| **Investment Securities Amortized Cost and Estimated Fair Value of Available for Sale Securities (Details) (USD $)** | Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2012 |
|----------------------------------------------------------------------------------------------------------------------|---------------|---------------|---------------|
| **Schedule of Available-for-sale Securities [Line Items]**                                                           |          |          |          |
| Amortized Cost                                                                                                       | $ 293,016,000 | $ 279,399,000 | $ 295,768,000 |
| Unrealized Gains                                                                                                     | 4,032,000     | 12,753,000    | 12,015,000    |
| Unrealized Losses                                                                                                    | (9,313,000)   | (538,000)     | (436,000)     |
| Fair Value (Estimated)                                                                                               | 287,735,000   | 291,614,000   | 307,347,000   |
| Collateralized Mortgage Backed Securities [Member]                                                                   |          |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                           |          |          |          |
| Amortized Cost                                                                                                       | 157,023,000   | 164,752,000   | 201,552,000   |
| Unrealized Gains                                                                                                     | 2,014,000     | 4,636,000     | 5,677,000     |
| Unrealized Losses                                                                                                    | (1,513,000)   | (295,000)     | (250,000)     |
| Fair Value (Estimated)                                                                                               | 157,524,000   | 169,093,000   | 206,979,000   |
| US States and Political Subdivisions Debt Securities [Member]                                                        |          |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                           |          |          |          |
| Amortized Cost                                                                                                       | 134,376,000   | 113,069,000   | 92,353,000    |
| Unrealized Gains                                                                                                     | 1,955,000     | 8,074,000     | 6,291,000     |
| Unrealized Losses                                                                                                    | (7,792,000)   | (199,000)     | (51,000)      |
| Fair Value (Estimated)                                                                                               | 128,539,000   | 120,944,000   | 98,593,000    |
| Equity Securities, Other [Member]                                                                                    |          |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                           |          |          |          |
| Amortized Cost                                                                                                       | 1,617,000     | 1,578,000     | 1,863,000     |
| Unrealized Gains                                                                                                     | 63,000        | 43,000        | 47,000        |
| Unrealized Losses                                                                                                    | (8,000)       | (44,000)      | (135,000)     |
| Fair Value (Estimated)                                                                                               | $ 1,672,000   | $ 1,577,000   | $ 1,775,000   |

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| - Definition
Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This item represents the gross unrealized losses for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.
+ References
No definition available.
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