Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 23,361	$ 25,503
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of investment premiums, net	11,042	10,744
Gain on sale of investment securities, net	(7)	(148)
Gain on sale of non-covered other real estate owned	(499)	(336)
Gain on sale of covered other real estate owned	(270)	(452)
Valuation adjustment on non-covered other real estate owned	369	3,523
Valuation adjustment on covered other real estate owned	554	2,906
Provision for non-covered loan and lease losses	6,988	3,167
Provision for covered loan and lease losses	232	(31)
Proceeds from bank owned life insurance	1,173	0
Change in FDIC indemnification asset	5,073	1,845
Depreciation, amortization and accretion	4,497	4,020
Increase in mortgage servicing rights	(6,403)	(2,948)
Change in mortgage servicing rights carried at fair value	1,734	922
Change in junior subordinated debentures carried at fair value	535	548
Stock-based compensation	1,185	916
Net (increase) decrease in trading account assets	564	(847)
Gain on sale of loans	(28,484)	(2,445)
Change in loans held for sale carried at fair value	10,798	(242)
Origination of loans held for sale	(471,175)	(352,522)
Proceeds from sales of loans held for sale	675,150	326,783
Excess tax benefits from the exercise of stock options	(27)	(46)
Change in other assets and liabilities:
Net decrease in other assets	12,357	15,493
Net increase in other liabilities	(14,007)	(5,554)
Net cash provided by operating activities	234,740	30,799
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of investment securities available for sale	(51,191)	(266,541)
Proceeds from investment securities available for sale	264,313	331,374
Proceeds from investment securities held to maturity	402	170
Redemption of restricted equity securities	660	128
Net non-covered loan and lease originations	(3,363)	(68,883)
Net covered loan and lease paydowns	17,346	23,956
Proceeds from sales of non-covered loans	17,515	4,428
Proceeds from disposals of furniture and equipment	112	653
Purchases of premises and equipment	(5,166)	(5,863)
Net proceeds from FDIC indemnification asset	1,710	12,649
Proceeds from sales of non-covered other real estate owned	4,284	3,892
Proceeds from sales of covered other real estate owned	3,935	5,033
Net cash used by investing activities	250,557	40,996
CASH FLOWS FROM FINANCING ACTIVITIES:
Net decrease in deposit liabilities	(307,500)	(121,444)
Net increase in securities sold under agreements to repurchase	5,735	2,040
Repayment of junior subordinated debentures	(8,764)	0
Dividends paid on common stock	0	(7,890)
Excess tax benefits from stock based compensation	27	46
Proceeds from stock options exercised	34	21
Retirement of common stock	(428)	(5,013)
Net cash used by financing activities	(310,896)	(132,240)
Net increase (decrease) in cash and cash equivalents	174,401	(60,445)
Cash and cash equivalents, beginning of period	543,787	598,766
Cash and cash equivalents, end of period	718,188	538,321
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Interest	11,181	14,392
Income taxes	1,100	0
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Change in unrealized gains on investment securities available for sale, net of taxes	(2,659)	1,124
Change in unrealized losses on investment securities held to maturity related to factors other than credit, net of taxes	17	41
Cash dividend declared on common stock and payable after period-end	11,288	7,887
Transfer of non-covered loans to non-covered other real estate owned	5,689	7,209
Transfer of covered loans to covered other real estate owned	1,741	784
Transfer of covered loans to non-covered loans	7,899	4,563
Transfer from FDIC indemnification asset to due from FDIC and other	$ 1,679	$ 10,827