Stockholders' Equity - Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Components of accumulated other comprehensive income/(loss)
Beginning balance	$ 1,883,242	$ 1,944,769	$ 1,899,915	$ 1,988,849
OCI before reclassifications	(202)	933	2,410	(6,988)
Amounts reclassified from AOCI	(7,328)	0	(9,986)	0
Other Comprehensive Income/(Loss)	(7,530)	933	(7,576)	(6,988)
Ending balance	1,880,468	1,848,516	1,880,468	1,848,516
Total  AOCI
Components of accumulated other comprehensive income/(loss)
Beginning balance	17,652	13,420	17,698	21,341
Ending balance	10,122	14,353	10,122	14,353
Net Unrealized Gain/(Loss) on AFS Securities
Components of accumulated other comprehensive income/(loss)
Beginning balance	17,652	13,420	17,698	21,341
OCI before reclassifications	(202)	933	2,410	(6,988)
Amounts reclassified from AOCI	(7,328)	0	(9,986)	0
Other Comprehensive Income/(Loss)	(7,530)	933	(7,576)	(6,988)
Ending balance	10,122	14,353	10,122	14,353
Net Unrealized Gain/(Loss) on Financing Agreements
Components of accumulated other comprehensive income/(loss)
Beginning balance	0	0	0	0
OCI before reclassifications	0	0	0	0
Amounts reclassified from AOCI	0	0	0	0
Other Comprehensive Income/(Loss)	0	0	0	0
Ending balance	$ 0	$ 0	$ 0	$ 0