Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net income for the period	$ 90,437	$ 92,025
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	36,333	(283)
Depreciation and amortization	40,736	34,169
Fixed income securities losses (gains), net	(28)	239
Deferred income tax expense (benefit)	(4,680)	3,402
Net increase in trading securities	(17,670)	(1,021)
Net decrease in loans held for sale	38,566	3,517
Change in other liabilities	17,770	25,566
Change in other assets	7,301	(65,248)
Other, net	13,997	(3,549)
Net cash provided by operating activities	222,762	88,817
CASH FLOWS FROM INVESTING ACTIVITIES
Net decrease in money market investments	2,101,580	253,274
Proceeds from maturities and paydowns of investment securities held-to-maturity	22,036	39,323
Purchases of investment securities held-to-maturity	(108,141)	(22,576)
Proceeds from sales, maturities, and paydowns of investment securities available-for-sale	2,098,526	228,894
Purchases of investment securities available-for-sale	(3,123,244)	(784,856)
Net change in loans and leases	(808,358)	(100,442)
Purchases of premises and equipment	(40,015)	(33,533)
Proceeds from sales of other real estate owned	4,304	3,401
Other, net	(10,565)	3,351
Net cash provided by (used in) investing activities	136,123	(413,164)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase (decrease) in deposits	(486,234)	275,285
Net change in short-term funds borrowed	(114,799)	(40,626)
Repayments of long-term debt	(10,636)	(8,185)
Proceeds from issuances of common stock	538	962
Dividends paid on common and preferred stock	(27,421)	(23,234)
Other, net	(849)	(939)
Net cash provided by (used in) financing activities	(639,401)	203,263
Net decrease in cash and due from banks	(280,516)	(121,084)
Cash and due from banks at beginning of period	798,319	841,942
Cash and due from banks at end of period	517,803	720,858
Cash paid for interest	18,430	22,119
Net refunds received for income taxes	$ (84)	$ (500)