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Fair Value Measurements - Change in Fair Value for Financial Instruments (Detail) (Significant Unobservable Inputs (Level 3) [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Loan Securities Carried at Fair Value [Member]
     
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Fair value, Beginning Balance $ 11 $ 5,309 $ 11,981
Purchases         
Sale/repayment    (6,359) (662)
Payoff at par     (8,748)
Realized gain    614   
Unrealized gain 215 447 2,738
Transfers in and/or out of Level 3         
Fair value, Ending Balance 226 11 5,309
The amount of total gains or losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at the reporting date   23  
Securities Carried at Fair Value Total [Member]
     
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
The amount of total gains or losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at the reporting date $ 215