Consolidated Statements Of Cash Flows (USD $) In Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Operating Activities:
Net income	$ 58,354	$ 49,125
Adjustments to reconcile net income to net cash provided by operating activities
Provision for credit losses	83,821	95,870
Depreciation and amortization	14,128	13,426
Stock-based compensation expense	3,433	4,521
Tax benefit from stock-based compensation arrangements	183	744
Excess tax benefits from stock-based compensation arrangements	(760)	(1,020)
Net amortization of premium on securities	6,308	4,674
Mortgage servicing rights fair value change and amortization, net	3,626	3,724
Originations and purchases of mortgage loans held-for-sale	(1,662,368)	(2,495,880)
Proceeds from sales of mortgage loans held-for-sale	1,846,396	2,498,438
Bank owned life insurance income, net of claims	(1,888)	(1,593)
Decrease in trading securities, net	4,582	28,839
Net increase in brokerage customer receivables	(3,386)	(4,571)
Gain on mortgage loans sold	(25,617)	(47,283)
Gain on available-for-sale securities, net	(1,483)	(9,673)
Gain on bargain purchases	(37,974)	(43,981)	(33,300)
Loss on sales of premises and equipment, net	10	7
Decrease in accrued interest receivable and other assets, net	72,216	100,824
(Decrease) increase in accrued interest payable and other liabilities, net	(2,481)	9
Net Cash Provided by Operating Activities	357,100	196,200
Investing Activities:
Proceeds from maturities of available-for-sale securities	1,189,834	907,492
Proceeds from sales of available-for-sale securities	605,026	628,462
Purchases of available-for-sale securities	(2,015,888)	(1,609,840)
Net cash received for acquisitions	91,073	84,920
Net increase in interest-bearing deposits with banks	(211,382)	(51,588)
Net increase in loans	(520,770)	(551,016)
Purchases of premises and equipment, net	(54,769)	(15,896)
Net Cash Used for Investing Activities	(916,876)	(607,466)
Financing Activities:
Increase in deposit accounts	383,001	354,941
Increase (decrease) in other borrowings, net	180,723	(5,915)
Decrease in Federal Home Loan Bank advances, net		(44,592)
Repayment of subordinated note	(10,000)	(5,000)
Excess tax benefits from stock-based compensation arrangements	760	1,020
Issuance of common stock, net of issuance costs		210,417
Issuance of common shares resulting from exercise of stock options, employee stock purchase plan and conversion of common stock warrants	2,846	3,275
Common stock repurchases	(68)	(149)
Dividends paid	(9,344)	(17,367)
Net Cash Provided by Financing Activities	547,918	496,630
Net (Decrease) Increase in Cash and Cash Equivalents	(11,858)	85,364
Cash and Cash Equivalents at Beginning of Period	172,580	158,616	158,616
Cash and Cash Equivalents at End of Period	$ 160,722	$ 243,980	$ 172,580