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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) |

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