CONSOLIDATED BALANCE SHEETS PARENTHETICAL - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Available for Sale at Fair value - Amortized cost	$ 38,882,168	$ 35,281,412
Available-for-sale Equity Securities, Amortized Cost Basis	$ 107,721	$ 102,841
Preferred stock par value	$ 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	$ 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	62,814,368	64,452,095
Treasury Shares Held	16,323,390	14,685,663
Allowances for Loan and Lease Losses, Real Estate	$ 11,286	$ 9,384