Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Debt Securities, Held-to-maturity, Fair Value	$ 5,835,364	$ 5,380,653
Loans Held-for-sale, Fair Value Disclosure	$ 14,000	$ 35,750
Preferred Stock, Par or Stated Value Per Share	$ 0.01
Preferred stock, shares authorized	3,000,000
Preferred Stock, Shares Outstanding	6,000	6,000
Preferred Stock, Shares Issued	6,000	6,000
Common stock par value (in usd per share)	$ 0.01	$ 0.01
Common Stock, Shares Authorized	200,000,000	200,000,000
Common stock, shares issued	93,686,311	93,686,311
Treasury Stock, Common, Shares	3,487,389	1,659,749