CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Loans and investments, net allowance for credit losses	$ 113,241	$ 148,329
Securities held-to-maturity, net allowance for credit losses	$ 1,753	$ 1,644
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	500,000,000	500,000,000
Common stock, shares issued (in shares)	151,362,181	123,181,173
Common stock, shares outstanding (in shares)	151,362,181	123,181,173
Assets	$ 15,073,845	$ 7,660,986
Liabilities	12,523,861	6,178,301
Consolidated VIEs
Assets	7,144,806	3,134,447
Liabilities	$ 5,902,623	$ 2,520,064
Special voting preferred shares
Preferred stock, shares issued (in shares)	16,325,095	17,560,633
Preferred stock, shares outstanding (in shares)	16,325,095	17,560,633
8.25% Series A cumulative redeemable preferred stock
Preferred stock, dividend rate (as a percent)	8.25%	8.25%
Preferred stock, shares issued (in shares)	0
Preferred stock, shares outstanding (in shares)		1,551,500
7.75% Series B cumulative redeemable preferred stock
Preferred stock, dividend rate (as a percent)	7.75%	7.75%
Preferred stock, shares issued (in shares)	0
Preferred stock, shares outstanding (in shares)		1,260,000
8.50% Series C preferred stock
Preferred stock, dividend rate (as a percent)	8.50%	8.50%
Preferred stock, shares issued (in shares)	0	900,000
6.375% Series D preferred stock
Preferred stock, dividend rate (as a percent)	6.375%	6.375%
Preferred stock, shares issued (in shares)	9,200,000
Preferred stock, shares outstanding (in shares)		0
6.25% Series E preferred stock
Preferred stock, dividend rate (as a percent)	6.25%
Preferred stock, shares issued (in shares)	5,750,000
Preferred stock, shares outstanding (in shares)		0
6.25% Series F preferred stock
Preferred stock, dividend rate (as a percent)	6.25%	6.25%
Preferred stock, shares issued (in shares)	8,050,000	0