Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
OPERATING ACTIVITIES
Net income	$ 22,366	$ 55,585
Adjustments to reconcile net income to cash provided by operating activities:
Provision for loan and lease losses	(1,903)	(18,606)
Deferred tax expense (benefit)	(4,512)	7,733
Change in current taxes payable	40,710	31,625
Depreciation	17,684	17,994
Change in accrued interest payable	(1,062)	(2,700)
Change in income earned not collected	(1,278)	411
Gain on sale of other assets	0	(4,085)
Origination of loans held for sale	(67,862)	(117,981)
Proceeds from sale of loans held for sale	64,009	121,523
Gain on sale of loans	(1,054)	(3,560)
Loss on sale of other real estate	3,441	1,350
Net amortization of premiums and discounts	(5,796)	(47,236)
FDIC receivable for loss share agreements	4,359	5,619
Net change in other assets	(8,206)	(7,038)
Net change in other liabilities	2,186	32,662
Net cash provided by operating activities	63,082	73,296
INVESTING ACTIVITIES
Net change in loans outstanding	(4,788)	269,428
Purchases of investment securities available for sale	(911,409)	(736,923)
Proceeds from maturities of investment securities held to maturity	125	113
Proceeds from maturities of investment securities available for sale	866,803	676,188
Net change in overnight investments	(302,145)	(511,052)
Cash received from the FDIC for loss share agreements	(3,490)	42,519
Proceeds from sale of other real estate	10,602	36,019
Additions to premises and equipment	(17,326)	(8,713)
Business acquisition, net of cash acquired	18,194	0
Net cash (used) provided by investing activities	(343,434)	(232,421)
FINANCING ACTIVITIES
Net change in time deposits	(51,268)	(195,381)
Net change in demand and other interest-bearing deposits	308,876	174,277
Net change in short-term borrowings	35,970	4,597
Repayment of long-term obligations	(469)	(669)
Repurchase of common stock	0	(321)
Cash dividends paid	(2,885)	(2,891)
Net cash provided (used) by financing activities	290,224	(20,388)
Change in cash and due from banks	9,872	(179,513)
Cash and due from banks at beginning of period	533,599	639,730
Cash and due from banks at end of period	543,471	460,217
CASH PAYMENTS FOR:
Interest	13,525	18,422
Income taxes	2,184	3,364
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Transfers of loans to other real estate	4,832	38,008
Dividends declared but not paid	$ 2,885	$ 0