Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 39,227	$ 38,132
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	15,000	28,000
Depreciation and amortization of premises and equipment	5,508	5,327
Net amortization of investment securities premiums	3,846	2,849
Investment securities gains, net	(2,473)	(1,251)
Net (increase) decrease in loans held for sale	4,854	(23,119)
Amortization of intangible assets	534	801
Stock-based compensation	847	713
Excess tax benefit from share-based compensation	(88)	(3)
Decrease in accrued interest receivable	(1,699)	(149)
Decrease in other assets	7,194	(48)
Decrease in accrued interest payable	2,063	1,988
Decrease in other liabilities	3,008	7,714
Total adjustments	38,594	22,822
Net cash provided by operating activities	77,821	60,954
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sales of securities available for sale	59,043	183,685
Proceeds from maturities of securities held to maturity	35	75
Proceeds from maturities of securities available for sale	199,910	177,855
Purchase of securities held to maturity	0	(14)
Purchase of securities available for sale	(339,707)	(539,783)
Decrease in short-term investments	76,055	69,109
Net increase in loans	(249,229)	(16,821)
Net purchases of premises and equipment	(4,539)	(8,809)
Net cash used in investing activities	(258,432)	(134,703)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in demand and savings deposits	19,339	(45,297)
Net decrease in time deposits	(115,042)	(137,381)
Decrease in short-term borrowings	258,567	367,517
Repayments of long-term debt	(5,042)	(106,168)
Net proceeds from issuance of stock	2,647	1,362
Excess tax benefit from share-based compensation	88	3
Dividends paid	(14,721)	(12,010)
Acquisition of treasury stock	(47,046)	0
Net cash used in financing activities	98,790	68,026
Net (Decrease) Increase in Cash and Due From Banks	(81,821)	(5,723)
Cash and Due From Banks at Beginning of Period	256,300	292,598
Cash and Due From Banks at End of Period	174,479	286,875
Cash paid during the period for:
Interest	19,615	26,208
Income taxes	$ 5,086	$ 4,169