Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating Activities:
Net income	$ 173,697	$ 151,378	$ 72,258
Income from discontinued operations, net of tax	0	1,995	94
Income from continuing operations	173,697	149,383	72,164
Adjustments to reconcile income from continuing operations to net cash provided by operating activities:
Provision for loan and lease losses	21,500	22,500	115,000
Deferred tax expense	20,992	28,975	12,371
Depreciation and amortization	108,539	83,154	92,644
Stock-based compensation	8,955	6,040	6,740
Excess tax benefits from stock-based compensation	(812)	(392)	(92)
(Gain) loss on sale and write-down of foreclosed and repossessed assets	(2,344)	5,954	5,158
Write-down of premises and equipment	57	2,110	3,007
Loss on sale of premises and equipment	688	961	0
Loss on write-down of investments to fair value	0	0	5,838
Loss (gain) on fair value adjustment of private equities	720	(1,605)	(402)
Loss on fair value adjustment of derivative instruments	48	1,815	2,462
Net gain on the sale of investment securities	(3,347)	(3,823)	(9,748)
Net decrease (increase) in trading securities	0	11,554	(11,554)
Increase in cash surrender value of life insurance policies	(11,254)	(10,360)	(10,517)
Gain from life insurance policies	0	(798)	(1,986)
Net increase in loans held for sale	(27,572)	(5,167)	(39,696)
Net (increase) decrease in accrued interest receivable and other assets	(12,197)	(7,013)	71,452
Net (decrease) increase in accrued expenses and other liabilities	(20,588)	(17,158)	24,113
Net cash provided by operating activities	257,082	266,130	336,954
Investing Activities:
Net (increase) decrease in interest-bearing deposits	(2,143)	(43,251)	337,499
Purchases of available for sale securities	(1,204,079)	(1,305,583)	(1,297,512)
Proceeds from maturities and principal payments of available for sale securities	854,747	545,933	608,710
Proceeds from sales of available for sale securities	148,222	278,757	416,474
Purchases of held-to-maturity securities	(946,996)	(493,618)	(1,019,398)
Proceeds from maturities and principal payments of held-to-maturity securities	796,481	579,931	594,088
Purchase of Federal Home Loan Bank and Federal Reserve Board stock	(11,756)	0	(3,000)
Net increase in loans	(915,435)	(338,037)	(173,635)
Purchase of life insurance policies	(100,000)	0	0
Proceeds from life insurance policies	0	2,268	3,840
Proceeds from the sale of foreclosed properties and repossessed assets	11,469	26,877	33,097
Proceeds from the sale of premises and equipment	1,381	3,881	675
Purchases of premises and equipment	(21,983)	(28,867)	(18,679)
Net cash used for investing activities	(1,390,092)	(771,709)	(517,841)
Financing Activities:
Net increase (decrease) in deposits	874,810	47,240	(23,342)
Proceeds from Federal Home Loan Bank advances	6,919,849	1,678,934	1,827,000
Repayments of Federal Home Loan Bank advances	(6,344,126)	(1,193,520)	(1,602,429)
Net (decrease) increase in securities sold under agreements to repurchase and other short-term borrowings	(88,546)	73,229	235,833
Issuance of preferred stock	122,710	0	0
Redemption of preferred stock	0	0	(400,000)
Redemption of subsidiary preferred stock	0	(9,577)	0
Repayment of long-term debt	(210,971)	(22,689)	0
Cash dividends paid to common shareholders	(30,667)	(13,978)	(3,133)
Cash dividends paid to preferred shareholders of consolidated subsidiary	0	(826)	(863)
Cash dividends paid to preferred shareholders	(2,460)	(2,460)	(17,223)
Exercise of stock options	996	213	378
Excess tax benefits from stock-based compensation	812	392	92
Warburg investment	0	0	36,440
Issuance of common stock	560	689	118,359
Common stock repurchased	(53,243)	(1,670)	(1,654)
Common stock warrants repurchased	(388)	(16,285)	0
Net cash provided by financing activities	1,189,336	539,692	169,458
Cash Flows from Discontinued Operations:
Operating activities	0	1,995	94
Net cash provided by discontinued operations	0	1,995	94
Net increase (decrease) in cash and due from banks	56,326	36,108	(11,335)
Cash and due from banks at beginning of year	195,957	159,849	171,184
Cash and due from banks at end of year	252,283	195,957	159,849
Supplemental disclosure of cash flow information:
Interest paid	116,412	142,984	173,182
Income taxes paid	56,491	32,912	20,577
Noncash investing and financing activities:
Transfer of loans and leases, net to foreclosed properties and repossessed assets	7,539	9,568	37,498
Transfer of loans from portfolio to loans-held-for-sale	$ 22,670	$ 0	$ 0