Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 104,783	$ 57,793
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	25,228	15,730
Provision for loan losses	26,141	27,221
Losses on other real estate owned	17,901	1,586
Deferred tax provision	35,557	37,574
Increase in cash surrender value of life insurance contracts	(12,759)	(8,694)
(Gain) loss on sales of securities available for sale, net	(929)	71
Gain on disposal of other assets	(921)	(597)
Net decrease in loans originated for sale	21,989	6,479
Net amortization of securities premium/discount	38,241	14,400
Amortization of intangible assets	24,390	9,332
Stock-based compensation expense	7,718	4,738
Decrease in interest payable and other liabilities	(30,059)	(19,426)
Decrease in FDIC indemnification asset	28,440	106,601
Decrease in other assets	34,322	23,892
Other, net	(292)	53
Net cash provided by operating activities	319,750	276,753
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sales of securities available for sale	37,661	323,569
Proceeds from maturities of securities available for sale	880,438	586,923
Purchases of securities available for sale	(208,775)	(1,242,599)
Proceeds from maturities of securities held to maturity	263,357
Purchases of investment securities held to maturity	(560,435)
Net decrease in interest-bearing bank deposits	865,590	194,753
Net (increase) decrease in federal funds sold and short term investments	(1,228)	271,423
Net (increase) decrease in loans	(324,495)	225,544
Purchases of property, equipment and intangible assets	(34,815)	(62,010)
Proceeds from sales of property and equipment	5,403	9,290
Proceeds from life contracts	516
Cash paid for acquisition, net of cash received		(74,736)
Proceeds from sales of other real estate	76,427	52,994
Net cash paid for divestiture of branches		(114,645)
Net cash provided by investing activities	999,644	170,506
CASH FLOWS FROM FINANCING ACTIVITIES:
Net decrease in deposits	(940,629)	(486,114)
Net decrease in short-term borrowings	(295,820)	(28,067)
Repayments of long-term debt	(52,065)	(6,186)
Issuance of long term debt	6,502	142,461
Dividends paid	(61,916)	(50,051)
Proceeds from exercise of stock options	1,210	710
Proceeds from stock offering		213,994
Net cash used in financing activities	(1,342,718)	(213,253)
NET (DECREASE) INCREASE IN CASH AND DUE FROM BANKS	(23,324)	234,006
CASH AND DUE FROM BANKS, BEGINNING	437,947	139,687
CASH AND DUE FROM BANKS, ENDING	414,623	373,693
SUPPLEMENTAL INFORMATION FOR NON-CASH INVESTING AND FINANCING ACTIVITIES
Assets acquired in settlement of loans	63,917	57,402
Transfers from available for sale securities to held to maturity securities	1,523,585
Fair value of assets acquired		11,235,000
Liabilities assumed		(10,133,000)
Net identifiable assets acquired		$ 1,102,000