Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash Flows From Operating Activities
Net Income (Loss)	$ 60,016	$ 46,143	$ 48,037
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan and lease losses and losses on covered loans	(101)	39,367	5,752
Stock-based compensation expense	2,844	1,622	1,635
Depreciation, amortization and accretion	40,431	57,305	46,121
Net realized gain on FDIC assisted bank acquisitions	0	0	(1,830)
Net realized gain on sale of securities	(462)	(3,733)	2,816
Net realized (gain) loss on sale of other assets	(48)	(456)	79
Net realized (gain) loss on sale of other real estate owned	(10,539)	(11,634)	(9,310)
Gain on termination of cash flow hedging instruments	0	0	(222)
Write-down on other real estate owned	2,035	8,300	6,307
Deferred income tax expense (benefit)	5,413	(3,656)	(3,783)
Net change in:
Loans held for sale	1,828	(415)	(1,394)
Interest receivable	(7,938)	1,019	(1,243)
Interest payable	(122)	(629)	(403)
Other assets	(3,385)	(2,113)	(19,248)
Other liabilities	(10,336)	3,779	13,110
Net cash provided by operating activities	79,636	134,899	86,424
Cash Flows From Investing Activities
Loans originated and acquired, net of principal collected	161,827	92,088	110,577
Purchases of securities available for sale	(457,985)	(322,342)	(453,043)
Purchases of premises and equipment	(13,133)	(17,137)	(15,088)
Proceeds from FDIC reimbursement on loss-sharing asset	9,246	54,649	54,200
Proceeds from sales of securities available for sale	166,881	95,165	72,523
Proceeds from principal repayments and maturities of securities available for sale	293,940	236,749	148,583
Proceeds from sales of loans held for investment and other assets	4,031	4,414	46
Proceeds from sales of covered other real estate owned	22,046	33,315	20,619
Proceeds from sales of other real estate and other personal property owned	14,407	15,689	12,278
Proceeds from termination of trust subsidiaries	0	0	774
Capital improvements on other real estate properties	(3,577)	(11)	(735)
Increase (decrease) in Small Business Administration secured borrowings	0	0	(642)
Payments to Acquire Intangible Assets	(919)	0	0
Net cash acquired in business combinations	(154,170)	0	247,792
Net cash (used in) provided by investing activities	(281,060)	8,403	(23,270)
Cash Flows From Financing Activities
Net increase (decrease) in deposits	33,983	226,556	(204,586)
Proceeds from exercise of stock options	1,092	713	848
Proceeds from excess tax benefit from stock-based compensation	1,203	0	98
Proceeds from Federal Home Loan Bank advances	1,215,100	100	100
Proceeds from Federal Reserve Bank borrowings	50	100	100
Repayment of Federal Home Loan Bank advances	(1,313,000)	(112,210)	(42,989)
Repayment of Federal Reserve Bank borrowings	(50)	(100)	(100)
Payment of preferred stock dividends	(32)	0	0
Payment of common stock dividends	(19,858)	(38,824)	(10,660)
Repayment of long-term subordinated debt	(51,000)	0	(25,774)
Payment for purchase and retirement of common stock	(429)	0	(32)
Net cash used in financing activities	(132,941)	76,335	(282,995)
Increase (decrease) in cash and cash equivalents	(334,365)	219,637	(219,841)
Cash and cash equivalents at beginning of period	513,926	294,289	514,130
Cash and cash equivalents at end of period	179,561	513,926	294,289
Supplemental Information:
Cash paid for interest	5,962	10,206	14,938
Cash paid for income tax	26,754	11,927	23,025
Non-cash investing activities
Assets acquired in FDIC assisted acquisitions (excluding cash and cash equivalents)	0	0	485,870
Liabilities assumed in FDIC assisted acquisitions	0	0	731,832
Loans transferred to other real estate owned	18,100	21,627	24,357
Stock Issued	$ 276,181	$ 0	$ 0