CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Trading Securities, Debt, Amortized Cost	$ 0	$ 1,055
Amortized cost of investment securities available for sale	3,551,770	2,633,298
Held-to-maturity Securities, Fair Value	$ 160,582	$ 91,966
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	107,060,702	106,371,093
Common stock, shares outstanding	105,493,499	105,070,861