Segment Information (Schedule Of Operating Results By Segment) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Net interest income	$ 70,022	$ 68,721	$ 139,335	$ 136,101
Provision for loan losses	23,900	13,250	37,400	29,800
Other income (loss) and security gains	28,598	20,162	48,404	45,176
Other expense	47,007	47,001	93,353	94,891
Net income	20,317	21,166	41,695	41,945
Assets	7,328,686	7,093,098	7,328,686	7,093,098	7,298,377
PNB [Member]
Net interest income	60,542	59,612	120,779	118,011
Provision for loan losses	4,975	3,800	9,950	8,550
Other income (loss) and security gains	30,403	20,840	53,300	45,618
Other expense	36,315	35,752	72,636	72,554
Net income	34,250	27,850	63,279	56,185
Assets	6,565,419	6,215,606	6,565,419	6,215,606
VB [Member]
Net interest income	7,000	6,914	13,755	13,805
Provision for loan losses	18,400	8,900	26,400	20,200
Other income (loss) and security gains	(246)	(756)	(3,422)	(605)
Other expense	8,174	8,237	15,599	16,091
Net income	(12,855)	(6,756)	(20,519)	(14,212)
Assets	750,642	863,315	750,642	863,315
All Other [Member]
Net interest income	2,480	2,195	4,801	4,285
Provision for loan losses	525	550	1,050	1,050
Other income (loss) and security gains	(1,559)	78	(1,474)	163
Other expense	2,518	3,012	5,118	6,246
Net income	(1,078)	72	(1,065)	(28)
Assets	$ 12,625	$ 14,177	$ 12,625	$ 14,177