CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Available-forsale investments at fair value, cost	$ 485,756	$ 182,325
Loans held for investment	$ 441,912	$ 341,121
Preferred stock, stated value (in dollars per share)	$ 0.2	$ 0.2
Preferred stock, shares authorized (in shares)	20,000,000	20,000,000
Common stock, par value (in dollars per share)	$ 0.2	$ 0.2
Common stock, shares authorized (in shares)	1,125,000,000	1,125,000,000
Common stock, shares issued (in shares)	453,600,000	449,900,000
Accumulated other comprehensive loss tax benefit	$ (3,995)	$ 3,436
Common stock held in treasury (in shares)	32,500,000	14,200,000
Series A Preferred Stock
Preferred stock, stated value (in dollars per share)	$ 0	$ 0
Preferred stock, shares issued (in shares)	0	0
Series B Preferred Stock
Preferred stock, stated value (in dollars per share)	$ 100	$ 100
Preferred stock, shares issued (in shares)	4,000,000.0	4,000,000