Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Securities held-to-maturity ,fair value	$ 4,674,510	$ 4,209,121
Loans Held-for-sale, Fair Value Disclosure	$ 19,249	$ 7,908
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	3,000,000	3,000,000
Preferred stock, shares issued (in shares)	6,000	5,060
Common stock par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	93,686,311	93,686,311
Treasury stock ,shares (in shares)	1,678,893	1,508,456