Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Operating activities:
Net income	$ 22,085	$ 18,498
Adjustments to reconcile net income to net cash and cash equivalents provided by operating activities:
Depreciation and amortization of bank premises and equipment	5,005	4,846
Other-than-temporary impairment recognized in earnings	400
Amortization, net	5,300	4,885
Provision for loan losses	14,400	14,868
Decrease (increase) in loans held for sale, net	12,188	(30,101)
(Gains) losses on the sale of investment securities	(483)	(62)
Losses (gains) on sales of other real estate owned and premises, net	972	(376)
Stock-based compensation expense	467	567
Decrease in other assets	4,263	1,021
Increase in other liabilities	11,048	3,874
Net cash and cash equivalents provided by operating activities	75,645	18,020
Investing activities:
Purchases of securities available for sale	(130,160)	(141,868)
Proceeds from sales of securities available for sale	18,365	106,549
Proceeds from maturities, calls and paydowns of securities available for sale	87,585	85,153
Net decrease (increase) in loans	69,306	(6,427)
Sales of bank premises and equipment and OREO, net	6,815	6,986
Cash paid in branch acquisition	(26,437)
Cash received in acquisitions	230	137,460
Net cash and cash equivalents provided by investing activities	25,704	187,853
Financing activities:
Net increase in noninterest-bearing deposits	53,459	30,440
Net decrease in interest-bearing deposits	(37,511)	(80,932)
Net decrease in short-term borrowings	(22,517)	(114,858)
Net (increase) decrease in long-term borrowings	366	(925)
Cash dividends paid-common stock	(5,460)	(4,667)
Cash dividends paid-preferred stock	(1,386)	(997)
Tax benefit from the exercise of equity-based awards	1	3
Proceeds from the issuance of common stock	323	290
Net cash and cash equivalents used in financing activities	(12,725)	(171,646)
Increase in cash and cash equivalents	88,624	34,227
Cash and cash equivalents at beginning of the period	61,153	45,911
Cash and cash equivalents at end of the period	149,777	80,138
Supplemental Disclosure of Cash Flow Information
Interest	25,265	28,291
Income taxes	4,238	8,672
Supplemental Schedule of Noncash Activities
Unrealized gains on securities available for sale	15,834	11,569
Unrealized loss on cash flow hedge	(2,826)	(2,858)
Transfer of loans to other real estate owned, net	9,236	11,851
Transactions related to acquisitions
Loans	70,817	981,541
Securities		218,676
Other assets	4,324	78,542
Noninterest bearing deposits	4,366	171,117
Interest bearing deposits	44,503	1,037,206
Borrowings		75,789
Other liabilities	65	1,832
Common Stock [Member]
Supplemental Schedule of Noncash Activities
Stock issued for acquisition		96,083
Preferred Stock [Member]
Supplemental Schedule of Noncash Activities
Stock issued for acquisition		$ 34,192