Consolidated Statements Of Cash Flows (USD $) In Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010	Dec. 31, 2009
Cash Flows From Operating Activities
Net income	$ 33,449	$ 20,592
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation	5,112	4,824
Amortization and impairment of other intangible assets	3,762	3,126
Net premium amortization on investment securities	4,242	2,567
Restricted stock expense	1,471	1,142
Stock option expense	68	143
Provision for loan losses	6,519	17,281
Net securities gains	(2,165)	(9,511)
Impairment on available-for-sale securities	499	3,269	3,927	24,795
Gain on sale leasebacks	(3,273)	(3,179)
Gain on derivatives	(553)	(1,016)
Net gains on sales and write-downs of loans and other assets	(879)	(720)
Loss on extinguishment of debt	0	1,404
Increase in cash surrender value of company owned life insurance	(2,443)	(410)
Residential real estate loans originated for sale	(51,273)	(31,936)
Proceeds from sale of residential real estate loans	56,524	44,456
Decrease in interest receivable	2,175	4,153
Decrease in other assets	12,968	8,718
Increase (decrease) in accrued expenses and other liabilities	47,072	17,465
Total adjustments	79,826	61,776
Net cash flows provided by operating activities	113,275	82,368
Cash Flows From Investing Activities
Cash and cash equivalents of acquired bank	83,604	0
Purchases of investment securities available-for-sale	(446,971)	(459,572)
Purchases of investment securities held-to-maturity	0	(65,141)
Purchase of acquired security	(1,301)	0
Proceeds from the call/repurchase of FHLB stock	14,587	0
Proceeds from maturities, prepayments and calls of investment securities available-for-sale	282,800	290,365
Proceeds from sales of investment securities available-for-sale	91,372	287,771
Proceeds from maturities, prepayments and calls of investment securities held-to-maturity	73,936	20,190
Proceeds from sale of loans	4,743	3,283
Net principal collected from (loans made to) customers	59,766	141,393
Proceeds from sale of premises and equipment and other assets	342	14
Proceeds from sale leaseback of real estate	0	3,697
Purchases of premises and equipment	(2,552)	(5,508)
Net cash flows provided by investing activities	160,326	216,492
Cash Flows From Financing Activities
Noninterest-bearing demand deposits	87,724	(18,147)
Savings, NOW and money market deposits	(8,224)	(14,250)
Time deposits	(181,399)	(224,117)
Short-term borrowings	(55,556)	433
Payments for maturities on other borrowings	(403)	(50,374)
Payments related to retirement of debt	(18,333)	(50,486)
Cash dividends paid on common stock	(13,263)	(12,175)
Common stock repurchased	(333)	(482)
Proceeds from exercise of stock options, including tax benefit	140	12
Common stock issued	111	73
Net cash flows used in financing activities	(189,536)	(369,513)
Net increase (decrease) in cash and cash equivalents	84,065	(70,653)
Cash and cash equivalents at beginning of period	251,552	497,276	497,276
Cash and cash equivalents at end of period	335,617	426,623	251,552	497,276
Supplemental cash flow information:
Total interest paid	30,007	44,484
Total taxes paid (net of refunds)	$ 4,605	$ (2,825)