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Valuation Unobservable Input Reconciliation (Details) - Level 3 [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Agency RMBS [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 5,654 $ 8,196
Purchases 2,726 1,845
Proceeds from sales (761) 0
Principal repayments (133) 0
(Amortization)/accretion, net (1,358) (2,566)
Net realized gains (losses) (1,062) (1,043)
Change in net unrealized gains (losses) 1,748 172
Transfers    
Transfers into level 3 621 1,055
Transfers out of level 3 (3,350) (2,005)
Ending balance 4,085 5,654
Change in net unrealized gains (losses) for level 3 assets still held 1,200 200
Non-Agency RMBS [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 7,259 13,296
Purchases 12,807 2,701
Proceeds from sales (6,502) (4,040)
Principal repayments (128) 1,115
(Amortization)/accretion, net (71) 546
Net realized gains (losses) 23 270
Change in net unrealized gains (losses) 82 (141)
Transfers    
Transfers into level 3 3,060 337
Transfers out of level 3 (4,696) 4,595
Ending balance 11,834 7,259
Change in net unrealized gains (losses) for level 3 assets still held 300 (200)
Residential Mortgage Backed Securities [Member]    
Transfers    
Transfers into level 3 3,700 1,400
Transfers out of level 3 $ (8,000) $ (6,600)