| **Short-Term Borrowings and Long-Term Debt (Borrowings) (Details) (USD $)** | Dec. 31, 2014                                                                                                                                 | Dec. 31, 2013                                                                                                                                 | Dec. 31, 2012                                                                                                                                 |
|-----------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------|
| **Short-term borrowings:**                                                  |                                                                                                                                          |                                                                                                                                          |                                                                                                                                          |
| Retail customer repurchase agreements                                       | $ 9,076,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchase                                                                                  | $ 6,917,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchase                                                                                  | $ 8,675,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchase                                                                                  |
| Total short-term borrowings                                                 | 9,076,000us-gaap_ShortTermBorrowings                                                                                                          | 6,917,000us-gaap_ShortTermBorrowings                                                                                                          |                                                                                                                                          |
| **Long-term debt:**                                                         |                                                                                                                                          |                                                                                                                                          |                                                                                                                                          |
| Federal Home Loan Bank advances                                             | 68,234,000us-gaap_FederalHomeLoanBankAdvancesLongTerm                                                                                         | 73,283,000us-gaap_FederalHomeLoanBankAdvancesLongTerm                                                                                         |                                                                                                                                          |
| Long-term notes payable                                                     | 5,338,000us-gaap_LongTermNotesPayable                                                                                                         | 5,263,000us-gaap_LongTermNotesPayable                                                                                                         |                                                                                                                                          |
| Junior subordinated debt                                                    | 56,702,000us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust                                                              | 56,702,000us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust                                                              |                                                                                                                                          |
| Total long-term debt                                                        | $ 130,274,000us-gaap_LongTermDebt                                                                                                             | $ 135,248,000us-gaap_LongTermDebt                                                                                                             |                                                                                                                                          |
| FHLB advance [Member]                                                       |                                                                                                                                          |                                                                                                                                          |                                                                                                                                          |
| **Long-term debt:**                                                         |                                                                                                                                          |                                                                                                                                          |                                                                                                                                          |
| Long-term debt, weighted average interest rate at December 31               | 1.68%us-gaap_LongtermDebtWeightedAverageInterestRate/ us-gaap_LongtermDebtTypeAxis= us-gaap_FederalHomeLoanBankAdvancesMember                 | 1.80%us-gaap_LongtermDebtWeightedAverageInterestRate/ us-gaap_LongtermDebtTypeAxis= us-gaap_FederalHomeLoanBankAdvancesMember                 |                                                                                                                                          |
| Long term notes payable [Member]                                            |                                                                                                                                          |                                                                                                                                          |                                                                                                                                          |
| **Long-term debt:**                                                         |                                                                                                                                          |                                                                                                                                          |                                                                                                                                          |
| Long-term debt, weighted average interest rate at December 31               | 1.43%us-gaap_LongtermDebtWeightedAverageInterestRate/ us-gaap_LongtermDebtTypeAxis= us-gaap_NotesPayableOtherPayablesMember                   | 0.00%us-gaap_LongtermDebtWeightedAverageInterestRate/ us-gaap_LongtermDebtTypeAxis= us-gaap_NotesPayableOtherPayablesMember                   |                                                                                                                                          |
| Junior subordinated debt [Member]                                           |                                                                                                                                          |                                                                                                                                          |                                                                                                                                          |
| **Long-term debt:**                                                         |                                                                                                                                          |                                                                                                                                          |                                                                                                                                          |
| Long-term debt, weighted average interest rate at December 31               | 1.78%us-gaap_LongtermDebtWeightedAverageInterestRate/ us-gaap_LongtermDebtTypeAxis= us-gaap_JuniorSubordinatedDebtMember                      | 1.77%us-gaap_LongtermDebtWeightedAverageInterestRate/ us-gaap_LongtermDebtTypeAxis= us-gaap_JuniorSubordinatedDebtMember                      |                                                                                                                                          |
| Retail customer repurchase agreements [Member]                              |                                                                                                                                          |                                                                                                                                          |                                                                                                                                          |
| **Short-term borrowings:**                                                  |                                                                                                                                          |                                                                                                                                          |                                                                                                                                          |
| Short-term debt, 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 |

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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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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Weighted average interest rate of long-term debt outstanding.
+ References
No definition available.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Carrying value as of the balance sheet date of notes payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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.
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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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| - Definition
Weighted average interest rate of short-term debt outstanding.
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