Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 140,934	$ 132,345
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Provision for loan losses	8,000	0	3,000
Depreciation and amortization	36,738	31,737
(Recovery of) addition to valuation allowance on mortgage servicing rights, net	(14,097)	4,477
Amortization of mortgage servicing rights	12,479	17,326
Amortization of other intangible assets	3,032	3,146
Amortization and accretion on earning assets, funding, and other, net	36,973	45,400
Tax impact of stock-based compensation	448	5
(Gain) loss on sales of investment securities, net and impairment write-downs	(582)	(4,109)
(Gain) loss on sales of assets and impairment write-downs, net	(2,726)	11,887
Gain on mortgage banking activities, net	(31,539)	(46,655)
Mortgage loans originated and acquired for sale	(1,977,357)	(2,016,963)
Proceeds from sales of mortgage loans held for sale	2,152,286	2,137,051
Pension Contributions	(28,000)	(32,000)
(Increase) decrease in interest receivable	739	3,336
Increase (decrease) in interest payable	(8,293)	(11,446)
Net change in other assets and other liabilities	42,521	42,441
Net cash provided by (used in) operating activities	371,556	317,978
CASH FLOWS FROM INVESTING ACTIVITIES
Net (increase) decrease in loans	(233,755)	(1,151,440)
Purchases of:
Investment securities	(1,390,729)	(1,175,405)
Premises, equipment, and software, net of disposals	(49,139)	(58,865)
FHLB stock	(28,399)	0
Other assets	(1,401)	(3,846)
Proceeds from:
Sales of investment securities	135,809	286,336
Sale of FHLB stock	14,399	25,381
Prepayments, calls and maturities of investment securities	1,082,290	1,271,031
Sales, prepayments, calls, and maturities of other assets	30,857	28,366
Sales of loans originated for investment	0	124,903
Net cash provided by (used in) investing activities	(440,068)	(653,539)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase (decrease) in deposits	1,398,043	1,479,782
Net decrease in deposits due to branch sales	0	(113,622)
Net increase (decrease) in short-term funding	(700,059)	(761,200)
Repayment of long-term funding	(400,156)	(25,979)
Proceeds from issuance of long-term funding	0	154,738
Proceeds from issuance of preferred stock		0
Redemption of preferred stock	(617)	0
Cash dividends on common stock	(40,223)	(26,009)
Cash dividends on preferred stock	(3,885)	(3,900)
Purchase of treasury stock	(93,294)	(31,552)
Net cash provided by (used in) financing activities	159,809	672,258
Net increase (decrease) in cash and cash equivalents	91,297	336,697
Cash and cash equivalents at beginning of period	737,873	616,595	616,595
Cash and cash equivalents at end of period	829,170	953,292	737,873
Supplemental disclosures of cash flow information:
Cash paid for interest	57,310	84,699
Cash (received) paid for income taxes	29,700	(32,050)
Loans and bank premises transferred to other real estate owned	21,962	29,957
Capitalized mortgage servicing rights	$ 15,968	$ 18,669