| **Investment Securities (Amortized Cost and Approximate Fair Value of Securities) (Details) (USD $)In Thousands, unless otherwise specified** | Mar. 31, 2013 | Dec. 31, 2012 |
|-----------------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Gain (Loss) on Investments [Line Items]**                                                                                                   |          |          |
| Amortized Cost                                                                                                                                | $ 520,793     | $ 498,104     |
| Gross Unrealized Gains                                                                                                                        | 18,218        | 21,184        |
| Gross Unrealized Losses                                                                                                                       | 6,144         | 5,945         |
| Fair Value                                                                                                                                    | 532,867       | 513,343       |
| Amortized Cost                                                                                                                                | 336,696       | 361,020       |
| Gross Unrealized Gains                                                                                                                        | 14,807        | 17,170        |
| Gross Unrealized Losses                                                                                                                       | 64            | 16            |
| Fair Value                                                                                                                                    | 351,439       | 378,174       |
| Amortized Cost                                                                                                                                | 857,489       | 859,124       |
| Gross Unrealized Gains                                                                                                                        | 33,025        | 38,354        |
| Securities Gross Unrealized Losses                                                                                                            | 6,208         | 5,961         |
| Fair Value                                                                                                                                    | 884,306       | 891,517       |
| U.S. Government-sponsored agency securities                                                                                                   |          |          |
| **Gain (Loss) on Investments [Line Items]**                                                                                                   |          |          |
| Amortized Cost                                                                                                                                | 4,228         | 4,475         |
| Gross Unrealized Gains                                                                                                                        | 159           | 165           |
| Fair Value                                                                                                                                    | 4,387         | 4,640         |
| State and municipal                                                                                                                           |          |          |
| **Gain (Loss) on Investments [Line Items]**                                                                                                   |          |          |
| Amortized Cost                                                                                                                                | 151,379       | 148,187       |
| Gross Unrealized Gains                                                                                                                        | 8,615         | 10,025        |
| Gross Unrealized Losses                                                                                                                       | 122           | 18            |
| Fair Value                                                                                                                                    | 159,872       | 158,194       |
| Amortized Cost                                                                                                                                | 112,390       | 117,227       |
| Gross Unrealized Gains                                                                                                                        | 4,120         | 5,489         |
| Gross Unrealized Losses                                                                                                                       | 1             | 1             |
| Fair Value                                                                                                                                    | 116,509       | 122,715       |
| U.S. Government-sponsored mortgage-backed securities                                                                                          |          |          |
| **Gain (Loss) on Investments [Line Items]**                                                                                                   |          |          |
| Amortized Cost                                                                                                                                | 357,307       | 337,631       |
| Gross Unrealized Gains                                                                                                                        | 9,444         | 10,994        |
| Gross Unrealized Losses                                                                                                                       | 216           | 46            |
| Fair Value                                                                                                                                    | 366,535       | 348,579       |
| Amortized Cost                                                                                                                                | 224,306       | 243,793       |
| Gross Unrealized Gains                                                                                                                        | 10,687        | 11,681        |
| Gross Unrealized Losses                                                                                                                       | 63            | 15            |
| Fair Value                                                                                                                                    | 234,930       | 255,459       |
| Corporate obligations                                                                                                                         |          |          |
| **Gain (Loss) on Investments [Line Items]**                                                                                                   |          |          |
| Amortized Cost                                                                                                                                | 6,173         | 6,105         |
| Gross Unrealized Losses                                                                                                                       | 5,806         | 5,881         |
| Fair Value                                                                                                                                    | 367           | 224           |
| Equity Securities                                                                                                                             |          |          |
| **Gain (Loss) on Investments [Line Items]**                                                                                                   |          |          |
| Amortized Cost                                                                                                                                | 1,706         | 1,706         |
| Fair Value                                                                                                                                    | $ 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.
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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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