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Summary of Accumulated Other Comprehensive Loss, Net of Income Taxes (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income, Unrealized Gains (Losses) on Available-for-Sale Securities Beginning balance $ (283)  
Other comprehensive income before reclassifications, Unrealized Gains (Losses) on Available-for-Sale Securities (971)  
Amounts reclassified from AOCI, Unrealized Gains (Losses) on Available-for-Sale Securities 73  
Net comprehensive loss, Unrealized Gains (Losses) on Available-for-Sale Securities (898)  
Accumulated other comprehensive income, Unrealized Gains (Losses) on Available-for-Sale Securities Ending balance (1,181)  
Accumulated other comprehensive income, Defined Benefit Pension Plan Items, Beginning balance (1,542)  
Other comprehensive income before reclassifications, Defined Benefit Pension Plan Items (248)  
Amounts reclassified from AOCI, Defined Benefit Pension Plan Items 51  
Net comprehensive loss, Defined Benefit Pension Plan Items (197)  
Accumulated other comprehensive income, Defined Benefit Pension Plan Items, Ending balance (1,739)  
Accumulated other comprehensive income, Beginning balance (1,825)  
Other comprehensive income before reclassifications (1,219)  
Amounts reclassified from AOCI 124  
Net comprehensive loss (1,095) 433
Accumulated other comprehensive income, Ending balance $ (2,920)