| **Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands** | Total      | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss), net [Member] | Treasury Stock [Member] |
|---------------------------------------------------------------------------------------------------------------|------------|-----------------------|-------------------------------------|----------------------------|-------------------------------------------------------------|-------------------------|
| Beginning balance at Dec. 31, 2013                                                                            | $ 711,697  | $ 105,563             | $ 365,333                           | $ 334,748                  | $ (20,588)                                                  | $ (73,359)              |
| Beginning balance, shares at Dec. 31, 2013                                                                    |       | 95,245,215            |                                |                       |                                                        |                    |
| Net Income                                                                                                    | 36,724     |                  |                                | 36,724                     |                                                        |                    |
| Other comprehensive income (loss)                                                                             | 10,912     |                  |                                |                       | 10,912                                                      |                    |
| Dividends, declared (USD per share)                                                                           | (19,754)   |                  |                                | (19,754)                   |                                                        |                    |
| Discount on dividend reinvestment plan purchases                                                              | (65)       |                  | (65)                                |                       |                                                        |                    |
| Treasury stock acquired                                                                                       | (30,928)   |                  |                                |                       |                                                        | (30,928)                |
| Treasury stock acquired, shares                                                                               |       | (3,633,513)           |                                |                       |                                                        |                    |
| Treasury stock reissued                                                                                       | 192        |                  | 35                                  | 0                          |                                                        | 157                     |
| Treasury stock reissued, shares                                                                               |       | 21,960                |                                |                       |                                                        |                    |
| Restricted stock                                                                                              | 706        | $ 0                   | 273                                 | 0                          |                                                        | 433                     |
| Restricted stock, shares                                                                                      |       | 88,987                |                                |                       |                                                        |                    |
| Ending balance at Sep. 30, 2014                                                                               | 709,484    | $ 105,563             | 365,576                             | 351,718                    | (9,676)                                                     | (103,697)               |
| Ending balance, shares at Sep. 30, 2014                                                                       |       | 91,722,649            |                                |                       |                                                        |                    |
| Beginning balance at Dec. 31, 2014                                                                            | $ 716,145  | $ 105,563             | 365,615                             | 353,027                    | (4,499)                                                     | (103,561)               |
| Beginning balance, shares at Dec. 31, 2014                                                                    | 91,723,028 | 91,723,028            |                                |                       |                                                        |                    |
| Net Income                                                                                                    | $ 40,082   |                  |                                | 40,082                     |                                                        |                    |
| Other comprehensive income (loss)                                                                             | 9,460      |                  |                                |                       | 9,460                                                       |                    |
| Dividends, declared (USD per share)                                                                           | (18,862)   |                  |                                | (18,862)                   |                                                        |                    |
| Treasury stock acquired                                                                                       | (25,383)   |                  |                                |                       |                                                        | (25,383)                |
| Treasury stock acquired, shares                                                                               |       | (2,918,066)           |                                |                       |                                                        |                    |
| Treasury stock reissued                                                                                       | 192        |                  | 32                                  | 0                          |                                                        | 160                     |
| Treasury stock reissued, shares                                                                               |       | 20,936                |                                |                       |                                                        |                    |
| Restricted stock                                                                                              | 1,134      | $ 0                   | 303                                 | 0                          |                                                        | 831                     |
| Restricted stock, shares                                                                                      |       | 135,370               |                                |                       |                                                        |                    |
| Ending balance at Sep. 30, 2015                                                                               | $ 722,768  | $ 105,563             | $ 365,950                           | $ 374,247                  | $ 4,961                                                     | $ (127,953)             |
| Ending balance, shares at Sep. 30, 2015                                                                       | 88,961,268 | 88,961,268            |                                |                       |                                                        |                    |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow associated with the 5% discount on the shares issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity.
+ References
No definition available.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Changes in additional paid in capital related to exercise of share-based payments awards (such as stock options) and the amount of recognized equity-based compensation during the period (such as nonvested shares).
+ References
No definition available.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after tax and reclassification adjustments of other comprehensive income (loss).
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of treasury shares (units) reissued during the period, excluding reissuance of shares (units) held in treasury used to satisfy equity-based compensation obligations exercised by the holders of such rights. Upon reissuance of shares (units) from treasury, either the common or preferred stock (unit) reissued is outstanding.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Equity impact of the value of treasury stock (units) reissued during the period, excluding reissuance of shares (units) held in treasury used to satisfy equity-based compensation obligations exercised by the holders of such rights. Upon reissuance of shares (units) from treasury, either the common or preferred stock (unit) reissued is outstanding.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of shares that have been repurchased during the period and are being held in treasury.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.
+ References
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