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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
Mar. 31, 2015
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale $ 538,055us-gaap_AvailableForSaleSecurities $ 549,543us-gaap_AvailableForSaleSecurities
Significant Other Observable Inputs (Level 2)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 531,857us-gaap_AvailableForSaleSecurities
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Significant Unobservable Inputs (Level 3)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 6,198us-gaap_AvailableForSaleSecurities
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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 8,569us-gaap_DerivativeFairValueOfDerivativeLiability
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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 107us-gaap_AvailableForSaleSecurities
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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 255,421us-gaap_AvailableForSaleSecurities
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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 274,627us-gaap_AvailableForSaleSecurities
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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 1,702us-gaap_AvailableForSaleSecurities
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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 4,764us-gaap_DerivativeFairValueOfDerivativeAsset
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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 87us-gaap_DerivativeFairValueOfDerivativeAsset
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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 6,163us-gaap_AvailableForSaleSecurities
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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 31us-gaap_AvailableForSaleSecurities
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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 4us-gaap_AvailableForSaleSecurities
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Fair Value | Fair Value, Measurements, Recurring | Interest rate swap liability    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Liability Derivatives 8,569us-gaap_DerivativeFairValueOfDerivativeLiability
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Fair Value | Fair Value, Measurements, Recurring | U.S. Government-sponsored agency securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 107us-gaap_AvailableForSaleSecurities
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Fair Value | Fair Value, Measurements, Recurring | State and municipal    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 261,584us-gaap_AvailableForSaleSecurities
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Fair Value | Fair Value, Measurements, Recurring | U.S. Government-sponsored mortgage-backed securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 274,627us-gaap_AvailableForSaleSecurities
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Fair Value | Fair Value, Measurements, Recurring | Corporate obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 31us-gaap_AvailableForSaleSecurities
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Fair Value | Fair Value, Measurements, Recurring | Equity securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 1,706us-gaap_AvailableForSaleSecurities
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Fair Value | Fair Value, Measurements, Recurring | Interest rate swap asset    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Asset derivatives 4,764us-gaap_DerivativeFairValueOfDerivativeAsset
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Fair Value | Fair Value, Measurements, Recurring | Interest rate cap    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Asset derivatives $ 87us-gaap_DerivativeFairValueOfDerivativeAsset
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