Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities
Net income	$ 634,559	$ 528,301
Adjustments to reconcile net income to net cash provided by operating activities
Provision for credit losses	81,000	68,000
Depreciation and amortization of premises and equipment	53,514	48,199
Amortization of capitalized servicing rights	24,648	24,572
Amortization of core deposit and other intangible assets	23,737	12,758
Provision for deferred income taxes	94,458	29,884
Asset write-downs	7,737	4,076
Net gain on sales of assets	(10,477)	(48,637)
Net change in accrued interest receivable, payable	2,358	7,912
Net change in other accrued income and expense	(32,180)	(39,503)
Net change in loans originated for sale	(188,771)	(77,677)
Net change in trading account assets and liabilities	(40,552)	198
Net cash provided by operating activities	650,031	558,083
Cash flows from investing activities
Proceeds from sales of investment securities Available for sale	4,970	2,539
Proceeds from sales of investment securities Other	85,389	254
Proceeds from maturities of investment securities Available for sale	1,067,100	859,904
Proceeds from maturities of investment securities Held to maturity	291,917	351,110
Purchases of investment securities Available for sale	(518,203)	(3,013,384)
Purchases of investment securities Held to maturity	(10,456)	(17,403)
Purchases of investment securities Other	(1,019)	(7,686)
Net increase in loans and leases	(930,426)	(1,465,261)
Net (increase) decrease in interest-bearing deposits at banks	(880,489)	2,425,015
Capital expenditures, net	(36,619)	(23,395)
Net decrease in loan servicing advances	119,190	317,276
Other, net	(98,452)	16,450
Net cash used by investing activities	(907,098)	(554,581)
Cash flows from financing activities
Net increase (decrease) in deposits	2,705,332	(951,347)
Net decrease in short-term borrowings	(1,693,603)	(39,377)
Proceeds from long-term borrowings		1,500,000
Payments on long-term borrowings	(322,591)	(323,025)
Purchases of treasury stock	(254,000)
Dividends paid - common	(223,179)	(187,278)
Dividends paid - preferred	(40,635)	(40,635)
Other, net	2,145	15,661
Net cash provided (used) by financing activities	173,469	(26,001)
Net decrease in cash and cash equivalents	(83,598)	(22,499)
Cash and cash equivalents at beginning of period	1,368,040	1,373,357
Cash and cash equivalents at end of period	1,284,442	1,350,858
Supplemental disclosure of cash flow information
Interest received during the period	1,947,027	1,478,848
Interest paid during the period	257,222	149,255
Income taxes paid during the period	105,361	225,107
Supplemental schedule of noncash investing and financing activities
Real estate acquired in settlement of loans	66,286	23,273
Securitization of residential mortgage loans allocated to Available-for-sale investment securities	13,923	36,645
Securitization of residential mortgage loans allocated to capitalized servicing rights	$ 143	$ 368