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Reclassifications Out of Company's AOCI (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net gain (loss) on sale of securities $ 113 $ (9) $ 230 $ 42
Amortization of prior service costs 82 69 163 134
Income before income taxes 7,972 6,075 18,509 14,928
Income tax expense 2,537 1,997 5,933 4,849
Net income 5,435 4,078 12,576 10,079
Amounts reclassified from AOCI 122   246  
Available-for-Sale Securities
        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Amounts reclassified from AOCI 71   144  
Defined Benefit Pension Plan Items
        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Amounts reclassified from AOCI 51   102  
Reclassification out of Accumulated Other Comprehensive Income
        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Amounts reclassified from AOCI 122   246  
Reclassification out of Accumulated Other Comprehensive Income | Available-for-Sale Securities
        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net gain (loss) on sale of securities 113   230  
Net impairment losses recognized in earnings          
Income before income taxes 113   230  
Income tax expense 42   86  
Net income 71   144  
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 70 [1]   139 [1]  
Amortization of net losses 12 [1]   24 [1]  
Income before income taxes 82   163  
Income tax expense 31   61  
Net income $ 51   $ 102  
[1] These items are included in the computation of net periodic pension cost. See Note 8, "Defined Benefit Plans," for additional information.