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Investment Securities - Summary of Purchases and Sales (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]      
Purchases/fundings $ 198,358 $ 22,408 $ 98,258
Sales 0 7,940 7,326
Principal collections 87,450 83,533 205,660
Redemptions 0 0  
VIE eliminations      
Debt Securities, Available-for-sale [Line Items]      
Purchases/fundings (240,301) (331,784) (351,220)
Sales (69,398) (165,494) (184,540)
Principal collections (68,873) (69,447) (45,642)
Redemptions (51,187) (10,474)  
Held-to-maturity      
Debt Securities, Available-for-sale [Line Items]      
Purchases/fundings 198,358 22,408 91,162
Sales 0 0 0
Principal collections 54,725 52,704 167,383
Redemptions 0 0  
RMBS | Available-for-sale      
Debt Securities, Available-for-sale [Line Items]      
Purchases/fundings 0 0 0
Sales 0 0 0
Principal collections 30,722 26,000 26,929
Redemptions 0 0  
RMBS | Fair value option      
Debt Securities, Available-for-sale [Line Items]      
Purchases/fundings 168,825 282,368 120,103
Sales 30,684 135,567 41,501
Principal collections 63,144 44,197 16,500
Redemptions 51,187 10,474  
CMBS | Fair value option      
Debt Securities, Available-for-sale [Line Items]      
Purchases/fundings 71,476 49,416 238,213
Sales 38,714 37,867 150,365
Principal collections 7,732 30,079 $ 40,490
Redemptions $ 0 $ 0