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Securities, at Fair Value - Narrative (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]            
Securities, at fair value [1] $ 594,294,000   $ 333,364,000      
Allowance for loan loss 31,035,000 $ 36,927,000 35,314,000 $ 33,062,000 $ 35,457,000 $ 39,447,000
Securities, at fair value            
Debt Securities, Available-for-sale [Line Items]            
Securities, at fair value 91,200,000   97,900,000      
Amortized costs 89,000,000   86,400,000      
Gross unrealized gains $ 2,900,000   11,500,000      
Gross unrealized losses     $ (688,000)      
Weighted average yield 16.20%   14.30%      
Weighted average to maturity 3 months 18 days   9 months 18 days      
Optional extension period 2 years          
CRT securities            
Debt Securities, Available-for-sale [Line Items]            
CRT securities $ 82,500,000   $ 79,200,000      
Non-Agency MBS            
Debt Securities, Available-for-sale [Line Items]            
Securities, at fair value 24,300,000   24,600,000      
Gross unrealized losses 82,000   0      
CRT, Fair Value Option            
Debt Securities, Available-for-sale [Line Items]            
Securities, at fair value 50,900,000   48,600,000      
Debt securities, sold   369,000        
Realized gain   13,000        
Gross unrealized losses 0   $ 1,200,000      
AFS securities            
Debt Securities, Available-for-sale [Line Items]            
Gross unrealized losses 688,000          
Allowance for loan loss $ 0 $ 0        
[1] See Note 6 for information regarding the Company’s pledged assets.