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Securities (Tables)
 3 Months Ended
Mar. 31, 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):
 
 March 31, 2022December 31, 2021
 Fair ValueNet Unrealized Gain (Loss)Fair ValueNet Unrealized Gain (Loss)
U.S. government securities$13,513 $(10)$23,610 $40 
Residential agency mortgage-backed securities
4,827,504 (135,438)9,068,900 (9,338)
Municipal securities24,539 (478)25,783 34 
Other trading securities25,540 (148)18,520 (26)
Total trading securities$4,891,096 $(136,074)$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):
 March 31, 2022
 AmortizedFairGross Unrealized
 CostValueGainLoss
Municipal securities$177,683 $184,214 $7,155 $(624)
Residential agency mortgage-backed securities
6,486 6,741 283 (28)
Other debt securities288 280 — (8)
Total investment securities184,457 191,235 7,438 (660)
Allowance for credit losses(633)
Investment securities, net of allowance$183,824 $191,235 $7,438 $(660)
 December 31, 2021
 AmortizedFairGross Unrealized
 CostValueGainLoss
Municipal securities$203,772 $223,609 $19,851 $(14)
Residential agency mortgage-backed securities
6,939 7,500 561 — 
Other debt securities288 286 — (2)
Total investment securities210,999 231,395 20,412 (16)
Allowance for credit losses(555)
Investment securities, net of allowance$210,444 $231,395 $20,412 $(16)
The amortized cost and fair values of investment securities at March 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$14,901 $104,681 $52,359 $6,030 $177,971 4.55 
Fair value15,080 110,636 52,834 5,944 184,494  
Residential mortgage-backed securities:      
Amortized cost    $6,486 2
Fair value    6,741  
Total investment securities:      
Amortized cost    $184,457  
Fair value    191,235  
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.

Temporarily Impaired Investment Securities
(in thousands):
March 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 securities35 $22,394 $566 $544 $58 $22,938 $624 
Residential agency mortgage-backed securities
1 1,534 28 — — 1,534 28 
Other debt securities2 243 7 24 1 267 8 
Total investment securities38 $24,171 $601 $568 $59 $24,739 $660 

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):
 March 31, 2022
 AmortizedFairGross Unrealized
 CostValueGainLoss
U.S. Treasury$1,000 $947 $— $(53)
Municipal securities562,065 526,322 144 (35,887)
Mortgage-backed securities:    
Residential agency7,913,760 7,612,021 14,727 (316,466)
Residential non-agency339,904 347,187 13,279 (5,996)
Commercial agency4,623,902 4,407,585 2,809 (219,126)
Other debt securities500 472 — (28)
Total available for sale securities$13,441,131 $12,894,534 $30,959 $(577,556)
 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 March 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$48,510 $1,968,389 $2,683,456 $487,112 $5,187,467 6.59 
Fair value48,612 1,911,239 2,507,611 467,864 4,935,326 
Residential mortgage-backed securities:
Amortized cost$8,253,664 2
Fair value7,959,208 
Total available for sale securities:
Amortized cost$13,441,131 
Fair value12,894,534 
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 4.3 years based upon current prepayment assumptions.
Sales of available for sale securities resulted in gains and losses as follows (in thousands):
 Three Months Ended
March 31,
 20222021
Proceeds$55,185 $56,037 
Gross realized gains1,933 473 
Gross realized losses(996)(6)
Related federal and state income tax expense219 119 
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table Text Block]
March 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. Treasury1 $947 $53 $— $— $947 $53 
Municipal securities202 $400,690 $26,297 $111,502 $9,590 $512,192 $35,887 
Mortgage-backed securities:
    
Residential agency508 5,127,508 191,126 1,412,323 125,340 6,539,831 316,466 
Residential non-agency15 304,149 5,996 — — 304,149 5,996 
Commercial agency238 2,988,497 177,409 773,363 41,717 3,761,860 219,126 
Other debt securities1 — — 472 28 472 28 
Total available for sale securities965 $8,821,791 $400,881 $2,297,660 $176,675 $11,119,451 $577,556 

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):
 March 31, 2022December 31, 2021
 Fair ValueNet Unrealized Gain (Loss)Fair ValueNet Unrealized Gain (Loss)
Residential agency mortgage-backed securities
$185,003 $(4,017)$43,770 $1,591