| **Short-Term Borrowings and Long-Term Debt (Borrowings) (Details) (USD $)** | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 |
|-----------------------------------------------------------------------------|---------------|---------------|---------------|
| **Short-term borrowings:**                                                  |          |          |          |
| Retail customer repurchase agreements                                       | $ 8,675,000   | $ 8,838,000   | $ 9,628,000   |
| Total short-term borrowings                                                 | 8,675,000     | 8,838,000     |          |
| **Long-term debt:**                                                         |          |          |          |
| Federal Home Loan Bank advances                                             | 58,328,000    | 58,370,000    |          |
| Junior subordinated debt                                                    | 56,702,000    | 56,702,000    |          |
| Total long-term debt                                                        | $ 115,030,000 | $ 115,072,000 |          |
| FHLB advance [Member]                                                       |          |          |          |
| **Long-term debt:**                                                         |          |          |          |
| Long-term debt, weighted average interest rate at December 31               | 2.62%         | 2.63%         |          |
| Junior subordinated debt [Member]                                           |          |          |          |
| **Long-term debt:**                                                         |          |          |          |
| Long-term debt, weighted average interest rate at December 31               | 1.83%         | 2.09%         |          |
| Retail customer repurchase agreements [Member]                              |          |          |          |
| **Short-term borrowings:**                                                  |          |          |          |
| Short-term debt, weighted average interest rate at December 31              | 0.19%         | 0.42%         | 0.78%         |

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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer.
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| - Definition
Including the current and noncurrent portions, the carrying value of junior subordinated long-term debt owed to unconsolidated subsidiary trusts as of the balance sheet date. Such debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets and was initially scheduled to be repaid after one year or beyond the normal operating cycle if longer.
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| - Definition
Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.
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Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of long-term debt outstanding by type or by instrument at that time.
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| - Definition
The carrying value as of the balance sheet date of securities that an institution sells and agrees to repurchase (the identical or substantially the same securities) as a seller-borrower at a specified date for a specified price, also known as a repurchase agreement, or repo. Most repos involve obligations of the federal government or its agencies, but other financial instruments, such as commercial paper, banker's acceptances, and negotiable certificates of deposit, are sometimes used in repos.
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| - 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.
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Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of short-term debt outstanding by type or by instrument at that time.
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