Derivative Instruments, Offsetting Liabilities (Details) - USD ($) $ in Thousands		Dec. 31, 2023	Dec. 31, 2022
Offsetting Derivative Liabilities [Abstract]
Gross amounts of recognized liabilities		$ 930,490	$ 855,251
Gross amounts offset in the consolidated balance sheet		(10,384)	(4,571)
Net amounts of liabilities presented in the consolidated balance sheet		920,106	850,680
Gross amounts not offset in the consolidated balance sheet in financial instruments		(933,218)	(857,507)
Gross amounts not offset in the consolidated balance sheet in cash collateral received (pledged)	[1]	13,112	6,827
Net amount		0	0
Repurchase Agreements [Member]
Offsetting Derivative Liabilities [Abstract]
Gross amounts of recognized liabilities		903,489	825,962
Gross amounts offset in the consolidated balance sheet		0	0
Net amounts of liabilities presented in the consolidated balance sheet		903,489	825,962
Gross amounts not offset in the consolidated balance sheet in financial instruments		(933,042)	(830,022)
Gross amounts not offset in the consolidated balance sheet in cash collateral received (pledged)	[1]	29,553	4,060
Net amount		0	0
Interest Rate Swaps [Member]
Offsetting Derivative Liabilities [Abstract]
Gross amounts of recognized liabilities		2,799	24,718
Gross amounts offset in the consolidated balance sheet		0	0
Net amounts of liabilities presented in the consolidated balance sheet		2,799	24,718
Gross amounts not offset in the consolidated balance sheet in financial instruments		(2,799)	(24,718)
Gross amounts not offset in the consolidated balance sheet in cash collateral received (pledged)	[1]	0	0
Net amount		0	0
TBAs [Member]
Offsetting Derivative Liabilities [Abstract]
Gross amounts of recognized liabilities		15,517	4,571
Gross amounts offset in the consolidated balance sheet		(3,350)	(4,571)
Net amounts of liabilities presented in the consolidated balance sheet		12,167	0
Gross amounts not offset in the consolidated balance sheet in financial instruments		(1,162)	(2,767)
Gross amounts not offset in the consolidated balance sheet in cash collateral received (pledged)	[1]	(11,005)	2,767
Net amount		0	$ 0
U.S. Treasury Futures [Member]
Offsetting Derivative Liabilities [Abstract]
Gross amounts of recognized liabilities		8,685
Gross amounts offset in the consolidated balance sheet		(7,034)
Net amounts of liabilities presented in the consolidated balance sheet		1,651
Gross amounts not offset in the consolidated balance sheet in financial instruments		3,785
Gross amounts not offset in the consolidated balance sheet in cash collateral received (pledged)	[1]	(5,436)
Net amount		$ 0

[1] Includes cash pledged / received as collateral. Amounts presented are limited to collateral pledged sufficient to reduce the net amount to zero for individual counterparties, as applicable.