Segment Information (Schedule Of Operating Results By Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Segment Reporting Information [Line Items]
Net interest income	$ 67,620	$ 69,445	$ 206,955	$ 205,546
Provision for loan losses	16,438	14,654	43,054	44,454
Other income (loss) and security gains	21,492	17,530	73,657	62,706
Other expense	45,599	45,696	138,952	140,587
Net income (loss)	20,381	19,577	71,530	61,522
Assets	7,095,098	7,090,456	7,095,098	7,090,456	7,282,261
PNB [Member]
Segment Reporting Information [Line Items]
Net interest income	58,588	59,986	179,366	177,997
Provision for loan losses	9,000	6,576	18,950	15,126
Other income (loss) and security gains	20,290	17,588	73,590	63,206
Other expense	35,936	35,406	108,572	107,960
Net income (loss)	24,518	24,425	87,798	80,610
Assets	6,346,125	6,269,783	6,346,125	6,269,783
VB [Member]
Segment Reporting Information [Line Items]
Net interest income	6,493	7,174	20,248	20,979
Provision for loan losses	6,913	7,529	22,529	27,729
Other income (loss) and security gains	2,014	(139)	2,352	(744)
Other expense	7,267	7,726	22,866	23,817
Net income (loss)	(3,665)	(5,316)	(14,730)	(19,528)
Assets	714,674	838,090	714,674	838,090
All Other [Member]
Segment Reporting Information [Line Items]
Net interest income	2,539	2,285	7,341	6,570
Provision for loan losses	525	549	1,575	1,599
Other income (loss) and security gains	(812)	81	(2,285)	244
Other expense	2,396	2,564	7,514	8,810
Net income (loss)	(472)	468	(1,538)	440
Assets	$ 34,299	$ (17,417)	$ 34,299	$ (17,417)