| **Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands** | 6 Months Ended |
|-------------------------------------------------------------------------------|----------------|
||
| Total [Member]                                                                |           |   |
| **Accumulated Other Comprehensive Income (Loss) [Roll Forward]**              |           |   |
| Beginning balance January 1, 2016                                             | $ (10,739)     | $ (7,475) |
| Other comprehensive income (loss) before reclassifications                    | 6,245          | (2,578) |
| Amounts reclassified from accumulated other comprehensive income              | 4              | 4 |
| Net current period other comprehensive income (loss)                          | 6,249          | (2,574) |
| Ending balance June 30, 2016                                                  | (4,490)        | (10,049) |
| Unrealized Gains (Losses) on Available-For-Sale Securities [Member]           |           |   |
| **Accumulated Other Comprehensive Income (Loss) [Roll Forward]**              |           |   |
| Beginning balance January 1, 2016                                             | (5,176)        | (3,017) |
| Other comprehensive income (loss) before reclassifications                    | 6,989          | (2,515) |
| Amounts reclassified from accumulated other comprehensive income              | 0              | 0 |
| Net current period other comprehensive income (loss)                          | 6,989          | (2,515) |
| Ending balance June 30, 2016                                                  | 1,813          | (5,532) |
| Interest Rate Swaps [Member]                                                  |           |   |
| **Accumulated Other Comprehensive Income (Loss) [Roll Forward]**              |           |   |
| Beginning balance January 1, 2016                                             | (466)          | (324) |
| Other comprehensive income (loss) before reclassifications                    | (690)          | (63) |
| Amounts reclassified from accumulated other comprehensive income              | 4              | 4 |
| Net current period other comprehensive income (loss)                          | (686)          | (59) |
| Ending balance June 30, 2016                                                  | (1,152)        | (383) |
| Defined Benefit Plan Items [Member]                                           |           |   |
| **Accumulated Other Comprehensive Income (Loss) [Roll Forward]**              |           |   |
| Beginning balance January 1, 2016                                             | (5,097)        | (4,134) |
| Other comprehensive income (loss) before reclassifications                    | (54)           | 0 |
| Amounts reclassified from accumulated other comprehensive income              | 0              | 0 |
| Net current period other comprehensive income (loss)                          | (54)           | 0 |
| Ending balance June 30, 2016                                                  | $ (5,151)      | $ (4,134) |

| X                                                                                                                                                                                                                                                                                                                                         |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after tax, before reclassification adjustments of other comprehensive income (loss).
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after tax and reclassification adjustments of other comprehensive income (loss).
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after tax of reclassification adjustments of other comprehensive income (loss).
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.
+ References
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