| **Investment Securities (Details) (USD $)In Thousands, unless otherwise specified** | Sep. 30, 2013 | Dec. 31, 2012 |
|-------------------------------------------------------------------------------------|---------------|---------------|
| **Available-for-sale Securities [Abstract]**                                        |          |          |  |
| Amortized cost                                                                      | $ 456,310     | $ 558,818     | [1] |
| Gross unrealized gains                                                              | 2,775         | 7,451         |  |
| Gross unrealized losses                                                             | 19,373        | 1,419         |  |
| Estimated fair value                                                                | 439,712       | 564,850       | [1] |
| **Held-to-maturity Securities [Abstract]**                                          |          |          |  |
| Amortized cost                                                                      | 153,684       |          |  |
| Gross unrealized gains                                                              | 0             |          |  |
| Gross unrealized losses                                                             | 7,210         |          |  |
| Estimated fair value                                                                | 146,474       |          |  |
| Amortized cost, Total                                                               | 609,994       |          |  |
| Gross unrealized gains, Total                                                       | 2,775         |          |  |
| Gross unrealized losses, Total                                                      | 26,583        |          |  |
| Estimated fair value, Total                                                         | 586,186       |          |  |
| Obligations of U.S. Treasury and government agencies [Member]                       |          |          |  |
| **Available-for-sale Securities [Abstract]**                                        |          |          |  |
| Amortized cost                                                                      |          | 6,646         |  |
| Gross unrealized gains                                                              |          | 335           |  |
| Gross unrealized losses                                                             |          | 0             |  |
| Estimated fair value                                                                |          | 6,981         |  |
| Obligations of U.S. government sponsored enterprises [Member]                       |          |          |  |
| **Available-for-sale Securities [Abstract]**                                        |          |          |  |
| Amortized cost                                                                      | 2,057         | 22,118        |  |
| Gross unrealized gains                                                              | 25            | 55            |  |
| Gross unrealized losses                                                             | 0             | 0             |  |
| Estimated fair value                                                                | 2,082         | 22,173        |  |
| Obligations of states and political subdivisions [Member]                           |          |          |  |
| **Available-for-sale Securities [Abstract]**                                        |          |          |  |
| Amortized cost                                                                      |          | 5,918         |  |
| Gross unrealized gains                                                              |          | 120           |  |
| Gross unrealized losses                                                             |          | 0             |  |
| Estimated fair value                                                                |          | 6,038         |  |
| Residential mortgage-backed securities - GSE [Member]                               |          |          |  |
| **Available-for-sale Securities [Abstract]**                                        |          |          |  |
| Amortized cost                                                                      | 373,860       | 436,344       |  |
| Gross unrealized gains                                                              | 945           | 5,678         |  |
| Gross unrealized losses                                                             | 17,358        | 948           |  |
| Estimated fair value                                                                | 357,447       | 441,074       |  |
| **Held-to-maturity Securities [Abstract]**                                          |          |          |  |
| Amortized cost                                                                      | 143,611       |          |  |
| Gross unrealized gains                                                              | 0             |          |  |
| Gross unrealized losses                                                             | 6,556         |          |  |
| Estimated fair value                                                                | 137,055       |          |  |
| Residential mortgage-backed securities - Private [Member]                           |          |          |  |
| **Available-for-sale Securities [Abstract]**                                        |          |          |  |
| Amortized cost                                                                      | 20,484        | 22,649        |  |
| Gross unrealized gains                                                              | 784           | 750           |  |
| Gross unrealized losses                                                             | 10            | 454           |  |
| Estimated fair value                                                                | 21,258        | 22,945        |  |
| Commercial mortgage-backed securities - GSE [Member]                                |          |          |  |
| **Available-for-sale Securities [Abstract]**                                        |          |          |  |
| Amortized cost                                                                      | 22,863        | 23,150        |  |
| Gross unrealized gains                                                              | 0             | 209           |  |
| Gross unrealized losses                                                             | 1,219         | 0             |  |
| Estimated fair value                                                                | 21,644        | 23,359        |  |
| Commercial mortgage-backed securities - Private [Member]                            |          |          |  |
| **Available-for-sale Securities [Abstract]**                                        |          |          |  |
| Amortized cost                                                                      | 10,419        | 5,283         |  |
| Gross unrealized gains                                                              | 0             | 34            |  |
| Gross unrealized losses                                                             | 786           | 0             |  |
| Estimated fair value                                                                | 9,633         | 5,317         |  |
| **Held-to-maturity Securities [Abstract]**                                          |          |          |  |
| Amortized cost                                                                      | 10,073        |          |  |
| Gross unrealized gains                                                              | 0             |          |  |
| Gross unrealized losses                                                             | 654           |          |  |
| Estimated fair value                                                                | 9,419         |          |  |
| Business Development Company investment [Member]                                    |          |          |  |
| **Available-for-sale Securities [Abstract]**                                        |          |          |  |
| Amortized cost                                                                      | 1,753         |          |  |
| Gross unrealized gains                                                              | 887           |          |  |
| Gross unrealized losses                                                             | 0             |          |  |
| Estimated fair value                                                                | 2,640         |          |  |
| Corporate notes [Member]                                                            |          |          |  |
| **Available-for-sale Securities [Abstract]**                                        |          |          |  |
| Amortized cost                                                                      | 24,874        | 36,710        |  |
| Gross unrealized gains                                                              | 134           | 270           |  |
| Gross unrealized losses                                                             | 0             | 17            |  |
| Estimated fair value                                                                | $ 25,008      | $ 36,963      |  |
|                                                                                     |
| [1]Derived from audited consolidated financial statements                           |

| X                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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+ References
No definition available.
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+ References
No definition available.
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| - Definition
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+ References
No definition available.
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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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| X                                                                                                                                                                                                                                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of debt and equity financial instruments classified as either held-to-maturity or available-for-sale.
+ References
No definition available.
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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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| X                                                                                                                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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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| X                                                                                                                                                                                                                                                                                                                                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of investments in debt securities categorized as held-to-maturity valued at amortized cost, excludes other than temporary impairment (OTTI).
+ References
No definition available.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This item represents the aggregate fair value of investments in debt securities as of the balance sheet date and which are categorized as held-to-maturity.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
As of the balance sheet date, the excess of fair value over carrying value (amortized cost) of a debt security categorized as held-to-maturity, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding gain.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
As of the balance sheet date, the excess of carrying value (amortized cost) over fair value of a debt security categorized as held-to-maturity, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding loss.
+ References
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