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Commitments - Schedule of Activity Related to HMBS Repurchases (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2020
USD ($)
Securities
loan
Long-term Purchase Commitment [Line Items]  
Beginning balance, repurchase securities, number | Securities 320
Additions, repurchase securities, number | Securities 378
Recoveries, net, repurchase securities, number | Securities (33)
Transfers, repurchase securities, number | Securities 0
Change in value, repurchase securities, number | Securities 0
Ending balance, repurchase securities, number | Securities 665
Beginning balance, repurchase securities, amount $ 35,693
Additions, repurchase securities, amount 73,664
Recoveries, repurchase securities, amount (17,972)
Transfers, repurchase securities, amount 0
Change in value, repurchase securities, amount (2,533)
Ending balance, repurchase securities, amount $ 88,852
Active  
Long-term Purchase Commitment [Line Items]  
Beginning balance, repurchase securities, number | loan 62
Additions, repurchase securities, number | loan 159
Recoveries, net, repurchase securities, number | loan (7)
Transfers, repurchase securities, number | loan (10)
Change in value, repurchase securities, number | loan 0
Ending balance, repurchase securities, number | Securities 204
Beginning balance, repurchase securities, amount $ 10,546
Additions, repurchase securities, amount 40,875
Recoveries, repurchase securities, amount (9,492)
Transfers, repurchase securities, amount (2,933)
Change in value, repurchase securities, amount 43
Ending balance, repurchase securities, amount $ 39,039
Inactive  
Long-term Purchase Commitment [Line Items]  
Beginning balance, repurchase securities, number | loan 258
Additions, repurchase securities, number | loan 219
Recoveries, net, repurchase securities, number | loan (26)
Transfers, repurchase securities, number | loan 10
Change in value, repurchase securities, number | loan 0
Ending balance, repurchase securities, number | Securities 461
Beginning balance, repurchase securities, amount $ 25,147
Additions, repurchase securities, amount 32,789
Recoveries, repurchase securities, amount (8,480)
Transfers, repurchase securities, amount 2,933
Change in value, repurchase securities, amount (2,576)
Ending balance, repurchase securities, amount $ 49,813