Consolidated Statements of Income and Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Interest income:
Loans and loans held for sale	$ 178,535	$ 103,126	$ 277,206	$ 206,208
Investment securities:
Taxable	29,138	21,783	48,377	44,201
Tax-exempt	6,098	3,846	10,143	7,426
Total investment securities interest	35,236	25,629	58,520	51,627
Total interest income	213,771	128,755	335,726	257,835
Interest expense:
Demand-interest bearing	656	236	974	483
Savings and money market accounts	6,469	5,033	11,784	10,136
Certificates and other time deposits	3,374	3,169	5,437	6,693
Securities sold under agreements to repurchase	329	276	642	544
Wholesale borrowings	1,169	1,118	2,019	2,269
Long-term Debt	3,743		5,491	0
Total interest expense	15,740	9,832	26,347	20,125
Net interest income	198,031	118,923	309,379	237,710
Provision for originated loan losses	(3,151)	(8,766)	(8,959)	(16,895)
Provision for covered loan losses	(4,158)	(3,430)	(8,297)	(9,362)
Net interest income after provision for loan losses	190,722	106,727	292,123	211,453
Other income:
Trust department income	9,167	5,730	14,907	11,357
Service charges on deposits	20,582	14,478	33,168	28,887
Credit card fees	14,317	11,216	24,540	21,396
ATM and other service fees	4,945	3,890	8,280	7,680
Bank owned life insurance income	3,641	2,923	8,538	5,979
Investment services and insurance	3,429	2,388	5,844	4,635
Investment securities (losses) gains, net	(2,794)	548	(2,803)	808
Loan sales and servicing income	7,985	5,139	15,848	11,830
Other operating income	8,167	8,989	18,510	14,455
Total other income	69,439	55,301	126,832	107,027
Other expenses:
Salaries, wages, pension and employee benefits	105,099	61,598	163,005	125,571
Net occupancy expense	13,346	7,971	21,628	16,563
Equipment expense	10,309	7,598	17,659	14,702
Stationery, supplies and postage	3,407	2,285	5,503	4,428
Bankcard, loan processing and other costs	12,417	8,858	20,257	16,511
Professional services	17,144	9,307	22,554	12,659
Amortization of intangibles	2,411	483	2,728	966
FDIC expense	4,149	3,463	7,675	7,183
Other operating expense	21,358	17,514	35,556	34,262
Total other expenses	189,640	119,077	296,565	232,845
Income before income tax expense	70,521	42,951	122,390	85,635
Income tax expense	22,071	12,366	36,594	24,706
Net income	48,450	30,585	85,796	60,929
Other comprehensive income (loss), net of taxes:
Changes in unrealized securities' holding gains and (losses), net of taxes of ($26.7) million and $2.2 million for the quarter ended and ($31.0) million and $3.2 million for the six months ended, respectively	(49,593)	4,103	(57,513)	5,987
Reclassification for realized securities' (gains) and losses, net of taxes of ($0.98) million and $0.19 million for the quarter ended and ($0.98)million and $0.28 million for the six months ended, respectively	1,816	(356)	1,822	(525)
Total other comprehensive gain (loss), net of taxes	(47,777)	3,747	(55,691)	5,462
Comprehensive income	673	34,332	30,105	66,391
Net income available to common shareholders	46,597	30,472	82,584	60,786
Net income used in diluted EPS calculation	$ 46,597	$ 30,472	$ 82,584	$ 60,786
Weighted average number of common shares outstanding - basic	157,863	109,562	133,909	109,386
Weighted average number of common shares outstanding-diluted	157,982	109,562	133,969	109,386
Basic earnings per common share (in dollars per share)	$ 0.30	$ 0.28	$ 0.62	$ 0.56
Diluted earnings per common share (in dollars per share)	$ 0.29	$ 0.28	$ 0.62	$ 0.56
Dividend per common share (in dollars per share)	$ 0.16	$ 0.16	$ 0.32	$ 0.32