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	$ 32,681	$ 33,283
Adjustments to reconcile net income to net cash provided by operating activities
Provision for loan and lease losses and losses on covered loans	34,506	4,962
Stock-based compensation expense	1,152	1,163
Depreciation, amortization and accretion	45,873	35,168
Business Combination, Bargain Purchase, Gain Recognized, Amount	0	1,830
Net realized gain on sale of securities	62	0
Net realized gain on sale of other assets	(35)	(13)
Net realized (gain) loss on sale of other real estate owned	(8,604)	(7,069)
Gain on termination of cash flow hedging instruments	0	(222)
Write-down on other real estate owned	7,001	5,392
Net change in:
Loans held for sale	(1,452)	(1,814)
Interest receivable	(1,300)	(3,384)
Interest payable	(374)	(226)
Other assets	(5,223)	3,186
Other liabilities	(3,881)	1,608
Net cash provided by operating activities	100,282	70,204
Cash Flows From Investing Activities
Loans originated and acquired, net of principal collected	(72,180)	(69,420)
Purchases of securities available for sale	(87,346)	(294,678)
Purchases of premises and equipment	(12,404)	(10,619)
Proceeds from FDIC reimbursement on loss-sharing asset	49,194	51,000
Proceeds from sales of securities available for sale	3,845	0
Proceeds from principal repayments and maturities of securities available for sale	163,584	101,071
Proceeds from disposal of premises and equipment	25	59
Proceeds from sales of covered other real estate owned	25,202	14,604
Proceeds from sales of other real estate and other personal property owned	15,069	10,234
Capital improvements on other real estate properties	(11)	(726)
Decrease in Small Business Administration secured borrowings	0	(642)
Net cash acquired in business combinations	0	247,792
Net cash provided by (used in) investing activities	84,978	48,675
Cash Flows From Financing Activities
Net increase (decrease) in deposits	123,326	(215,701)
Proceeds from Federal Home Loan Bank advances	0	100
Proceeds from Federal Reserve Bank borrowings	0	100
Proceeds from exercise of stock options	713	792
Repayment of Federal Home Loan Bank advances	(5,744)	(39,447)
Repayment of Federal Reserve Bank borrowings	0	(100)
Payment of common stock dividends	(35,252)	(5,524)
Payments for purchase and retirement of common stock	0	(32)
Net decrease in other borrowings	0	(25,735)
Net cash used by financing activities	83,043	(285,547)
Increase (Decrease) in cash and cash equivalents	268,303	(166,668)
Cash and cash equivalents at beginning of period	294,289	514,130
Cash and cash equivalents at end of period	562,592	347,462
Supplemental Information:
Cash paid for interest	7,640	11,967
Cash paid for income tax	9,605	12,870
Non-cash investing activities
Assets acquired in FDIC-assisted acquisitions (excluding cash and cash equivalents)	0	485,870
Liabilities assumed in FDIC-assisted acquisitions	0	731,832
Loans transferred to other real estate owned	$ 15,024	$ 16,505