Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash Flows from Operating Activities
Net income	$ 91,693	$ 89,584
Adjustments to reconcile net income to net cash provided by/(used in) operating activities:
Credit for loan losses	(3,000)	(9,000)
Provision/(credit) for losses on other real estate owned	(675)	10,362
Deferred tax (asset)/liability	(12,325)	5,901
Depreciation	4,899	4,435
Net losses on sale and transfer of other real estate owned	(843)	(700)
Net gains on sale of loans	(864)	(618)
Proceeds from sales of loans	41,219	58,505
Originations of loans held-for-sale	(40,356)	(57,861)
Net change in trading securities	(152)	(79)
Write-downs on venture capital investments	295	226
Gain on sales and calls of securities	(27,157)	(13,241)
Amortization/accretion of security premiums/discounts, net	3,439	3,800
Amortization of other intangible assets	4,192	4,368
Excess tax short-fall from share-based payment arrangements	143	679
Stock based compensation and stock issued to officers as compensation	2,775	2,251
Net change in accrued interest receivable and other assets	24,875	31,746
Net change in other liabilities	4,195	(3,999)
Net cash provided by operating activities	92,353	126,359
Cash Flows from Investing Activities
Decrease/(increase) in short-term investments	22,959	(131,500)
Purchase of investment securities available-for-sale	(1,026,659)	(971,983)
Proceeds from sale of investment securities available-for-sale	903,915	429,923
Proceeds from repayments, maturities and calls of investment securities available-for-sale	367,026	572,957
Proceeds from repayments, maturities and calls of investment securities held-to-maturity	50,973	301,981
Redemptions of Federal Home Loan Bank stock	12,589	7,496
Net increase in loans	(413,405)	(224,244)
Purchase of premises and equipment	(4,734)	(2,312)
Proceeds from sale of other real estate owned	9,926	33,167
Net increase in investment in affordable housing	(6,167)	(2,639)
Net cash (used in)/provided by investing activities	(83,577)	12,846
Cash Flows from Financing Activities
Net increase in deposits	534,306	124,090
Net decrease in federal funds purchased and securities sold under agreements to repurchase	(450,000)	(50,000)
Advances from Federal Home Loan Bank	1,742,396	406,200
Repayment of Federal Home Loan Bank borrowings	(1,512,000)	(610,000)
Cash dividends paid	(8,631)	(12,036)
Redemption of series B preferred stock	(258,000)
Repayment of other borrowings		(880)
Proceeds from shares issued under Dividend Reinvestment Plan	202	211
Proceeds from exercise of stock options		647
Excess tax short-fall from share-based payment arrangements	(143)	(679)
Net cash provided by/(used in) financing activities	48,130	(142,447)
(Decrease)/increase in cash and cash equivalents	56,906	(3,242)
Cash and cash equivalents, beginning of the period	144,909	117,888
Cash and cash equivalents, end of the period	201,815	114,646
Cash paid during the period:
Interest	65,372	87,383
Income taxes paid	55,537	24,908
Non-cash investing and financing activities:
Net change in unrealized holding (loss)/gain on securities available-for-sale, net of tax	(21,648)	10,679
Transfers investment securities to available-for-sale from held-to-maturity	722,466
Transfers to other real estate owned from loans held for investment	11,877	13,216
Loans transferred from held for investment to held for sale, net		234
Loans to facilitate the sale of other real estate owned	75	1,785
Transfer of securities sold but not yet settled to other assets	$ 12,469