Consolidated Statements Of Cash Flows (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 101,891,000	$ 74,496,000	$ 28,326,000
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred income tax expense	6,421,000	2,000,000	4,393,000
Amortization of investment premiums, net	45,082,000	36,086,000	20,464,000
Gain on sale of investment securities, net	(4,023,000)	(7,735,000)	(2,326,000)
Other-than-temporary impairment on investment securities held to maturity	155,000	359,000	414,000
Loss on sale of non-covered other real estate owned	2,349,000	1,743,000	4,023,000
Gain on sale of covered other real estate owned	(1,236,000)	(1,228,000)	(4,113,000)
Valuation adjustment on non-covered other real estate owned	6,896,000	8,947,000	4,074,000
Valuation adjustment on covered other real estate owned	4,646,000	8,709,000	1,941,000
Provision for non-covered loan and lease losses	21,796,000	46,220,000	113,668,000
Provision for covered loan and lease losses	7,405,000	16,141,000	5,151,000
Bargain purchase gain on acquisition			(6,437,000)
Proceeds from bank owned life insurance	1,870,000	818,000	14,000
Change in FDIC indemnification asset	15,234,000	6,168,000	16,445,000
Depreciation, amortization and accretion	16,040,000	13,151,000	9,199,000
Increase in mortgage servicing rights	(17,710,000)	(6,720,000)	(5,645,000)
Change in mortgage servicing rights carried at fair value	8,466,000	2,990,000	3,878,000
Change in junior subordinated debentures carried at fair value	2,175,000	2,217,000	(4,978,000)
Stock-based compensation	4,041,000	3,785,000	3,505,000
Net (increase) decrease in trading account assets	(1,438,000)	715,000	(751,000)
Gain on sale of loans	(91,945,000)	(26,838,000)	(18,794,000)
Change in loans held for sale carried at fair value	(13,965,000)	(3,435,000)	(247,000)
Origination of loans held for sale	(2,022,195,000)	(821,744,000)	(702,449,000)
Proceeds from sales of loans held for sale	1,910,071,000	828,952,000	678,990,000
Excess tax benefits from the exercise of stock options	(52,000)	(6,000)	(7,000)
Change in other assets and liabilities:
Net decrease (increase) in other assets	2,256,000	(18,616,000)	46,997,000
Net increase in other liabilities	22,255,000	15,177,000	2,914,000
Net cash provided by operating activities	26,485,000	182,352,000	198,649,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of investment securities available for sale	(994,574,000)	(1,190,686,000)	(1,498,224,000)
Purchases of investment securities held to maturity	(931,000)	(1,573,000)
Proceeds from investment securities available for sale	1,481,600,000	927,276,000	408,670,000
Proceeds from investment securities held to maturity	1,304,000	1,637,000	1,675,000
Redemption of restricted equity securities	1,629,000	1,894,000	472,000
Net non-covered loan and lease (originations) paydowns	(587,396,000)	(327,032,000)	146,252,000
Net covered loan and lease paydowns	114,815,000	119,772,000	119,941,000
Proceeds from sales of non-covered loans	14,242,000	11,185,000	38,744,000
Proceeds from insurance settlement on loss of property due to fire	1,425,000
Proceeds from fee on termination of merger transaction	1,600,000
Proceeds from disposals of furniture and equipment	2,029,000	921,000	1,237,000
Purchases of premises and equipment	(22,817,000)	(33,974,000)	(47,559,000)
Net proceeds from FDIC indemnification asset	29,478,000	54,881,000	48,443,000
Proceeds from sales of non-covered other real estate owned	27,093,000	35,340,000	25,124,000
Proceeds from sales of covered other real estate owned	12,694,000	17,615,000	14,598,000
Proceeds from sale of acquired insurance portfolio			5,150,000
Cash acquired in merger, net of cash consideration paid	39,328,000		179,046,000
Net cash provided (used) by investing activities	121,519,000	(382,744,000)	(556,431,000)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net (decrease) increase in deposit liabilities	(107,445,000)	(196,063,000)	847,895,000
Net increase in securities sold under agreements to repurchase	12,470,000	50,846,000	28,579,000
Repayment of term debt	(55,404,000)	(4,993,000)	(165,789,000)
Proceeds from issuance of preferred stock			198,289,000
Redemption of preferred stock			(214,181,000)
Repurchase of warrants issued to U.S. Treasury			(4,500,000)
Net proceeds from issuance of common stock			89,786,000
Dividends paid on preferred stock			(3,686,000)
Dividends paid on common stock	(46,201,000)	(25,317,000)	(20,626,000)
Excess tax benefits from stock based compensation	52,000	6,000	7,000
Proceeds from stock options exercised	981,000	308,000	1,004,000
Retirement of common stock	(7,436,000)	(29,754,000)	(284,000)
Net cash (used) provided by financing activities	(202,983,000)	(204,967,000)	756,494,000
Net (decrease) increase in cash and cash equivalents	(54,979,000)	(405,359,000)	398,712,000
Cash and cash equivalents, beginning of year	598,766,000	1,004,125,000	605,413,000
Cash and cash equivalents, end of year	543,787,000	598,766,000	1,004,125,000
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Interest	52,198,000	78,690,000	99,556,000
Income taxes	44,350,000	47,608,000	285,000
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Change in unrealized gains on investment securities available for sale, net of taxes	(9,616,000)	8,620,000	(613,000)
Change in unrealized losses on investment securities held to maturity related to factors other than credit, net of taxes	188,000	209,000	603,000
Cash dividend declared on common stock and payable after period-end		7,890,000	5,745,000
Transfer of non-covered loans to non-covered other real estate owned	17,699,000	47,414,000	41,491,000
Transfer of covered loans to covered other real estate owned	6,987,000	15,271,000	15,350,000
Transfer of covered loans to non-covered loans	16,166,000	12,263,000
Transfer from FDIC indemnification asset to due from FDIC and other	23,057,000	49,156,000	84,660,000
Receivable from sales of noncovered other real estate owned and loans		1,100,000	45,000
Receivable from sales of covered other real estate owned		547,000
Conversion of preferred stock to common stock			198,289,000
Acquisitions:
Assets acquired	317,774,000		1,512,048,000
Liabilities assumed	$ 317,774,000		$ 1,505,611,000