CONSOLIDATED CONDENSED STATEMENTS OF CONDITION (Parenthetical) - USD ($) $ in Thousands		Jun. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Premises and equipment held for sale		$ 43,600	$ 53,200
Savings classified as held for sale			22,600
Time deposits held for sale			8,000
Non-interest bearing deposit liabilities held for sale			$ 4,800
Preferred stock, no par value (in dollars per share)		$ 0	$ 0
Preferred stock liquidation preference value (in dollars per share)		$ 100,000	$ 100,000
Preferred stock, shares authorized (in shares)		1,000	1,000
Preferred stock, shares issued (in shares)		1,000	1,000
Common stock, par value (in dollars per share)		$ 0.625	$ 0.625
Common stock, shares authorized (in shares)		400,000,000	400,000,000
Common stock, shares issued (in shares)		325,003,353	326,736,214
Mortgage loans secured by residential real estate in process of foreclosure	[1]	$ 29,712	$ 43,382
Residential Real Estate
Foreclosed residential real estate		8,900	11,700
Mortgage loans secured by residential real estate in process of foreclosure		6,100	6,300
Residential Real Estate | Loans Held-For-Sale
Foreclosed residential real estate		$ 21,400	$ 22,700

[1] June 30, 2018 and December 31, 2017 include $6.1 million and $6.3 million, respectively, of foreclosed residential real estate.