Consolidated Statements of Condition (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Assets
Cash and due from banks	$ 238,924	$ 283,100
Investment securities:
Held-to-maturity (Market value of $2,400 on June 30, 2013 and $2,400 on December 31, 2012)	2,400	2,400
Available-for-sale (Amortized cost of $5,213,646 on June 30, 2013 and $5,423,189 on December 31, 2012)	5,189,977	5,525,015
Total investment securities	5,192,377	5,527,415
Loans	4,911,949	4,775,004
Less allowance for probable loan losses	(65,051)	(58,193)
Net loans	4,846,898	4,716,811
Bank premises and equipment, net	484,345	481,287
Accrued interest receivable	30,711	31,034
Other investments	366,476	372,739
Identified intangible assets, net	5,524	7,819
Goodwill	282,532	282,532
Other assets	149,126	179,936
Total assets	11,596,913	11,882,673
Deposits:
Demand - non-interest bearing	2,613,721	2,465,750
Savings and interest bearing demand	2,833,768	2,867,151
Time	2,746,235	2,954,312
Total deposits	8,193,724	8,287,213
Securities sold under repurchase agreements	1,025,071	1,129,679
Other borrowed funds	752,458	749,027
Junior subordinated deferrable interest debentures	190,726	190,726
Other liabilities	37,640	90,320
Total liabilities	10,199,619	10,446,965
Commitments and Contingent Liabilities (Note 10)
Shareholders' equity:
Common shares of $1.00 par value. Authorized 275,000,000 shares; issued 95,730,472 shares on June 30, 2013 and 95,724,517 shares on December 31, 2012	95,730	95,725
Surplus	163,567	163,287
Retained earnings	1,411,687	1,369,543
Accumulated other comprehensive (loss) income (including $(6,352) and $(6,811) of comprehensive loss related to other-than-temporary impairment for non-credit related issues)	(15,181)	65,662
Total shareholders' equity before treasury stock	1,655,803	1,694,217
Less cost of shares in treasury, 28,537,180 shares on June 30, 2013 and 28,537,180 December 31, 2012	(258,509)	(258,509)
Total shareholders' equity	1,397,294	1,435,708
Total liabilities and shareholders' equity	$ 11,596,913	$ 11,882,673