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Mortgage-Backed Securities - Summary of Credit Loss Allowance (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]        
Beginning allowance for credit losses $ 508 $ 1,817 $ 180 $ 0
Additions to the allowance for credit losses on securities for which credit losses were not previously recorded 7 22 475 6,582
Allowance on purchased financial assets with credit deterioration 0 0 0 0
Reductions for the securities sold during the period 0 0 0 (321)
Increase/(decrease) on securities with an allowance in the prior period (544) (1,074) (721) (3,778)
Write-offs charged against the allowance (23) (642) (86) (2,389)
Recoveries of amounts previously written off 174 44 274 73
Ending allowance for credit losses $ 122 $ 167 $ 122 $ 167