Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Operating Activities:
Net income	$ 23,018	$ 31,211
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Amortization of premiums on investments	4,710	4,308
Depreciation and amortization of tangible and intangible assets	18,091	9,643
Amortization of loss on settlement of interest rate swaps	3,674	3,797
Amortization and impairment of mortgage servicing rights	108,760	44,217
Deferred income taxes	(8,347)	39,272
Provision for loan and lease losses	17,112	27,034
Loss on other real estate owned	4,605	8,664
Share-based compensation expense	2,229	4,281
Payments for settlement of forward interest rate swaps	(14,002)	(2,796)
Other operating activities	(2,778)	2,665
Changes in operating assets and liabilities, net of acquired assets and liabilities:
Loans held for sale, including proceeds from sales and repayments	(788,325)	401,193
Other assets	37,043	3,800
Accounts payable and accrued liabilities	1,638	6,093
Net cash provided by (used in) operating activities	(592,572)	583,382
Investment securities available for sale:
Purchases	(210,717)	(972,910)
Proceeds from sales	0	60,961
Proceeds from prepayments and maturities	274,042	302,866
Investment securities held to maturity:
Purchases	(14,917)	(153,885)
Proceeds from prepayments and maturities	13,506	4,531
Purchases of other investments	(37,422)	(2,552)
Proceeds from sale of other investments	0	43,060
Increase in loans and leases held for investment, net of discount accretion, premium amortization and principal repayments	(880,630)	(940,821)
Cash paid for acquisition	(351,071)	0
Purchases of premises and equipment, including equipment under operating leases	(31,267)	(26,225)
Proceeds related to sale or settlement of real estate owned	18,664	24,540
Proceeds from insured foreclosure claims	61,869	116,348
Other investing activities	(190)	(653)
Net cash used in investing activities	(1,158,133)	(1,544,740)
Financing Activities:
Net increase in nonmaturity deposits	343,692	153,393
Net increase in time deposits	182,987	100,007
Increase in short-term Federal Home Loan Bank (FHLB) advances	370,000	310,000
Proceeds from long-term FHLB advances	1,100,000	6,158
Repayments of long-term FHLB advances	(223,500)	(85,008)
Proceeds from issuance of common stock	207,514	1,093
Other financing activities	6,737	9,916
Net cash provided by financing activities	1,973,956	475,727
Net change in cash and cash equivalents	223,251	(485,631)
Cash and cash equivalents at beginning of period	294,981	1,169,221
Cash and cash equivalents at end of period	518,232	683,590
Supplemental Schedules of Noncash Investing and Financing Activities:
Loans transferred to foreclosure claims from loans held for investment	67,487	120,526
Loans transferred to foreclosure claims from loans held for sale	142,519	10,264
Loans transferred to other real estate owned from loans held for investment	26,472	40,186
Additions of originated mortgage servicing assets for loans sold	37,027	26,657
Preferred Stock [Member]
Supplemental Schedules of Noncash Investing and Financing Activities:
Conversion of preferred stock	$ 135,585	$ 0