Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 188,692	$ 178,973	$ 139,699
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	10,000	3,000	52,000
Depreciation and amortization	49,711	43,611	33,628
(Recovery of) Addition to valuation allowance on mortgage servicing rights, net	(14,563)	2,383	7,403
Amortization of mortgage servicing rights	15,488	23,348	25,830
Amortization of other intangible assets	4,043	4,195	4,714
Amortization and accretion on earning assets, funding, and other, net	44,965	55,101	65,670
Deferred income taxes	25,920	54,294	34,742
Tax impact of stock based compensation	25	(785)	(2,345)
(Gain) loss on sales of investment securities, net of impairment write-downs	(564)	(4,261)	1,112
(Gain) loss on sales of assets and impairment write-downs, net	(5,413)	12,096	12,199
Gain on mortgage banking activities, net	(34,268)	(60,312)	(31,628)
Mortgage loans originated and acquired for sale	(2,304,006)	(2,797,431)	(1,855,037)
Proceeds from sales of mortgage loans held for sale	2,516,690	2,822,000	1,764,801
Pension contributions	(28,000)	(40,000)	(26,000)
Increase (decrease) in interest receivable	2,078	534	5,062
Increase (decrease) in interest payable	(2,214)	(5,723)	(1,232)
Net change in other assets and other liabilities	18,679	59,461	79,169
Net cash provided by operating activities	487,263	350,484	309,787
CASH FLOWS FROM INVESTING ACTIVITIES
Net (increase) decrease in loans	(593,591)	(1,637,901)	(1,754,499)
Purchases of:
Available for sale securities	(1,954,936)	(2,084,500)	(777,309)
Premises, equipment, and software, net of disposals	(67,723)	(83,973)	(76,648)
FHLB Stock	(28,399)	(6,601)	0
Held to maturity securities	(135,785)	(39,925)	0
Other assets	(2,098)	(5,968)	(3,061)
Proceeds from:
Sales of available for sale securities	136,152	299,782	176,267
Prepayments, calls, and maturities of available for sale securities	1,298,077	1,692,076	1,776,245
Sale of FHLB stock	14,399	31,428	0
Prepayments, calls, and maturities of other assets	41,668	70,920	50,417
Sales of loans originated for investment	39,002	130,940	136,051
Net cash provided by (used in) investing activities	(1,253,234)	(1,633,722)	(472,537)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase (decrease) in deposits	394,340	1,969,055	(134,738)
Net increase (decrease) in deposits due to branch sales	(65,430)	(113,622)	0
Net increase (decrease) in short-term funding	(1,586,013)	(187,546)	767,103
Repayment of long-term funding	(427,430)	(311,621)	(670,104)
Proceeds from issuance of long-term funding	2,500,000	154,738	432,504
Proceeds from issuance of preferred shares	0	0	63,272
Purchase of preferred stock	(1,626)	0	(525,000)
Cash dividends on common stock	(54,991)	(39,634)	(6,977)
Cash dividends on preferred stock	(5,158)	(5,200)	(14,218)
Purchase of treasury stock	(123,349)	(61,654)	(659)
Net cash provided by (used in) financing activities	630,343	1,404,516	(88,817)
Net increase (decrease) in cash and cash equivalents	(135,628)	121,278	(251,567)
Cash and cash equivalents at beginning of year	737,873	616,595	868,162
Cash and cash equivalents at end of year	602,245	737,873	616,595
Supplemental disclosures of cash flow information:
Cash paid for interest	65,552	97,938	129,720
Cash paid (received) for income taxes	49,200	(9,722)	(10,839)
Loans and bank premises transferred to other real estate owned	26,151	39,511	48,752
Capitalized mortgage servicing rights	$ 18,256	$ 23,528	$ 17,476