| **Disclosures About Fair Value of Assets and Liabilities - Fair Value Measurements of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) (USD $)In Thousands, unless otherwise specified** | Sep. 30, 2013 | Dec. 31, 2012 |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                  |          |          |
| Investment securities available for sale                                                                                                                                                                           | $ 606,341     | $ 513,343     |
| Fair Value, Measurements, Recurring | Fair Value | Interest rate swap liability                                                                                                                                    |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                  |          |          |
| Liability derivatives                                                                                                                                                                                              | 4,577         | 9,766         |
| Fair Value, Measurements, Recurring | Fair Value | U.S. Government-sponsored agency securities                                                                                                                     |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                  |          |          |
| Investment securities available for sale                                                                                                                                                                           | 3,800         | 4,640         |
| Fair Value, Measurements, Recurring | Fair Value | State and municipal                                                                                                                                             |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                  |          |          |
| Investment securities available for sale                                                                                                                                                                           | 202,182       | 158,194       |
| Fair Value, Measurements, Recurring | Fair Value | U.S. Government-sponsored mortgage-backed securities                                                                                                            |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                  |          |          |
| Investment securities available for sale                                                                                                                                                                           | 398,169       | 348,579       |
| Fair Value, Measurements, Recurring | Fair Value | Corporate obligations                                                                                                                                           |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                  |          |          |
| Investment securities available for sale                                                                                                                                                                           | 484           | 224           |
| Fair Value, Measurements, Recurring | Fair Value | Equity securities                                                                                                                                               |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                  |          |          |
| Investment securities available for sale                                                                                                                                                                           | 1,706         | 1,706         |
| Fair Value, Measurements, Recurring | Fair Value | Interest rate swap asset                                                                                                                                        |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                  |          |          |
| Asset derivatives                                                                                                                                                                                                  | 3,054         | 6,103         |
| Fair Value, Measurements, Recurring | Fair Value | Interest rate cap                                                                                                                                               |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                  |          |          |
| Asset derivatives                                                                                                                                                                                                  | 421           | 197           |
| Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swap liability                                                                                                 |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                  |          |          |
| Liability derivatives                                                                                                                                                                                              | 4,577         | 9,766         |
| Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. Government-sponsored agency securities                                                                                  |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                  |          |          |
| Investment securities available for sale                                                                                                                                                                           | 3,800         | 4,640         |
| Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | State and municipal                                                                                                          |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                  |          |          |
| Investment securities available for sale                                                                                                                                                                           | 181,672       | 140,094       |
| Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. Government-sponsored mortgage-backed securities                                                                         |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                  |          |          |
| Investment securities available for sale                                                                                                                                                                           | 398,169       | 348,579       |
| Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Equity securities                                                                                                            |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                  |          |          |
| Investment securities available for sale                                                                                                                                                                           | 1,702         | 1,702         |
| Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swap asset                                                                                                     |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                  |          |          |
| Asset derivatives                                                                                                                                                                                                  | 3,054         | 6,103         |
| Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate cap                                                                                                            |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                  |          |          |
| Asset derivatives                                                                                                                                                                                                  | 421           | 197           |
| Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Interest rate swap liability                                                                                                     |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                  |          |          |
| Liability derivatives                                                                                                                                                                                              |          |     |
| Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | State and municipal                                                                                                              |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                  |          |          |
| Investment securities available for sale                                                                                                                                                                           | 20,510        | 18,100        |
| Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Corporate obligations                                                                                                            |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                  |          |          |
| Investment securities available for sale                                                                                                                                                                           | 484           | 224           |
| Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Equity securities                                                                                                                |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                  |          |          |
| Investment securities available for sale                                                                                                                                                                           | 4             | 4             |
| Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Interest rate swap asset                                                                                                         |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                  |          |          |
| Asset derivatives                                                                                                                                                                                                  |          |     |
| Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Interest rate cap                                                                                                                |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                  |          |          |
| Asset derivatives                                                                                                                                                                                                  |          |     |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226000-175313Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226000-175313Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959
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| X                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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