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Valuation Unobservable Input Reconciliation (Details) - Level 3 [Member] - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Non-Agency RMBS [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance $ 15,500 $ 12,148 $ 11,834 $ 7,259
Purchases 1,158 1,375 10,378 7,849
Proceeds from sales (4,208) (1,375) (1,461) (6,502)
Principal repayments (42) (33) (173) 74
(Amortization)/accretion, net (45) 0 (160) (49)
Net realized gains (losses) (108) 25 162 23
Change in net unrealized gains (losses) 347 (688) 248 321
Transfers        
Transfers into level 3 3,735 4,722 1,751 7,347
Transfers out of level 3 0 0 (6,242) 0
Ending balance 16,337 16,174 16,337 16,174
Change in net unrealized gains (losses) for level 3 assets still held 300 (100) 400 300
Agency RMBS [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance 2,551 3,142 4,085 5,654
Purchases 0 0 0 174
Proceeds from sales 0 0 (1,484) 0
Principal repayments (337) 0 (382) 0
(Amortization)/accretion, net (174) (146) (384) (956)
Net realized gains (losses) (91) (240) (216) (181)
Change in net unrealized gains (losses) 179 163 200 824
Transfers        
Transfers into level 3 817 671 1,331 354
Transfers out of level 3 0 (895) (205) (3,174)
Ending balance 2,945 2,695 2,945 2,695
Change in net unrealized gains (losses) for level 3 assets still held 200 100 300 300
Residential Mortgage Backed Securities [Member]        
Transfers        
Transfers into level 3 $ 4,600 5,400 3,100 7,700
Transfers out of level 3   $ (900) $ (6,400) $ (3,200)