Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash Flows from Operating Activities
Net income	$ 59,064	$ 59,075
Adjustments to reconcile net income to net cash provided by/(used in) operating activities:
Credit for loan losses		(9,000)
Provision/(credit) for losses on other real estate owned	(894)	7,487
Deferred tax (asset)/liability	(16,523)	99
Depreciation	3,105	2,954
Net losses on sale and transfer of other real estate owned	(554)	732
Net gains on sale of loans	(834)	(613)
Proceeds from sales of loans	38,648	57,690
Originations of loans held-for-sale	(37,814)	(57,051)
Net change in trading securities	(113)	(99,893)
Write-downs on venture capital investments	211	187
Gain on sales and calls of securities	(18,469)	(4,589)
Amortization/accretion of security premiums/discounts, net	2,333	2,543
Amortization of other intangible assets	2,797	2,930
Excess tax short-fall from share-based payment arrangements	80	565
Stock based compensation and stock issued to officers as compensation	1,867	1,262
Net change in accrued interest receivable and other assets	35,849	46,924
Net change in other liabilities	5,025	(3,228)
Net cash provided by operating activities	73,778	8,074
Cash Flows from Investing Activities
Decrease/(increase) in short-term investments	272,142	(218,680)
Increase in securities purchased under agreements to resell		(10,000)
Purchase of investment securities available-for-sale	(776,453)	(597,499)
Proceeds from sale of investment securities available-for-sale	553,674	220,597
Proceeds from repayments, maturities and calls of investment securities available-for-sale	208,074	516,890
Proceeds from repayments, maturities and calls of investment securities held-to-maturity	50,973	131,961
Redemptions of Federal Home Loan Bank stock	8,354	5,023
Net decrease in loans	(274,907)	(926)
Purchase of premises and equipment	(2,631)	(1,615)
Proceeds from sale of other real estate owned	6,631	21,698
Net increase in investment in affordable housing	(3,441)	(1,427)
Net cash provided by investing activities	42,416	66,022
Cash Flows from Financing Activities
Net increase in deposits	326,597	155,248
Net decrease in federal funds purchased and securities sold under agreements to repurchase	(300,000)
Advances from Federal Home Loan Bank	643,478	260,000
Repayment of Federal Home Loan Bank borrowings	(663,000)	(463,800)
Cash dividends paid	(6,231)	(8,024)
Redemption of series B preferred stock	(129,000)
Repayment of other borrowings		(880)
Proceeds from shares issued under Dividend Reinvestment Plan	136	134
Proceeds from exercise of stock options		647
Excess tax short-fall from share-based payment arrangements	(80)	(565)
Net cash used in financing activities	(128,100)	(57,240)
(Decrease)/increase in cash and cash equivalents	(11,906)	16,856
Cash and cash equivalents, beginning of the period	144,909	117,888
Cash and cash equivalents, end of the period	133,003	134,744
Cash paid during the period:
Interest	44,472	58,516
Income taxes paid/(refund)	28,212	(2,717)
Non-cash investing and financing activities:
Net change in unrealized holding (loss)/gain on securities available-for-sale, net of tax	(15,538)	5,044
Transfers investment securities to available-for-sale from held-to-maturity	722,466
Transfers to other real estate owned from loans held for investment	8,016	13,216
Loans transferred from held for investment to held for sale, net		15,986
Loans to facilitate the sale of other real estate owned	$ 75	$ 1,523