Consolidated Statements of Cash Flows (USD $)	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash Flows from Operating Activities
Net income	$ 31,953,000	$ 19,833,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	9,987,000	6,093,000
Amortization of purchase accounting adjustments	(18,895,000)	(9,952,000)
Provision for loan losses	11,752,000	15,461,000
Noncash compensation expense	4,897,000	4,722,000
Loss on sale of assets	49,000	27,000
Gain on sale of available for sale investments	(3,702,000)	(1,427,000)
Gain on sale of OREO	(2,614,000)	(1,349,000)
Loss on abandonment of fixed assets	2,743,000
Amortization of premium/discount on investments	9,949,000	8,846,000
Derivative losses on swaps		2,000
Provision for deferred income taxes	712,000	463,000
Mortgage loans held for sale
Originations	(1,042,020,000)	(643,456,000)
Proceeds from sales	1,046,161,000	670,105,000
Gain on sale of loans, net	(31,697,000)	(18,281,000)
Cash retained from tax benefit associated with share-based payment arrangements	(285,000)	(1,378,000)
Increase in other assets	(11,609,000)	(23,018,000)
Other operating activities, net	11,922,000	15,907,000
Net Cash Provided by Operating Activities	19,303,000	42,598,000
Cash Flows from Investing Activities
Proceeds from sales of securities available for sale	82,392,000	20,410,000
Proceeds from maturities, prepayments and calls of securities available for sale	528,943,000	228,042,000
Purchases of securities available for sale	(697,042,000)	(130,559,000)
Proceeds from maturities, prepayments and calls of securities held to maturity	27,805,000	19,563,000
Purchases of securities held to maturity	(24,056,000)	(7,203,000)
FDIC reimbursement of recoverable covered asset losses	85,072,000	89,604,000
Increase in loans receivable, net	(351,982,000)	(275,961,000)
Proceeds from sale of premises and equipment	354,000	1,926,000
Purchases of premises and equipment	(17,558,000)	(25,345,000)
Proceeds from disposition of real estate owned	56,812,000	29,614,000
Investment in new market tax credit entities		(9,425,000)
Cash received in excess of cash paid for acquisition		80,490,000
Other investing activities, net	(998,000)	(1,818,000)
Net Cash (Used in) Provided by Investing Activities	(310,258,000)	19,338,000
Cash Flows from Financing Activities
Increase (decrease) in deposits	127,846,000	(42,552,000)
Net change in short-term borrowings, net of borrowings acquired	245,225,000	(39,082,000)
Proceeds from long-term debt	9,858,000	1,668,000
Repayments of long-term debt	(43,043,000)	(45,326,000)
Dividends paid to shareholders	(20,025,000)	(18,312,000)
Proceeds from sale of treasury stock for stock options exercised	1,337,000	5,739,000
Payments to repurchase common stock	(3,778,000)	(1,423,000)
Cash retained from tax benefit associated with share-based payment arrangements	285,000	1,378,000
Net Cash Provided by (Used in) Financing Activities	317,705,000	(137,910,000)
Net Increase (Decrease) In Cash and Cash Equivalents	26,750,000	(75,974,000)
Cash and Cash Equivalents at Beginning of Period	573,296,000	337,778,000
Cash and Cash Equivalents at End of Period	600,046,000	261,804,000
Supplemental Schedule of Noncash Activities
Acquisition of real estate in settlement of loans	62,306,000	56,122,000
Common stock issued in acquisition		181,140,000
Supplemental Disclosures Cash paid for:
Interest on deposits and borrowings	34,388,000	43,330,000
Income taxes, net	$ 10,833,000	$ 30,225,000