CONDENSED CONSOLIDATED BALANCE SHEETS PARENTHETICAL - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Available for Sale at Fair value - Amortized cost	$ 33,889,968	$ 30,211,787
Preferred stock par value (per share)	$ 0.01	$ 0.01
Preferred stock shares authorized	10,000,000	10,000,000
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0
Common stock par value (per share)	$ 0.01	$ 0.01
Common stock shares authorized	140,000,000	140,000,000
Common Stock, Shares, Issued	79,137,758	79,137,758
Common stock shares outstanding	64,368,271	64,302,502
Treasury stock, shares	14,769,487	14,835,256
Allowances for Loan and Lease Losses, Real Estate	$ 9,137	$ 7,685