Consolidated Statements of Condition (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Assets
Cash and cash equivalents	$ 351,287	$ 274,785
Investment securities:
Held-to-maturity (Market value of $2,400 on March 31, 2014 and $2,400 on December 31, 2013)	2,400	2,400
Available-for-sale (Amortized cost of $5,259,440 on March 31, 2014 and $5,372,594 on December 31, 2013)	5,222,557	5,304,579
Total investment securities	5,224,957	5,306,979
Loans	5,286,500	5,199,235
Less allowance for probable loan losses	(70,408)	(70,161)
Net loans	5,216,092	5,129,074
Bank premises and equipment, net	510,583	504,842
Accrued interest receivable	28,309	30,654
Other investments	382,072	388,563
Identified intangible assets, net	2,205	3,186
Goodwill	282,532	282,532
Other assets	146,148	158,862
Total assets	12,144,185	12,079,477
Deposits:
Demand - non-interest bearing	2,829,995	2,666,510
Savings and interest bearing demand	2,966,062	2,925,612
Time	2,640,186	2,651,303
Total deposits	8,436,243	8,243,425
Securities sold under repurchase agreements	837,170	957,381
Other borrowed funds	1,148,403	1,223,950
Junior subordinated deferrable interest debentures	180,416	190,726
Other liabilities	76,037	39,587
Total liabilities	10,678,269	10,655,069
Shareholders' equity:
Common shares of $1.00 par value. Authorized 275,000,000 shares; issued 95,751,991 shares on March 31, 2014 and 95,743,592 shares on December 31, 2013	95,752	95,744
Surplus	164,220	163,947
Retained earnings	1,493,904	1,467,000
Accumulated other comprehensive loss (including $(5,567) and $(5,646) of comprehensive loss related to other-than-temporary impairment for non-credit related issues)	(23,696)	(43,774)
Total shareholders' equity before treasury stock	1,730,180	1,682,917
Less cost of shares in treasury, 28,787,389 shares on March 31, 2014 and 28,537,180 December 31, 2013	(264,264)	(258,509)
Total shareholders' equity	1,465,916	1,424,408
Total liabilities and shareholders' equity	$ 12,144,185	$ 12,079,477