporarily Impaired Investment Securities
(In thousands):
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 

December 31, 2021
 Number of SecuritiesLess Than 12 Months12 Months or LongerTotal
Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss
Investment:       
Municipal securities1 $— $— $587 $14 $587 $14 
Other debt securities2 273 2 — — 273 2 
Total investment securities3 $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):
 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)
 December 31, 2021
 AmortizedFairGross Unrealized
 CostValueGainLoss
U.S. Treasury$1,001 $1,000 $— $(1)
Municipal securities515,551 508,365 1,302 (8,488)
Mortgage-backed securities:   
Residential agency7,908,587 8,006,616 155,477 (57,448)
Residential non-agency10,625 24,339 13,714 — 
Commercial agency4,628,172 4,617,025 36,868 (48,015)
Other debt securities500 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 December 31, 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
Maturity1
Fixed maturity debt securities: 
Amortized cost$121,279 $2,529,961 $2,396,317 $534,075 $5,581,632 6.11 
Fair value118,907 2,358,353 2,126,561 497,967 5,101,788 
Residential mortgage-backed securities:     
Amortized cost    $6,777,781 
2
Fair value    6,392,072 
Total available-for-sale securities:      
Amortized cost    $12,359,413  
Fair value    11,493,860  
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 4.4 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,
 202220212020
Proceeds$307,481 $622,881 $384,507 
Gross realized gains5,054 5,702 9,976 
Gross realized losses(6,025)(1,998)(66)
Related federal and state income tax expense(227)889 2,524 
Debt Securities, Available for Sale, Unrealized Loss Position [Table Text Block]
Temporarily Impaired Available for Sale Securities
(In thousands)
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 
December 31, 2021
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 $1,000 $1 $— $— $1,000 $1 
Municipal securities175 423,575 7,762 22,476 726 446,051 8,488 
Mortgage-backed securities:
     
Residential agency120 $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 securities1 — — 472 28 472 28 
Total available for sale securities462 $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):
 December 31, 2022December 31, 2021
 Fair ValueNet Unrealized Gain (Loss)Fair ValueNet Unrealized Gain (Loss)
Residential agency mortgage-backed securities$296,590 $338 $43,770 $1,591