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Securities (Tables)
 9 Months Ended
Sep. 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):
 
 September 30, 2022December 31, 2021
 Fair ValueNet Unrealized Gain (Loss)Fair ValueNet Unrealized Gain (Loss)
U.S. government securities$8,757 $— $23,610 $40 
Residential agency mortgage-backed securities
2,138,527 (68,373)9,068,900 (9,338)
Municipal securities22,611 (427)25,783 34 
Other trading securities24,723 (500)18,520 (26)
Total trading securities$2,194,618 $(69,300)$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):
 September 30, 2022
 AmortizedCarryingFairGross Unrealized
 Cost
Value1
ValueGainLoss
Municipal securities$173,113 $173,113 $176,990 $5,138 $(1,261)
Mortgage-backed securities:
Residential agency2,614,691 2,373,039 2,205,333 167 (167,873)
Commercial agency17,260 15,532 14,437 — (1,095)
Other debt securities11,288 11,288 11,006 — (282)
Total investment securities2,816,352 2,572,972 2,407,766 5,305 (170,511)
Allowance for credit losses(612)(612)
Investment securities, net of allowance$2,815,740 $2,572,360 $2,407,766 $5,305 $(170,511)
1    Carrying value includes $243 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 as discussed in greater detail following.
 December 31, 2021
 AmortizedCarryingFairGross Unrealized
 CostValueValueGainLoss
Municipal securities$203,772 $203,772 $223,609 $19,851 $(14)
Mortgage-backed securities:
Residential agency6,939 6,939 7,500 561 — 
Other debt securities288 288 286 — (2)
Total investment securities210,999 210,999 231,395 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 September 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
Maturity1
Fixed maturity debt securities:     
Carrying value$23,919 $102,100 $68,921 $4,993 $199,933 4.57 
Fair value24,075 106,695 66,693 4,970 202,433  
Residential mortgage-backed securities:      
Carrying value    $2,373,039 2
Fair value    2,205,333  
Total investment securities:      
Carrying value    $2,572,972  
Fair value    2,407,766  
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 5.5 years years based upon current prepayment assumptions.

Temporarily Impaired Investment Securities
(dollars in thousands):
September 30, 2022
 Number of SecuritiesLess Than 12 Months12 Months or LongerTotal
Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss
Investment:       
Municipal securities58 $39,774 $1,178 $519 $83 $40,293 $1,261 
Mortgage-backed securities:
Residential agency116 2,204,036 167,873 — — 2,204,036 167,873 
Commercial agency2 14,437 1,095 — — 14,437 1,095 
Other debt securities3 9,734 266 259 16 9,993 282 
Total investment securities179 $2,267,981 $170,412 $778 $99 $2,268,759 $170,511 

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):
 September 30, 2022
 AmortizedFairGross Unrealized
 CostValueGainLoss
U.S. Treasury$1,000 $890 $— $(110)
Municipal securities689,779 619,349 — (70,430)
Mortgage-backed securities:    
Residential agency5,286,454 4,894,569 221 (392,106)
Residential non-agency545,094 506,394 10,532 (49,232)
Commercial agency4,453,855 4,019,220 — (434,635)
Other debt securities500 472 — (28)
Total available for sale securities$10,976,682 $10,040,894 $10,753 $(946,541)
 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 September 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
Maturity1
Fixed maturity debt securities:
Amortized cost$122,091 $2,162,215 $2,420,097 $440,731 $5,145,134 6.15 
Fair value120,736 2,007,747 2,108,706 402,742 4,639,931 
Residential mortgage-backed securities:
Amortized cost$5,831,548 2
Fair value5,400,963 
Total available for sale securities:
Amortized cost$10,976,682 
Fair value10,040,894 
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 years based upon current prepayment assumptions.
Sales of available for sale securities resulted in gains and losses as follows (in thousands):
 Three Months Ended
September 30,		Nine Months Ended September 30,
 2022202120222021
Proceeds$30,834 $94,128 $242,135 $488,274 
Gross realized gains1,116 1,572 4,510 3,812 
Gross realized losses(224)(317)(1,493)(660)
Related federal and state income tax expense209 301 706 756 
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table Text Block]
September 30, 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. Treasury1 $890 $110 $— $— $890 $110 
Municipal securities238 275,952 20,417 343,396 50,013 619,348 70,430 
Mortgage-backed securities:
    
Residential agency621 4,761,363 381,057 105,816 11,049 4,867,179 392,106 
Residential non-agency25 489,067 49,232 — — 489,067 49,232 
Commercial agency281 1,866,226 114,850 2,152,994 319,785 4,019,220 434,635 
Other debt securities1 — — 472 28 472 28 
Total available for sale securities1,167 $7,393,498 $565,666 $2,602,678 $380,875 $9,996,176 $946,541 

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 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 securities1 — — 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):
 September 30, 2022December 31, 2021
 Fair ValueNet Unrealized Gain (Loss)Fair ValueNet Unrealized Gain (Loss)
Residential agency mortgage-backed securities
$33,966 $(3,767)$43,770 $1,591