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Reclassifications Out of Accumulated Other Comprehensive Income (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net gain on sale of securities $ 45 $ 117
Income before income taxes 8,286 10,537
Income tax (benefit) expense 2,561 3,396
Net income 5,725 7,141
Reclassified from AOCI, net of tax (177) 22
Available-for-Sale Securities
    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassified from AOCI, net of tax (137) 73
Employee Benefit Plan
    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassified from AOCI, net of tax (40) (51)
Reclassification out of Accumulated Other Comprehensive Income
    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassified from AOCI, net of tax (177) 23
Reclassification out of Accumulated Other Comprehensive Income | Available-for-Sale Securities
    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net gain on sale of securities 45 117
Net impairment losses (264)  
Income before income taxes (219) 117
Income tax (benefit) expense (82) 44
Net income (137) 73
Reclassification out of Accumulated Other Comprehensive Income | Employee Benefit Plan
    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Amortization of prior service cost (65) [1] (69) [1]
Amortization of gains   (12) [1]
Income before income taxes (65) (81)
Income tax (benefit) expense (25) (30)
Net income $ (40) $ (51)
[1] Amortization is included in net periodic pension cost. See Note 10, "Employee Benefit Plans."