CONSOLIDATED STATEMENTS OF CONDITION - Entity [Domain] - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Assets
Cash And Due From Banks	$ 557,248	$ 381,095
Money Market Investments [Abstract]
Securities Purchased Under Agreements To Resell	138,067	151,134
Time deposits with other banks	3,116,872	1,671,252
Total money market investments	3,254,939	1,822,386
Trading Securities [Abstract]
Pledged securities with creditors' right to repledge	54,413	80,945
Other trading securities	87,182	57,582
Available For Sale Securities Abstract
Pledged securities with creditors' right to repledge	997,324	1,020,529
Other investment securities available-for-sale	4,587,754	4,294,630
Investment securities held-to-maturity, at amortized cost	101,861	103,170
Other investment securities, at lower of cost or realizable value	165,505	161,906
Loans held-for-sale, at lower of cost or fair value	202,287	106,104
Loans held-in-portfolio:
Loans held-in-portfolio	22,535,008	19,498,286
Covered Loans	689,650	2,542,662
Less- Unearned Income	99,863	93,835
Allowance for loan losses	550,813	601,792
Total loans held-in-portfolio, net	22,573,982	21,345,321
FDIC loss share asset	392,947	542,454
Premises and equipment, net	497,078	494,581
Accrued income receivable	130,281	121,818
Mortgage servicing assets, at fair value	206,357	148,694
Other Assets	2,184,907	1,646,443
Goodwill	505,435	465,676
Other intangible assets	74,854	37,595
Total assets	36,750,113	33,096,695
Deposits Abstract
Non-interest bearing	6,305,986	5,783,748
Interest bearing	21,444,708	19,023,787
Total deposits	27,750,694	24,807,535
Federal Funds Purchased and Securities Sold Under Agreements To Repurchase	1,121,244	1,271,657
Other short-term borrowings	101,200	21,200
Notes Payable	1,804,028	1,711,828
Other liabilities	1,021,540	1,012,029
Total liabilities	31,800,460	28,829,313
Stockholders Equity Abstract
Preferred stock	50,160	50,160
Common stock	1,037	1,036
Surplus	4,199,165	4,196,458
Retained Earnings (Accumulated Deficit)	924,134	253,717
Treasury stock	(5,812)	(4,117)
Accumulated other comprehensive (loss) income, net of tax	(219,031)	(229,872)
Total stockholders' equity	4,949,653	4,267,382
Total liabilities and stockholders' equity	36,750,113	33,096,695
Segment, Discontinued Operations [Member]
Deposits Abstract
Liabilities Of Disposal Group Including Discontinued Operation	1,754	5,064
Non Covered Under Loss Sharing Agreements With F D I C [Member]
Loans held-in-portfolio:
Other real estate owned	142,255	135,500
Covered Under Loss Sharing Agreements With F D I C [Member]
Loans held-in-portfolio:
Covered Loans	689,650	2,542,662
Other real estate owned	$ 33,504	$ 130,266