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Securities (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2012 security | Dec. 31, 2011
Schedule of Securities [Line Items] |  |
Securities pledged to secure public deposits, trust deposits, and for other purposes, carrying value | $ 587,865 | $ 547,727
Securities pledged as collateral for short-term borrowings, carrying value | 747,289 | 680,212
Number of pooled issue securities | 29 |
Recover rate of banks | 10.00% |
Recover rate of insurance companies | 15.00% |
Number of single issue securities | 6 |
Estimated fair value of single-issue trust preferred securities | 7,786 |
Percent of municipal bond portfolio, general obligation bonds | 99.50% |
Estimated fair value of pooled trust preferred securities | 24,192 |
Number of non-performing investments | 9 |
Number of performing investments | 3 |
Municipal bond portfolio, value | 182,881 |
Purchase of non-agency collateralized mortgage obligations from 2003 through 2005 | 161,151 |
Purchase of additional non-agency collateralized mortgage obligations | 42,870 |
Retained non-agency collateralized mortgage obligations | 4,298 |
Sale of non-agency collateralized mortgage obligations | 38,572 |
Book value of non-agency collateralized mortgage obligations | 23,518 |
Percent of municipal bond portfolio rated A or better | 99.80% |
Percent of municipal bonds from Pennsylvania | 76.80% |
Average holding size of municipal bond | 1,010 |
Percent of portfolio with credit support | 77.40% |
Non-agency collateralized mortgage obligations paydown balance on maturity | 2,704 |
Annualized payout rate | 37.70% |
Original credit score | 724 |
Ratio of original average loan-to-value | 66.10% |
Credit-related loss recognized | 226 |
Accreted income | 133 |
U.S. Treasury And Other U.S. Government Agencies And Corporations [Member] |  |
Schedule of Securities [Line Items] |  |
Securities with unrealized losses for less than 12 months | 10 |
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Securities [Line Items] |  |
Securities with unrealized losses for less than 12 months | 15 |
Securities with unrealized losses of greater than 12 months | 1 |
Agency Mortgage-Backed Securities [Member] |  |
Schedule of Securities [Line Items] |  |
Securities with unrealized losses for less than 12 months | 10 |
Agency Collateralized Mortgage Obligations [Member] |  |
Schedule of Securities [Line Items] |  |
Securities with unrealized losses for less than 12 months | 1 |
Non-Agency Collateralized Mortgage Obligations [Member] |  |
Schedule of Securities [Line Items] |  |
Securities with unrealized losses for less than 12 months | 4 |
Book value of non-agency collateralized mortgage obligations sold | $ 2,848 |
Senior Tranche [Member] |  |
Schedule of Securities [Line Items] |  |
Number of single issue securities | 2 |
States Of The U.S. And Political Subdivisions [Member] |  |
Schedule of Securities [Line Items] |  |
Securities with unrealized losses for less than 12 months | 3 |
Collateralized Debt Obligations [Member] |  |
Schedule of Securities [Line Items] |  |
Securities with unrealized losses for less than 12 months | 8 |
Securities with unrealized losses of greater than 12 months | 13 |
Other Debt Securities [Member] |  |
Schedule of Securities [Line Items] |  |
Securities with unrealized losses of greater than 12 months | 5 |
Equity Securities [Member] |  |
Schedule of Securities [Line Items] |  |
Securities with unrealized losses for less than 12 months | 2 |
Mezzanine Tranches [Member] |  |
Schedule of Securities [Line Items] |  |
Number of pooled issue securities | 27 |
Maximum [Member] |  |
Schedule of Securities [Line Items] |  |
Deferral rates after the deferral period ends maximum | 90.00% |
Range of credit loss | 7.00% |
Range of grown percentage of credit support due to paydowns and good credit performance | 20.50% |
Minimum [Member] |  |
Schedule of Securities [Line Items] |  |
Deferral rates after the deferral period ends | 10.00% |
Range of credit loss | 2.00% |
Range of grown percentage of credit support due to paydowns and good credit performance | 4.00% |

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