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Commitments - Schedule of Activity Related to HMBS Repurchases (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
loan
Securities
Long-term Purchase Commitment [Line Items]  
Beginning balance, repurchase securities, number | Securities 458
Additions, repurchase securities, number | Securities 132
Recoveries, net, repurchase securities, number | Securities (97)
Transfers, repurchase securities, number | Securities 0
Change in value, repurchase securities, number | Securities 0
Ending balance, repurchase securities, number | Securities 493
Beginning balance, repurchase securities, amount $ 86,301
Additions, repurchase securities, amount 30,870
Recoveries, repurchase securities, amount (20,633)
Transfers, repurchase securities, amount 0
Change in value, repurchase securities, amount (888)
Ending balance, repurchase securities, amount $ 95,650
Active  
Long-term Purchase Commitment [Line Items]  
Beginning balance, repurchase securities, number | loan 141
Additions, repurchase securities, number | loan 66
Recoveries, net, repurchase securities, number | loan (58)
Transfers, repurchase securities, number | loan (12)
Change in value, repurchase securities, number | loan 0
Ending balance, repurchase securities, number | Securities 137
Beginning balance, repurchase securities, amount $ 29,852
Additions, repurchase securities, amount 16,448
Recoveries, repurchase securities, amount (16,805)
Transfers, repurchase securities, amount (3,727)
Change in value, repurchase securities, amount 9
Ending balance, repurchase securities, amount $ 25,777
Inactive  
Long-term Purchase Commitment [Line Items]  
Beginning balance, repurchase securities, number | loan 317
Additions, repurchase securities, number | loan 66
Recoveries, net, repurchase securities, number | loan (39)
Transfers, repurchase securities, number | loan 12
Change in value, repurchase securities, number | loan 0
Ending balance, repurchase securities, number | Securities 356
Beginning balance, repurchase securities, amount $ 56,449
Additions, repurchase securities, amount 14,422
Recoveries, repurchase securities, amount (3,828)
Transfers, repurchase securities, amount 3,727
Change in value, repurchase securities, amount (897)
Ending balance, repurchase securities, amount $ 69,873