CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Amortized Cost	$ 247,607	$ 211,406
Loans held for investment	$ 251,475	$ 184,701
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	1,125,000,000
Common stock, shares issued (in shares)	443,500,000	436,600,000
Accumulated other comprehensive loss tax benefit	$ 1,696	$ (5,364)
Common stock held in treasury	11,100,000	7,700,000
Series A Preferred Stock
Preferred stock, stated value (in dollars per share)	$ 50	$ 50
Preferred stock, shares issued (in shares)	0	3,300,000
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