Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Operating Activities
Net income	$ 82,583	$ 75,476
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	23,631	37,752
Depreciation and amortization	18,523	18,626
Net amortization of securities	6,092	2,087
Securities gains, net	(91)	(2,228)
Gains on sales of loans, net	(7,320)	(9,562)
Decrease in FDIC indemnification asset	117	0
Bargain purchase gain on acquisition	(7,456)	0
Deferred income tax benefit	(6,735)	(11,460)
Proceeds from sales of loans held for sale	664,099	792,321
Purchases and originations of loans held for sale	(692,958)	(810,356)
Originations and sales of mortgage servicing rights, net	(9,581)	(11,071)
Net decrease in other assets	40,930	23,720
Net decrease in other liabilities	(3,898)	(11,163)
Other operating activities, net	25,278	32,878
Net cash provided by operating activities	133,214	127,020
Investing Activities
Proceeds from calls and maturities of securities held to maturity	69,874	64,208
Proceeds from calls and maturities of securities available for sale	482,918	405,974
Proceeds from sales of securities available for sale	22,996	65,074
Purchases of securities available for sale	(747,383)	(688,766)
Net decrease (increase) in federal funds sold and securities purchased under reverse repurchase agreements	3,963	(281)
Net decrease in loans	227,687	222,924
Purchases of premises and equipment	(8,393)	(4,924)
Proceeds from sales of premises and equipment	536	22
Proceeds from sales of other real estate	36,277	40,921
Net cash received in business combination	78,896	0
Net cash provided by investing activities	167,371	105,152
Financing Activities
Net increase (decrease) in deposits	320,808	(163,129)
Net decrease in federal funds purchased and securities sold under repurchase agreements	(123,466)	(19,967)
Net decrease in short-term borrowings	(369,765)	(24,815)
Payments from calls of long-term FHLB advances	(153)	0
Common stock dividends	(44,614)	(44,473)
Common stock issued-net, long-term incentive plans	(360)	1,472
Excess tax benefit from stock-based compensation arrangements	553	1,357
Net cash used in financing activities	(216,997)	(249,555)
Increase (decrease) in cash and cash equivalents	83,588	(17,383)
Cash and cash equivalents at beginning of period	161,544	213,519
Cash and cash equivalents at end of period	$ 245,132	$ 196,136