Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 151,742	$ 76,759	$ 52,206
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	32,856	24,605	13,526
Provision for loan losses	54,192	38,732	65,991
Losses (gains) on other real estate owned	8,353	4,922	(1,960)
Deferred tax expense (benefit)	32,465	8,703	(11,602)
Increase in cash surrender value of life insurance contracts	(12,807)	(12,169)	(8,022)
(Gain) loss on sales of securities, net	(1,552)	91
Loss (gain) on disposal of other assets	51	(424)	(316)
Net decrease (increase) in loans originated for sale	21,991	(1,560)	22,032
Net amortization of securities premium/discount	49,887	29,523	7,071
Amortization of intangible assets	32,067	16,551	2,728
Stock-based compensation expense	11,019	7,196	4,077
(Decrease) in interest payable and other liabilities	(53,703)	(99,986)	(12,405)
Funds collected under FDIC loss share agreements	114,976	181,753	1,753
Increase in FDIC loss share receivable	(50,284)	(65,502)	(5,283)
Decrease in other assets	52,155	63,956	65,953
Other, net	(376)	(104)	(951)
Net cash provided by operating activities	443,032	273,046	194,798
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sales of securities available for sale	48,336	342,864
Proceeds from maturities of securities available for sale	1,081,193	998,726	603,102
Purchases of securities available for sale	(285,825)	(1,732,757)	(489,835)
Proceeds from maturities of securities held to maturity	432,331
Purchases of securities held to maturity	(560,324)
Net (increase) decrease in interest-bearing bank deposits	(314,763)	(104,647)	218,015
Net (increase) decrease in federal funds sold and short term investments	(1,006)	281,639	(59,573)
Net (increase) decrease in loans	(507,530)	86,057	40,400
Purchases of property, equipment and intangible assets	(42,979)	(72,975)	(21,899)
Proceeds from sales of property and equipment	6,270	9,326	2,220
Cash paid for acquisition, net of cash received		(74,736)
Proceeds from sales of other real estate	120,083	80,125	41,945
Net cash paid for divestiture of branches		(114,645)
Other, net	6,481
Net cash provided by (used in) investing activities	(17,733)	(301,023)	334,375
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase (decrease) in deposits	30,609	(65,298)	(420,093)
Net increase (decrease) in short-term borrowings	(405,321)	113,353	(140,031)
Repayments of long-term debt	(192,087)	(16,641)	(295)
Issuance of long term debt	232,720	150,317
Dividends paid	(82,690)	(70,617)	(35,721)
Proceeds from exercise of stock options	2,014	1,129	1,940
Proceeds from stock offering		213,994
Net cash provided by (used in) financing activities	(414,755)	326,237	(594,200)
NET INCREASE (DECREASE) IN CASH AND DUE FROM BANKS	10,544	298,260	(65,027)
CASH AND DUE FROM BANKS, BEGINNING	437,947	139,687	204,714
CASH AND DUE FROM BANKS, ENDING	448,491	437,947	139,687
SUPPLEMENTAL INFORMATION
Income taxes paid (refunded)	(24,237)	24,529	22,878
Interest paid	57,370	66,695	83,161
SUPPLEMENTAL INFORMATION FOR NON-CASH INVESTING AND FINANCING ACTIVITIES
Assets acquired in settlement of loans	76,128	117,690	59,758
Transfers from available for sale securities to held to maturity securities	1,523,585
Fair value of assets acquired		11,156,952
Liabilities assumed		(10,130,706)
Net identifiable assets acquired		1,026,246
Common stock issued in connection with acquisition		$ 1,308,044