Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 18,495	$ 15,328
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	8,695	3,196
Provision for loan losses	10,015	8,822
Losses on other real estate owned	1,502	473
Deferred tax (benefit)	(2,035)	(1,851)
(Increase) in cash surrender value of life insurance contracts	(6,171)	(3,468)
Loss (gain) on disposal of other assets	78	(597)
Net decrease on loans originated for sale	29,894	6,612
Net amortization of securities premium/discount	13,603	1,767
Amortization of intangible assets	8,304	620
Stock-based compensation expense	2,424	1,094
(Decrease) in interest payable and other liabilities	(21,090)	(2,570)
(Increase) in FDIC indemnification asset	(9,685)	(14,125)
Decrease (increase) in other assets	24,524	(11,164)
Other, net	(15)	(100)
Net cash provided by operating activities	78,538	4,037
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sales of securities available for sale	477
Proceeds from maturities of securities available for sale	348,222	98,488
Purchases of securities available for sale	(10,013)	(200,334)
Purchases of investment securitites held to maturity	(253,114)
Net decrease (increase) in interest-bearing time deposits	176,408	(110,463)
Net (increase) in federal funds sold and short-term investments	(494)	(9,946)
Net (increase) decrease in loans	45,143	114,748
Purchases of property and equipment	(3,756)	(33,197)
Proceeds from sales of property and equipment	1,799	1,612
Proceeds from sales of other real estate	24,457	3,635
Net cash provided by (used in) investing activities	329,129	(135,457)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net (decrease) in deposits	(280,813)	(78,409)
Net (decrease) increase in short-term borrowings	(194,165)	51,489
Proceeds (repayments) of long-term debt	6,382	(11)
Repayments of short-term debt		(58)
Dividends paid	(20,586)	(8,961)
Proceeds from exercise of stock options	1,367	72
Proceeds from stock offering		190,918
Excess tax benefit from stock option exercises	15	74
Net cash (used in) provided by financing activities	(487,800)	155,114
NET (DECREASE) INCREASE IN CASH AND DUE FROM BANKS	(80,133)	23,694
CASH AND DUE FROM BANKS, BEGINNING	437,947	139,687
CASH AND DUE FROM BANKS, ENDING	357,814	163,381
SUPPLEMENTAL INFORMATION FOR NON-CASH INVESTING AND FINANCING ACTIVITIES
Assets acquired in settlement of loans	84,710	13,086
Transfers from available for sale securities to held to maturity securities	$ 1,484,957