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Reclassifications Out of Company's AOCI (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net (loss) gain on sale of securities $ (39) $ 228 $ 191 $ 270
Amortization of prior service costs 82 67 245 201
Income before income taxes 7,951 15,381 26,460 30,309
Income tax (benefit) expense 2,539 5,322 8,472 10,171
Net income 5,412 10,059 17,988 20,138
Amounts reclassified from AOCI 27   273  
Available-for-Sale Securities
        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Amounts reclassified from AOCI (24)   120  
Defined Benefit Pension Plan Items
        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Amounts reclassified from AOCI 51   153  
Reclassification out of Accumulated Other Comprehensive Income
        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Amounts reclassified from AOCI 27   273  
Reclassification out of Accumulated Other Comprehensive Income | Available-for-Sale Securities
        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net (loss) gain on sale of securities (39)   191  
Net impairment losses recognized in earnings          
Income before income taxes (39)   191  
Income tax (benefit) expense (15)   71  
Net income (24)   120  
Reclassification out of Accumulated Other Comprehensive Income | Defined Benefit Pension Plan Items
        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Amortization of prior service costs 69 [1]   208 [1]  
Amortization of net losses 13 [1]   37 [1]  
Income before income taxes 82   245  
Income tax (benefit) expense 31   92  
Net income $ 51   $ 153  
[1] These items are included in the computation of net periodic pension cost. See Note 8, "Defined Benefit Plans," for additional information.