| **Short-Term Borrowings and Long-Term Debt (Retail Repurchase Agreements and Federal Funds Purchased) (Details) (USD $)** | 12 Months Ended                                                                                                                                           |
|---------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------|
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| **Short-term Debt [Line Items]**                                                                                          |                                                                                                                                                      |   |   |
| Short-term borrowings                                                                                                     | $ 9,076,000us-gaap_ShortTermBorrowings                                                                                                                    | $ 6,917,000us-gaap_ShortTermBorrowings |   |
| Retail customer repurchase agreements                                                                                     | 9,076,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchase                                                                                                | 6,917,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchase | 8,675,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchase |
| Federal Reserve Bank Lines of Credit [Member]                                                                             |                                                                                                                                                      |   |   |
| **Short-term Debt [Line Items]**                                                                                          |                                                                                                                                                      |   |   |
| Short-term borrowings                                                                                                     |                                                                                                                                                      | 0us-gaap_ShortTermBorrowings/ us-gaap_ShortTermDebtTypeAxis= us-gaap_FederalReserveBankAdvancesMember |   |
| Retail repurchase agreements [Member]                                                                                     |                                                                                                                                                      |   |   |
| **Short-term Debt [Line Items]**                                                                                          |                                                                                                                                                      |   |   |
| Average balance during the year                                                                                           | 7,713,000us-gaap_ShorttermDebtAverageOutstandingAmount/ us-gaap_ShortTermDebtTypeAxis= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember            | 9,852,000us-gaap_ShorttermDebtAverageOutstandingAmount/ us-gaap_ShortTermDebtTypeAxis= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember | 9,861,000us-gaap_ShorttermDebtAverageOutstandingAmount/ us-gaap_ShortTermDebtTypeAxis= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember |
| Maximum month end balance                                                                                                 | $ 12,217,000us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount/ us-gaap_ShortTermDebtTypeAxis= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember | $ 13,064,000us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount/ us-gaap_ShortTermDebtTypeAxis= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember | $ 12,720,000us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount/ us-gaap_ShortTermDebtTypeAxis= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember |
| Weighted average interest rate at December 31                                                                             | 0.21%us-gaap_ShortTermDebtWeightedAverageInterestRate/ us-gaap_ShortTermDebtTypeAxis= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember             | 0.21%us-gaap_ShortTermDebtWeightedAverageInterestRate/ us-gaap_ShortTermDebtTypeAxis= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember | 0.19%us-gaap_ShortTermDebtWeightedAverageInterestRate/ us-gaap_ShortTermDebtTypeAxis= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember |
| Weighted average interest rate during the year                                                                            | 0.21%us-gaap_DebtInstrumentInterestRateDuringPeriod/ us-gaap_ShortTermDebtTypeAxis= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember               | 0.21%us-gaap_DebtInstrumentInterestRateDuringPeriod/ us-gaap_ShortTermDebtTypeAxis= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember | 0.29%us-gaap_DebtInstrumentInterestRateDuringPeriod/ us-gaap_ShortTermDebtTypeAxis= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The average effective interest rate during the reporting period.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                              |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period.
+ References
No definition available.
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| X                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, maximum month-end borrowings during the period.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Industry Guide -Number 3 -Section VII -Subsection 2
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Weighted average interest rate of short-term debt outstanding.
+ References
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| X                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                             |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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