CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Mar. 05, 2019	Mar. 31, 2020	Dec. 31, 2019
Preferred Stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Preferred Stock, shares authorized		50,000,000	50,000,000
Preferred Stock, shares issued	10,000,000	10,000,000
Preferred Stock, shares outstanding		10,000,000
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock	6.15%
Series A liquidation preference		$ 250,000
Series A Preferred Stock
Preferred Stock, par value (in dollars per share)		$ 0.01	$ 0.01
Preferred Stock, shares authorized		50,000,000	50,000,000
Preferred Stock, shares issued		10,000,000	10,000,000
Preferred Stock, shares outstanding		10,000,000	10,000,000
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock		6.15%	6.15%
Series A liquidation preference		$ 250,000	$ 250,000
Class A Common Stock
Common Stock, par value (in dollars per share)		$ 0.01	$ 0.01
Common Stock, authorized shares		500,000,000	500,000,000
Common Stock, issued shares		113,639,911	113,350,267
Common Stock, outstanding shares		113,639,911	113,350,267
Class B Non-Voting Common Stock
Common Stock, par value (in dollars per share)		$ 0.01	$ 0.01
Common Stock, authorized shares		10,000,000	10,000,000
Common Stock, issued shares		0	0
Common Stock, outstanding shares		0	0