CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Available-for-sale investments, cost	$ 454,603	$ 182,325
Loans held for investment, allowance	$ 414,406	$ 341,121
Preferred stock, stated value (in dollars per share)	$ 0.20	$ 0.20
Preferred stock, shares authorized (in shares)	20,000,000	20,000,000
Common stock, par value (in dollars per share)	$ 0.20	$ 0.20
Common stock, shares authorized (in shares)	1,125,000,000.000	1,125,000,000.000
Common stock, shares issued (in shares)	453,500,000	449,900,000
Accumulated other comprehensive income, tax	$ (6,525)	$ 3,436
Common stock held in treasury (in shares)	31,300,000	14,200,000
Series B Preferred Stock
Preferred stock, stated value (in dollars per share)	$ 100	$ 100
Preferred stock, shares issued (in shares)	4,000,000	4,000,000