Consolidated Statements Of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Operating Activities:
Net income	$ 34,500	$ 32,052
Adjustments to reconcile net income to net cash provided by operating activities
Provision for credit losses	1,880	15,687
Depreciation and amortization	7,753	6,782
Stock-based compensation expense	1,681	2,413
Tax benefit from stock-based compensation arrangements	3	200
Excess tax benefits from stock-based compensation arrangements	(156)	(222)
Net amortization of premium on securities	233	3,424
Mortgage servicing rights fair value change, net	253	(273)
Originations and purchases of mortgage loans held-for-sale	(527,272)	(974,432)
Proceeds from sales of mortgage loans held-for-sale	658,588	1,033,129
Increase in trading securities, net	(571)	(453)
Net decrease (increase) in brokerage customer receivables	4,069	(750)
Gains on mortgage loans sold	(12,220)	(27,419)
Losses (gains) on available-for-sale securities, net	33	(251)
Loss on sales of premises and equipment, net	795	1
Net loss (gains) on sales and fair value adjustments of other real estate owned	2,460	(2,658)
Decrease in accrued interest receivable and other assets, net	27,584	32,068
Decrease in accrued interest payable and other liabilities, net	(37,348)	(19,617)
Net Cash Provided by Operating Activities	162,265	99,681
Investing Activities:
Proceeds from maturities of available-for-sale securities	98,007	67,941
Proceeds from sales of available-for-sale securities	14,800	41,056
Purchases of available-for-sale securities	(349,979)	(192,379)
Divestiture of operations	0	(149,100)
Proceeds from sales of other real estate owned	20,362	30,641
Proceeds received from the FDIC related to reimbursements on covered assets	9,669	13,932
Net (increase) decrease in interest-bearing deposits with banks	(45,390)	350,441
Net increase in loans	(227,040)	(52,143)
Purchases of premises and equipment, net	(7,596)	(6,508)
Net Cash (Used for) Provided by Investing Activities	(487,167)	103,881
Financing Activities:
Increase (decrease) in deposit accounts	460,551	(314,618)
(Decrease) increase in other borrowings, net	(24,018)	11,576
Decrease in Federal Home Loan Bank advances, net	(30,000)	0
Excess tax benefits from stock-based compensation arrangements	156	222
Issuance of common shares resulting from exercise of stock options, employee stock purchase plan and conversion of common stock warrants	3,668	1,354
Common stock repurchases	(380)	(349)
Dividends paid	(6,201)	(3,574)
Net Cash Provided by (Used for) Financing Activities	403,776	(305,389)
Net Increase (Decrease) in Cash and Cash Equivalents	78,874	(101,827)
Cash and Cash Equivalents at Beginning of Period	263,864	315,028
Cash and Cash Equivalents at End of Period	$ 342,738	$ 213,201