Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 178,973	$ 139,699	$ (856)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Provision for loan losses	3,000	52,000	390,010
Depreciation and amortization	43,611	33,628	30,108
Addition to valuation allowance on mortgage servicing rights, net	2,383	7,403	3,067
Amortization of mortgage servicing rights	23,348	25,830	22,942
Amortization of other intangible assets	4,195	4,714	4,919
Amortization and accretion on earning assets, funding, and other, net	55,101	65,670	62,714
Deferred income taxes	54,294	34,742	50,808
Tax impact of stock-based compensation	(785)	(2,345)	11
(Gain) loss on sales of investment securities, net, and impairment write-downs	(4,261)	1,112	(24,917)
Loss on sales of assets and impairment write-downs, net	12,096	12,199	12,065
Gain on mortgage banking activities, net	(60,312)	(31,628)	(34,967)
Mortgage loans originated and acquired for sale	(2,797,431)	(1,855,037)	(2,314,557)
Proceeds from sales of mortgage loans held for sale	2,822,000	1,764,801	2,259,789
Decrease in interest receivable	534	5,062	13,466
Decrease in interest payable	(5,723)	(1,232)	(4,051)
Net change in other assets and other liabilities	19,461	53,169	38,871
Net cash provided by operating activities	350,484	309,787	509,422
CASH FLOWS FROM INVESTING ACTIVITIES
Net (increase) decrease in loans	(1,637,901)	(1,754,499)	616,608
Purchases of:
Investment securities	(2,131,026)	(777,309)	(3,369,225)
Premises, equipment, and software, net of disposals	(83,973)	(76,648)	(34,595)
Other assets	(5,968)	(3,061)	(15,516)
Proceeds from:
Sales of investment securities	299,782	176,267	971,662
Calls and maturities of investment securities	1,723,504	1,776,245	2,027,847
Sales, prepayments, calls, and maturities of other assets	70,920	50,417	67,400
Sales of loans originated for investment	130,940	136,051	352,589
Net cash provided by (used in) investing activities	(1,633,722)	(472,537)	616,770
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase (decrease) in deposits	1,969,055	(134,738)	(1,503,220)
Net decrease in deposits due to branch sales	(113,622)	0	0
Net increase (decrease) in short-term funding	(187,546)	767,103	520,529
Repayment of long-term funding	(311,621)	(670,104)	(940,361)
Proceeds from issuance of long-term funding	154,738	432,504	400,000
Proceeds from issuance of common stock	0	0	478,358
Proceeds from issuance of preferred stock	0	63,272	0
Redemption of preferred stock	0	(525,000)	0
Cash dividends on common stock	(39,634)	(6,977)	(6,948)
Cash dividends on preferred stock	(5,200)	(14,218)	(26,250)
Purchase of treasury stock	(61,654)	(659)	(830)
Net cash provided by (used in) financing activities	1,404,516	(88,817)	(1,078,722)
Net increase (decrease) in cash and cash equivalents	121,278	(251,567)	47,470
Cash and cash equivalents at beginning of period	616,595	868,162	820,692
Cash and cash equivalents at end of period	737,873	616,595	868,162
Supplemental disclosures of cash flow information:
Cash paid for interest	97,938	129,720	175,776
Cash received for income taxes	(9,722)	(10,839)	(93,723)
Loans and bank premises transferred to other real estate owned	39,511	48,752	49,427
Capitalized mortgage servicing rights	$ 23,528	$ 17,476	$ 26,165