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Securities - Trading Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading securities $ 4,127 $ 4,459
Corporate Equity Securities [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading securities 2,705 3,117
Certificates of Deposit [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading securities 253 408
International Mutual Funds [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading securities 259 287
Large Cap Growth Mutual Funds [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading securities 197 157
Money Market Mutual Funds [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading securities 124 110
Large Cap Value Mutual Funds [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading securities 129 104
Corporate Notes and Bonds [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading securities 152 101
Real Estate Investment Trust Mutual Funds [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading securities 39 65
U.S. Government Sponsored Entities [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading securities 52 58
Small Cap Mutual Funds [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading securities 83 26
Mid Cap Mutual Funds [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading securities 84 26
Commodities Mutual Funds [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading securities $ 50 $ 0