Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash Flows from Operating Activities
Net income	$ 89,584	$ 72,901
Adjustments to reconcile net income to net cash provided by/(used in) operating activities:
Provision (credit) for loan losses	(9,000)	25,000
Provision for losses on other real estate owned	10,362	9,088
Deferred tax liability	5,901	4,380
Depreciation	4,435	4,577
Net gains on sale and transfer of other real estate owned	(700)	(4,842)
Net gains on sale of loans	(618)	(2,851)
Proceeds from sales of loans	58,505	20,699
Originations of loans held-for-sale	(57,861)	(10,992)
Increase in trading securities, net	(79)	(153,440)
Write-downs on venture capital investments	226	57
Gain on sales and calls of securities	(13,241)	(20,243)
Decrease in unrealized loss from interest rate swaps mark-to-market	(2,634)	(2,580)
Amortization/accretion of security premiums/discounts, net	3,800	2,903
Amortization of other intangible assets	4,368	4,475
Excess tax short-fall from share-based payment arrangements	679	276
Stock based compensation expense	1,801	1,278
Stock issued to officers as compensation	450
Decrease in deferred loan fees, net	587	739
Decrease in accrued interest receivable	2,684	5,463
Decrease in other assets, net	28,475	7,297
(Decrease)/increase in other liabilities	(1,365)	4,214
Net cash provided by/(used in) operating activities	126,359	(31,601)
Cash Flows from Investing Activities
(Increase)/decrease in short-term investments	(131,500)	172,629
Increase in securities purchased under agreements to resell		30,000
Purchase of investment securities available-for-sale	(317,597)	(371,116)
Proceeds from maturities and calls of investment securities available-for-sale	494,199	385,000
Proceeds from sale of investment securities available-for-sale	60,951	503,561
Purchase of mortgage-backed securities available-for-sale	(654,386)	(403,123)
Proceeds from repayment of mortgage-backed securities available-for-sale	78,758	83,594
Proceeds from sale of mortgage-backed securities available-for-sale	368,972	759,654
Purchase of mortgage-backed securities held-to-maturity		(480,083)
Proceeds from maturities and calls of investment securities held-to-maturity	301,981	82,703
Redemptions of Federal Home Loan Bank stock	7,496	7,698
Net increase in loans	(224,244)	(283,232)
Purchase of premises and equipment	(2,312)	(1,995)
Proceeds from sale of other real estate owned	33,167	50,115
Net increase in investment in affordable housing	(2,639)	(968)
Net cash provided by investing activities	12,846	534,437
Cash Flows from Financing Activities
Net increase in demand deposits, NOW accounts, money market and savings deposits	461,314	108,622
Net (decrease)/increase in time deposits	(337,224)	25,062
Net decrease in federal funds purchased and securities sold under agreements to repurchase	(50,000)	(153,500)
Advances from Federal Home Loan Bank	406,200	3,473
Repayment of Federal Home Loan Bank borrowings	(610,000)	(348,473)
Dividends paid on common stock	(2,361)	(2,359)
Dividends paid on preferred stock	(9,675)	(9,675)
Repayment of other borrowings	(880)	(5,695)
Proceeds from shares issued under Dividend Reinvestment Plan	211	205
Proceeds from exercise of stock options	647	1,306
Excess tax short-fall from share-based payment arrangements	(679)	(276)
Net cash used in financing activities	(142,447)	(381,310)
(Decrease)/increase in cash and cash equivalents	(3,242)	121,526
Cash and cash equivalents, beginning of the period	117,888	87,347
Cash and cash equivalents, end of the period	114,646	208,873
Cash paid during the period:
Interest	87,383	111,300
Income taxes paid	24,908	39,750
Non-cash investing and financing activities:
Net change in unrealized holding gain/(loss) on securities available-for-sale, net of tax	10,679	(4,469)
Loans to facilitate sale of loans		6,094
Transfers to other real estate owned from loans held for investment	13,216	73,161
Transfers to other real estate owned from loans held for sale		2,873
Loans transferred from held for investment to held for sale,net	234	4,139
Loans to facilitate the sale of other real estate owned	$ 1,785	$ 7,703