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Commitments - Schedule of Activity Related to HMBS Repurchases (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
security
Schedule Of Repurchases Activity [Roll Forward]  
Beginning balance, repurchase securities, number | security 320
Additions, repurchase securities, number | security 517
Recoveries, net, repurchase securities, number | security (379)
Transfers, repurchase securities, number | security 0
Change in value, repurchase securities, number | security 0
Ending balance, repurchase securities, number | security 458
Beginning balance, repurchase securities, value | $ $ 35,693
Additions, repurchase securities, value | $ 104,436
Recoveries, repurchase securities, value | $ (50,339)
Transfers, repurchase securities, value | $ 0
Change in value, repurchase securities, value | $ (3,489)
Ending balance, repurchase securities, value | $ $ 86,301
Active  
Schedule Of Repurchases Activity [Roll Forward]  
Beginning balance, repurchase securities, number | security 62
Additions, repurchase securities, number | security 222
Recoveries, net, repurchase securities, number | security (134)
Transfers, repurchase securities, number | security (9)
Change in value, repurchase securities, number | security 0
Ending balance, repurchase securities, number | security 141
Beginning balance, repurchase securities, value | $ $ 10,546
Additions, repurchase securities, value | $ 59,589
Recoveries, repurchase securities, value | $ (38,093)
Transfers, repurchase securities, value | $ (2,233)
Change in value, repurchase securities, value | $ 43
Ending balance, repurchase securities, value | $ $ 29,852
Inactive  
Schedule Of Repurchases Activity [Roll Forward]  
Beginning balance, repurchase securities, number | security 258
Additions, repurchase securities, number | security 295
Recoveries, net, repurchase securities, number | security (245)
Transfers, repurchase securities, number | security 9
Change in value, repurchase securities, number | security 0
Ending balance, repurchase securities, number | security 317
Beginning balance, repurchase securities, value | $ $ 25,147
Additions, repurchase securities, value | $ 44,847
Recoveries, repurchase securities, value | $ (12,246)
Transfers, repurchase securities, value | $ 2,233
Change in value, repurchase securities, value | $ (3,532)
Ending balance, repurchase securities, value | $ $ 56,449