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Schedule of Credit Losses Recognized in Earnings (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Schedule of Available-for-sale Securities [Line Items]        
Balance at beginning of period $ 50 $ 86 $ 54 $ 86
Additions where no OTTI was previously recorded            
Additions where an OTTI was previously recorded            
Reductions for securities for which the company intends to sell or more likely than not will be required to sell before recovery            
Reductions reflecting increases in expected cash flows to be collected            
Reductions for securities sold during the period   (32) (4) (32)
Balance at end of period $ 50 $ 54 $ 50 $ 54