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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Investment securities available-for-sale, Carrying Value $ 328,484 $ 346,420
US Government-Sponsored Enterprises (GSEs) and Agency-Backed Securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Investment securities available-for-sale, Carrying Value 113,145 130,567
Obligations of States and Political Subdivisions [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Investment securities available-for-sale, Carrying Value 23,064 14,264
Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Investment securities available-for-sale, Carrying Value 328,484 346,420
Loans held for sale 10,076 9,466
Other assets 25,543 17,331
Total assets at fair value 364,103 373,217
Fair Value Measurements Recurring [Member] | Models with Significant Observable Market Parameters (Level 2) [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Investment securities available-for-sale, Carrying Value 328,484 346,420
Loans held for sale 10,076 9,466
Total assets at fair value 338,560 355,886
Fair Value Measurements Recurring [Member] | Models with Significant Unobservable Market Parameters (Level 3) [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Other assets 25,543 17,331
Total assets at fair value 25,543 17,331
Fair Value Measurements Recurring [Member] | US Government-Sponsored Enterprises (GSEs) and Agency-Backed Securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Investment securities available-for-sale, Carrying Value 113,145 130,567
Fair Value Measurements Recurring [Member] | US Government-Sponsored Enterprises (GSEs) and Agency-Backed Securities [Member] | Models with Significant Observable Market Parameters (Level 2) [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Investment securities available-for-sale, Carrying Value 113,145 130,567
Fair Value Measurements Recurring [Member] | Mortgage Backed Securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Investment securities available-for-sale, Carrying Value 163,158 171,069
Fair Value Measurements Recurring [Member] | Mortgage Backed Securities [Member] | Models with Significant Observable Market Parameters (Level 2) [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Investment securities available-for-sale, Carrying Value 163,158 171,069
Fair Value Measurements Recurring [Member] | Asset-backed Securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Investment securities available-for-sale, Carrying Value 29,117 30,520
Fair Value Measurements Recurring [Member] | Asset-backed Securities [Member] | Models with Significant Observable Market Parameters (Level 2) [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Investment securities available-for-sale, Carrying Value 29,117 30,520
Fair Value Measurements Recurring [Member] | Obligations of States and Political Subdivisions [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Investment securities available-for-sale, Carrying Value 23,064 14,264
Fair Value Measurements Recurring [Member] | Obligations of States and Political Subdivisions [Member] | Models with Significant Observable Market Parameters (Level 2) [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Investment securities available-for-sale, Carrying Value $ 23,064 $ 14,264