CONSOLIDATED STATEMENT OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities
Net income	$ 274,113	$ 206,463
Adjustments to reconcile net income to net cash provided by operating activities
Provision for credit losses	38,000	49,000
Depreciation and amortization of premises and equipment	22,027	21,022
Amortization of capitalized servicing rights	15,208	14,476
Amortization of core deposit and other intangible assets	13,343	16,774
Provision for deferred income taxes	19,253	15,225
Asset write-downs	13,558	16,388
Net gain on sales of assets	(2,676)	(2,471)
Net change in accrued interest receivable, payable	(2,872)	7,725
Net change in other accrued income and expense	80,645	32,134
Net change in loans originated for sale	205,643	154,436
Net change in trading account assets and liabilities	22,156	7,840
Net cash provided by operating activities	698,398	539,012
Cash flows from investing activities
Proceeds from sales of investment securities Available for sale		1,045
Proceeds from sales of investment securities Other	2,032	10,224
Proceeds from maturities of investment securities Available for sale	353,305	417,348
Proceeds from maturities of investment securities Held to maturity	79,164	82,670
Purchases of investment securities Available for sale	(14,597)	(10,286)
Purchases of investment securities Held to maturity	(6,010)	(6,287)
Purchases of investment securities Other	(274)	(318)
Net (increase) decrease in loans and leases	404,142	(1,042,144)
Net increase in interest-bearing deposits at banks	(1,174,825)	(1,127,080)
Other investments, net	698	2,416
Capital expenditures, net	(16,671)	(19,377)
Proceeds from sales of real estate acquired in settlement of loans	15,500	33,775
Other, net	(14,237)	(25,840)
Net cash used by investing activities	(371,773)	(1,683,854)
Cash flows from financing activities
Net increase (decrease) in deposits	(519,555)	1,522,583
Net decrease in short-term borrowings	(699,889)	(270,081)
Proceeds from long-term borrowings	799,760
Payments on long-term borrowings	(3,460)	(202,352)
Dividends paid-common	(90,788)	(89,041)
Dividends paid-preferred	(4,769)	(4,769)
Other, net	31,528	80,197
Net cash provided (used) by financing activities	(487,173)	1,036,537
Net decrease in cash and cash equivalents	(160,548)	(108,305)
Cash and cash equivalents at beginning of period	1,986,615	1,452,397
Cash and cash equivalents at end of period	1,826,067	1,344,092
Supplemental disclosure of cash flow information
Interest received during the period	718,296	721,159
Interest paid during the period	72,106	89,241
Income taxes paid during the period	9,545	8,416
Supplemental schedule of noncash investing and financing activities
Real estate acquired in settlement of loans	$ 8,244	$ 17,123