Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Assets:
Cash and due from banks	$ 261,544		$ 223,616
Interest-bearing deposits	132,695		23,674
Securities available-for-sale, at fair value	2,793,873		3,106,931
Securities held-to-maturity (fair value of $3,948,706 and $3,370,912)	3,872,955		3,358,721
Federal Home Loan Bank and Federal Reserve Bank stock	193,290		158,878
Loans held for sale	67,952		20,802
Loans and leases	13,900,025	[1]	12,699,776	[1]
Allowance for loan and lease losses	(159,264)		(152,573)
Loans and leases, net	13,740,761		12,547,203
Deferred Tax Assets, Net	74,077		65,109
Premises and equipment, net	121,933		121,605
Goodwill	529,887		529,887
Other intangible assets, net	2,666		5,351
Cash surrender value of life insurance policies	440,073		430,535
Accrued interest receivable and other assets	301,304		260,687
Total assets	22,533,010		20,852,999
Liabilities and shareholders' equity:
Non-interest-bearing	3,598,872		3,128,152
Interest-bearing	12,052,733		11,726,268
Total deposits	15,651,605		14,854,420
Securities sold under agreements to repurchase and other borrowings	1,250,756		1,331,662
Federal Home Loan Bank advances	2,859,431		2,052,421
Long-term debt	226,237		228,365
Accrued expenses and other liabilities	222,300		176,943
Total liabilities	20,210,329		18,643,811
Shareholders’ equity:
Common stock, $.01 par value: Authorized - 200,000,000 shares: Issued - - and 93,366,673 shares	936		934
Paid-in capital	1,127,534		1,125,584
Retained earnings	1,202,117		1,080,488
Treasury stock, at cost (3,241,555 and 3,407,256 shares)	(103,294)		(100,918)
Accumulated other comprehensive loss	(56,261)		(48,549)
Total shareholders' equity	2,322,681		2,209,188
Total liabilities and shareholders' equity	22,533,010		20,852,999
Series A Preferred Stock [Member]
Shareholders’ equity:
Preferred stock, $.01 par value; Authorized - 3,000,000 shares: Series A issued and outstanding - 28,939 shares and Series E issued and outstanding - 5,060 shares	28,939		28,939
Series E Preferred Stock [Member]
Shareholders’ equity:
Preferred stock, $.01 par value; Authorized - 3,000,000 shares: Series A issued and outstanding - 28,939 shares and Series E issued and outstanding - 5,060 shares	$ 122,710		$ 122,710

[1] Loans and leases include net deferred fees and unamortized premiums of $10.6 million and $13.3 million at December 31, 2014 and December 31, 2013, respectively.