Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 119,757	$ 119,605
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	38,000	76,500
Depreciation and amortization of premises and equipment	19,165	16,735
Net amortization of investment securities premiums	8,749	8,039
Investment securities gains, net	(7,971)	(2,831)
Net (increase) decrease in loans held for sale	28,626	(38,468)
Amortization of intangible assets	1,603	2,318
Stock-based compensation	4,186	3,963
Excess tax benefit from share-based compensation	(237)	(25)
Decrease in accrued interest receivable	1,071	1,314
Decrease in other assets	38,485	12,956
Decrease in accrued interest payable	(2,673)	(3,868)
Decrease in other liabilities	(24,207)	(2,191)
Total adjustments	104,797	74,442
Net cash provided by operating activities	224,554	194,047
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sales of securities available for sale	283,242	225,539
Proceeds from maturities of securities held to maturity	86	228
Proceeds from maturities of securities available for sale	526,393	644,055
Purchase of securities held to maturity	0	(346)
Purchase of securities available for sale	(723,859)	(796,656)
Decrease in short-term investments	(47,807)	(26,969)
Net increase in loans	(684,529)	(63,446)
Net purchases of premises and equipment	(18,741)	(30,232)
Net cash used in investing activities	(665,215)	(47,827)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in demand and savings deposits	595,722	510,296
Net decrease in time deposits	(358,764)	(434,952)
Decrease in short-term borrowings	330,178	(110,062)
Repayments of long-term debt	(5,131)	(131,526)
Net proceeds from issuance of stock	7,122	5,085
Excess tax benefit from share-based compensation	237	25
Dividends paid	(31,138)	(40,117)
Acquisition of treasury stock	(90,927)	(20,360)
Net cash used in financing activities	447,299	(221,611)
Net (Decrease) Increase in Cash and Due From Banks	6,638	(75,391)
Cash and Due From Banks at Beginning of Period	256,300	292,598
Cash and Due From Banks at End of Period	262,938	217,207
Cash paid during the period for:
Interest	65,663	83,698
Income taxes	$ 29,964	$ 22,671