Offsetting Assets and Liabilities - Offsetting Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Offsetting Derivative Liabilities [Abstract]
Derivative instruments, at fair value, gross amounts recognized	$ 32,295	$ 403
Derivative instruments, at fair value, gross amounts offset on the balance sheet	0	0
Derivative instruments, at fair value, net amount of liabilities presented on the balance sheet	32,295	403
Derivative instruments, at fair value, gross amounts not offset on balance sheet, financial instruments	0	0
Derivative instruments, at fair value, gross amounts not offset on the balance sheet, cash collateral pledged	64,393	3,435
Derivative instruments, at fair value, net amount	0	0
Repurchase agreements, commercial mortgage loans
Offsetting Securities Sold under Agreements to Repurchase [Abstract]
Repurchase agreements, gross amounts of recognized liabilities	1,019,600	276,340
Repurchase agreements, gross amounts offset on the balance sheet	0	0
Repurchase agreements, net amount of liabilities presented on the balance sheet	1,019,600	276,340
Repurchase agreements, gross amounts not offset on the balance sheet, financial instruments	1,460,317	496,030
Repurchase agreements, gross amounts not offset on the balance sheet, cash collateral pledged	5,015	5,016
Repurchase agreements, net amount	0	0
Repurchase agreements, real estate securities
Offsetting Securities Sold under Agreements to Repurchase [Abstract]
Repurchase agreements, gross amounts of recognized liabilities	4,178,784	186,828
Repurchase agreements, gross amounts offset on the balance sheet	0	0
Repurchase agreements, net amount of liabilities presented on the balance sheet	4,178,784	186,828
Repurchase agreements, gross amounts not offset on the balance sheet, financial instruments	4,370,239	245,956
Repurchase agreements, gross amounts not offset on the balance sheet, cash collateral pledged	0	1,146
Repurchase agreements, net amount	$ 0	$ 0