| **Investment Securities - Amortized Cost and Approximate Fair Value of Securities (Details) (USD $)In Thousands, unless otherwise specified** | Jun. 30, 2013 | Dec. 31, 2012 |
|-----------------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Gain (Loss) on Investments [Line Items]**                                                                                                   |          |          |
| Amortized Cost - Available for sale securities                                                                                                | $ 587,021     | $ 498,104     |
| Gross Unrealized Gains - Available for sale securities                                                                                        | 10,748        | 21,184        |
| Gross Unrealized Losses - Available for sale securities                                                                                       | 13,176        | 5,945         |
| Fair Value - Available for sale securities                                                                                                    | 584,593       | 513,343       |
| Amortized Cost - Held to maturity securities                                                                                                  | 324,399       | 361,020       |
| Gross Unrealized Gains - Held to maturity securities                                                                                          | 7,598         | 17,170        |
| Gross Unrealized Losses - Held to maturity securities                                                                                         | 232           | 16            |
| Fair Value - Held to maturity securities                                                                                                      | 331,765       | 378,174       |
| Amortized Cost - Total Investment Securities                                                                                                  | 911,420       | 859,124       |
| Gross Unrealized Gains - Total Investment Securities                                                                                          | 18,346        | 38,354        |
| Gross Unrealized Losses - Total Investment Securities                                                                                         | 13,408        | 5,961         |
| Fair Value - Total Investment Securities                                                                                                      | 916,358       | 891,517       |
| U.S. Government-sponsored agency securities                                                                                                   |          |          |
| **Gain (Loss) on Investments [Line Items]**                                                                                                   |          |          |
| Amortized Cost - Available for sale securities                                                                                                | 4,022         | 4,475         |
| Gross Unrealized Gains - Available for sale securities                                                                                        | 40            | 165           |
| Fair Value - Available for sale securities                                                                                                    | 4,062         | 4,640         |
| State and municipal                                                                                                                           |          |          |
| **Gain (Loss) on Investments [Line Items]**                                                                                                   |          |          |
| Amortized Cost - Available for sale securities                                                                                                | 184,912       | 148,187       |
| Gross Unrealized Gains - Available for sale securities                                                                                        | 5,351         | 10,025        |
| Gross Unrealized Losses - Available for sale securities                                                                                       | 3,169         | 18            |
| Fair Value - Available for sale securities                                                                                                    | 187,094       | 158,194       |
| Amortized Cost - Held to maturity securities                                                                                                  | 115,943       | 117,227       |
| Gross Unrealized Gains - Held to maturity securities                                                                                          | 552           | 5,489         |
| Gross Unrealized Losses - Held to maturity securities                                                                                         | 11            | 1             |
| Fair Value - Held to maturity securities                                                                                                      | 116,484       | 122,715       |
| U.S. Government-sponsored mortgage-backed securities                                                                                          |          |          |
| **Gain (Loss) on Investments [Line Items]**                                                                                                   |          |          |
| Amortized Cost - Available for sale securities                                                                                                | 390,114       | 337,631       |
| Gross Unrealized Gains - Available for sale securities                                                                                        | 5,357         | 10,994        |
| Gross Unrealized Losses - Available for sale securities                                                                                       | 4,488         | 46            |
| Fair Value - Available for sale securities                                                                                                    | 390,983       | 348,579       |
| Amortized Cost - Held to maturity securities                                                                                                  | 208,456       | 243,793       |
| Gross Unrealized Gains - Held to maturity securities                                                                                          | 7,046         | 11,681        |
| Gross Unrealized Losses - Held to maturity securities                                                                                         | 221           | 15            |
| Fair Value - Held to maturity securities                                                                                                      | 215,281       | 255,459       |
| Corporate obligations                                                                                                                         |          |          |
| **Gain (Loss) on Investments [Line Items]**                                                                                                   |          |          |
| Amortized Cost - Available for sale securities                                                                                                | 6,267         | 6,105         |
| Gross Unrealized Losses - Available for sale securities                                                                                       | 5,519         | 5,881         |
| Fair Value - Available for sale securities                                                                                                    | 748           | 224           |
| Equity securities                                                                                                                             |          |          |
| **Gain (Loss) on Investments [Line Items]**                                                                                                   |          |          |
| Amortized Cost - Available for sale securities                                                                                                | 1,706         | 1,706         |
| Fair Value - Available for sale securities                                                                                                    | $ 1,706       | $ 1,706       |

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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.
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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.
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| - Definition
For an unclassified balance sheet, this item represents investments in debt securities which are categorized as held-to-maturity. The held-to-maturity category is for those securities that the entity has the positive intent and ability to hold until maturity.
+ References
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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.
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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.
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