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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Related Party Transaction [Line Items]      
Realized gain (loss) on sale of available for sale Agency Securities $ (7,471) $ 0  
Reverse repurchase agreements 504,375   $ 704,276
Obligations to return securities received as collateral 509,121   502,656
Repurchase Agreements      
Related Party Transaction [Line Items]      
Reverse repurchase agreements 504,375   704,276
BUCKLER Securities, LLC      
Related Party Transaction [Line Items]      
Obligations to return securities received as collateral 101,824   $ 100,531
Agency Securities      
Related Party Transaction [Line Items]      
Realized gain (loss) on sale of available for sale Agency Securities $ (7,471)