Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash Flows From Operating Activities:
Net income	$ 20,221	$ 6,680
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	14,500	26,700
Gains on sales of loans	(2,208)	(2,173)
Proceeds from sales of loans	101,586	104,831
Loans originated for sale	(85,773)	(103,842)
Proceeds from sale of trading securities		1,083
Net gains on sales of other real estate and repossessed assets	(703)	(915)
Net losses on disposal of premises and equipment and branch bank property	17	350
Depreciation of premises and equipment	4,076	3,667
Amortization of intangible assets	1,904	1,324
Net amortization of premiums and discounts on investment securities	1,713	1,208
Share-based compensation expense	374	899
Net decrease in interest receivable and other assets	10,477	4,531
Net increase (decrease) in interest payable and other liabilities	(3,166)	1,217
Net cash provided by operating activities	63,018	45,560
Investment securities--available-for-sale:
Proceeds from maturities, calls and principal reductions	185,803	163,935
Purchases	(220,747)	(149,449)
Investment securities--held-to-maturity:
Proceeds from maturities, calls and principal reductions	30,763	21,510
Purchases	(55,334)	(55,552)
Other securities:
Proceeds from redemption	1,561
Net increase in loans	(86,502)	(52,817)
Proceeds from sales of other real estate and repossessed assets	8,767	9,585
Purchases of premises and equipment and branch bank property, net	(3,384)	(4,016)
Cash acquired, net of cash paid, in business combination		17,177
Net cash used in investing activities	(139,073)	(49,627)
Cash Flows From Financing Activities:
Net increase (decrease) in noninterest-bearing and interest-bearing demand deposits and savings accounts	(60,655)	110,549
Net decrease in time deposits	(20,134)	(22,733)
Net increase in securities sold under agreements to repurchase	33,897	1,703
Repayment of FHLB advances	(2,202)	(39,228)
Cash dividends paid	(10,982)	(10,267)
Proceeds from directors' stock purchase plan and exercise of stock options	245	292
Net cash provided by (used in) financing activities	(59,831)	40,316
Net increase (decrease) in cash and cash equivalents	(135,886)	36,249
Cash and cash equivalents at beginning of period	536,165	360,709
Cash and Cash Equivalents at End of Period	400,279	396,958
Supplemental Disclosure of Cash Flow Information:
Interest paid	17,015	20,371
Federal income taxes paid (received)	(849)	3,900
Loans transferred to other real estate and repossessed assets	5,857	10,550
Business combination:
Fair value of tangible assets acquired (noncash)		753,671
Goodwill and identifiable intangible assets acquired		49,555
Liabilities assumed		736,706
Common stock issued		$ 83,697