Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash Flows From Operating Activities
Net Income	$ 62,654	$ 40,043
Adjustments to reconcile net income to net cash provided by operating activities
Provision for loan and lease losses and losses on covered loans	5,019	3,581
Stock-based compensation expense	2,041	1,881
Depreciation, amortization and accretion	21,956	30,216
Net realized gain on sale of securities	552	462
Net realized gain on sale of other assets	566	(107)
Net realized (gain) loss on sale of other real estate owned	(4,955)	(8,745)
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	(565)	0
Write-down on other real estate owned	3,220	1,929
Net change in:
Loans held for sale	(214)	1,723
Interest receivable	(3,092)	(9,846)
Interest payable	(61)	(88)
Other assets	(5,567)	1,805
Other liabilities	6,749	(2,114)
Net cash provided by operating activities	87,199	59,816
Cash Flows From Investing Activities
Loans originated and acquired, net of principal collected	310,185	166,905
Purchases of securities available for sale	(127,728)	(292,744)
Purchases of premises and equipment	(10,530)	(10,087)
Proceeds from FDIC reimbursement on loss-sharing asset	4,607	7,871
Proceeds from sales of securities available for sale	55,834	166,881
Proceeds from principal repayments and maturities of securities available for sale	134,882	241,388
Proceeds from Sales of Assets, Investing Activities	1,470	1,117
Proceeds from sales of covered other real estate owned	8,161	19,222
Proceeds from sales of other real estate and other personal property owned	16,527	10,779
Payment to FDIC Related to Loss-Sharing Asset	(3,384)	0
Payments to Acquire Intangible Assets	0	919
Disposal Group, Not Discontinued Operation, Cash paid in disposal of assets	(16,788)	0
Payments to Acquire Businesses, Net of Cash Acquired	0	(154,170)
Payments for (Proceeds from) Other Investing Activities	0	522
Net cash provided by (used in) investing activities	(247,134)	(178,089)
Cash Flows From Financing Activities
Net increase (decrease) in deposits	307,103	23,475
Proceeds from Federal Home Loan Bank advances	1,308,000	1,144,100
Proceeds from Federal Reserve Bank borrowings	800	50
Proceeds from exercise of stock options	915	1,154
Repayment of Federal Home Loan Bank advances	(1,338,000)	(1,244,000)
Repayment of Federal Reserve Bank borrowings	(800)	(50)
Payment of common stock dividends	(33,525)	(14,219)
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	(66)	(20)
Repayments of Subordinated Debt	0	51,000
Purchase and retirement of common stock	605	391
Net cash used by financing activities	243,822	(140,901)
Increase (Decrease) in cash and cash equivalents	83,887	(259,174)
Cash and cash equivalents at beginning of period	179,561	513,926
Cash and cash equivalents at end of period	263,448	254,752
Supplemental Information:
Cash paid for interest	2,922	4,830
Cash paid for income tax	11,230	20,221
Non-cash investing and financing activities
Loans transferred to other real estate owned	8,930	17,279
Share-based consideration issued for acquisitions	$ 0	$ 276,181