Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
OPERATING ACTIVITIES
Net income	$ 75,279	$ 140,473
Adjustments to reconcile net income to cash provided by operating activities:
Provision for loan and lease losses	(7,665)	(39,531)
Deferred tax expense (benefit)	(23,030)	(18,000)
Change in current taxes payable	(24,716)	(37,737)
Depreciation	53,249	52,212
Change in accrued interest payable	(1,434)	(3,302)
Change in income earned not collected	(121)	1,556
Gain on sale of other assets	0	(4,085)
Origination of loans held for sale	(198,134)	(323,665)
Proceeds from sale of loans held for sale	206,310	376,395
Gain on sale of loans	(3,334)	(9,451)
Loss on sale of other real estate	9,770	4,574
Net amortization of premiums and discounts	(35,342)	(96,091)
FDIC receivable for loss share agreements	16,708	58,802
FDIC payable for loss share agreements	7,546	5,862
Net change in other assets	(34,872)	107,757
Net change in other liabilities	27,327	47,692
Net cash provided by operating activities	67,541	263,461
INVESTING ACTIVITIES
Net change in loans outstanding	(329,925)	364,916
Purchases of investment securities available for sale	(1,999,666)	(1,940,198)
Proceeds from maturities of investment securities held to maturity	300	329
Proceeds from maturities of investment securities available for sale	1,993,051	1,951,735
Net change in overnight investments	151,972	(910,951)
Cash received from the FDIC for loss share agreements	(5,479)	45,103
Proceeds from sale of other real estate	55,478	120,712
Additions to premises and equipment	(65,763)	(38,887)
Business acquisition, net of cash acquired	18,194	0
Net cash (used) provided by investing activities	(181,838)	(407,241)
FINANCING ACTIVITIES
Net change in time deposits	(301,849)	(529,675)
Net change in demand and other interest-bearing deposits	202,853	506,969
Net change in short-term borrowings	91,345	35,930
Repayment of long-term obligations	(2,001)	(3,958)
Origination of long-term obligations	0	70,000
Repurchase of common stock	0	(321)
Cash dividends paid	(8,657)	(5,777)
Net cash provided (used) by financing activities	(18,309)	73,168
Change in cash and due from banks	(132,606)	(70,612)
Cash and due from banks at beginning of period	533,599	639,730
Cash and due from banks at end of period	400,993	569,118
CASH PAYMENTS FOR:
Interest	36,909	46,873
Income taxes	112,836	99,398
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Transfers of loans to other real estate	42,136	78,303
Dividends declared but not paid	2,886	2,886
Reclassification of Long-Term Obligations to Short-Term Borrowings	$ 195,000	$ 0