Condensed Consolidated Statements of Cash Flow (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 39,594	$ 34,023
Adjustments to reconcile to net cash provided by operating activities:
Provision for loan losses	654	3,686
Depreciation and amortization	7,981	7,121
Net amortization of securities premiums and discounts	1,093	3,339
Realized securities gains	(4,643)	(1,374)
Gain on sales of loans	(2,075)	(1,401)
Cash receipts from the sale of loans originated for sale	169,065	117,751
Cash disbursements for loans originated for sale	(170,446)	(117,667)
Deferred income tax provision (benefit)	426	(3,476)
Gains on other assets	(323)	(1,066)
Decrease in interest receivable	1,996	4,879
Increase in interest payable	(559)	(431)
Amortization of stock based compensation arrangements	1,189	1,017
Other, net	3,936	6,205
Net cash provided by operating activities	47,888	52,606
INVESTING ACTIVITIES
Net cash and due from banks provided by acquisitions		32,186
Net decrease in federal funds sold	400	41,207
Purchases of securities:
Held for investment	(2,525)	(6,400)
Available for sale	(58,240)	(166,140)
Maturities of securities:
Held for investment	5,845	5,731
Available for sale	116,831	264,978
Proceeds from sales and calls of securities:
Held for investment	2,417	2
Available for sale	9,469	79,770
Purchases of loans	(22,215)	(28,404)
Proceeds from sales of loans	32,569	9,298
Net other increase in loans	(112,844)	(44,259)
Purchases of premises, equipment and computer software	(9,290)	(12,439)
Proceeds from the sale of other assets	8,245	14,125
Net cash ( used by ) provided by investing activities	(29,338)	189,655
FINANCING ACTIVITIES
Net increase in demand, transaction and savings deposits	274,556	250,170
Net decrease in time deposits	(58,786)	(43,780)
Net decrease in short-term borrowings	(2,609)	(5,857)
Paydown of long-term borrowings	(7,221)	(15,968)
Redemption of junior subordinated debentures	(9,279)
Issuance of common stock	2,188	946
Common stock acquired	(256)	(10,052)
Cash dividends paid	(12,262)	(11,507)
Net cash provided by financing activities	186,331	163,952
Net increase in cash, due from banks and interest bearing deposits	204,881	406,213
Cash, due from banks and interest bearing deposits at the beginning of the period	1,707,733	1,204,079
Cash, due from banks and interest bearing deposits at the end of the period	1,912,614	1,610,292
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid during the period for interest	14,366	20,192
Cash paid during the period for income taxes	$ 21,475	$ 21,802