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Commitments - Schedule of Activity Related to HMBS Repurchases (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2021
USD ($)
loan
Securities
Long-term Purchase Commitment [Line Items]  
Beginning balance, repurchase securities, number | Securities 458
Additions, repurchase securities, number | Securities 255
Recoveries, net, repurchase securities, number | Securities (237)
Transfers, repurchase securities, number | Securities 0
Change in value, repurchase securities, number | Securities 0
Ending balance, repurchase securities, number | Securities 476
Beginning balance, repurchase securities, amount $ 86,301
Additions, repurchase securities, amount 61,822
Recoveries, repurchase securities, amount (48,459)
Transfers, repurchase securities, amount 0
Change in value, repurchase securities, amount (1,475)
Ending balance, repurchase securities, amount $ 98,189
Active  
Long-term Purchase Commitment [Line Items]  
Beginning balance, repurchase securities, number | loan 141
Additions, repurchase securities, number | loan 129
Recoveries, net, repurchase securities, number | loan (161)
Transfers, repurchase securities, number | loan (11)
Change in value, repurchase securities, number | loan 0
Ending balance, repurchase securities, number | Securities 98
Beginning balance, repurchase securities, amount $ 29,852
Additions, repurchase securities, amount 36,681
Recoveries, repurchase securities, amount (38,404)
Transfers, repurchase securities, amount (4,713)
Change in value, repurchase securities, amount 9
Ending balance, repurchase securities, amount $ 23,425
Inactive  
Long-term Purchase Commitment [Line Items]  
Beginning balance, repurchase securities, number | loan 317
Additions, repurchase securities, number | loan 126
Recoveries, net, repurchase securities, number | loan (76)
Transfers, repurchase securities, number | loan 11
Change in value, repurchase securities, number | loan 0
Ending balance, repurchase securities, number | Securities 378
Beginning balance, repurchase securities, amount $ 56,449
Additions, repurchase securities, amount 25,141
Recoveries, repurchase securities, amount (10,055)
Transfers, repurchase securities, amount 4,713
Change in value, repurchase securities, amount (1,484)
Ending balance, repurchase securities, amount $ 74,764