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Fair Value (Unrealized Losses Included in Assets Measured in Condensed Consolidated Statements of Condition at Fair Value on Recurring Basis) (Detail) (Fair Value, Inputs, Level 3 [Member], USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Fair Value, Inputs, Level 3 [Member]
 
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Balance at January 1, 2014 $ 1,413
Principal redemption (352)
Total unrealized losses included in other comprehensive income (loss) 116
Balance at September 30, 2014 $ 1,177