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Available-For-Sale Securities Adjusted cost (Detail) (USD $)
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost $ 66,960,000 $ 66,514,000    
Unrealized Gains 1,619,000 1,442,000    
Unrealized Losses (131,000) (263,000)    
Accrued Interest 123,000 109,000    
Estimated Fair Value 68,571,000 67,802,000    
Cash & Cash Equivalents 32,019,000 36,382,000 44,405,000 39,937,000
Investment Securities 36,552,000 31,420,000    
Cash
        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 30,971,000 30,958,000    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Accrued Interest 0 0    
Estimated Fair Value 30,971,000 30,958,000    
Cash & Cash Equivalents 30,971,000 30,958,000    
Investment Securities 0 0    
Fair Value, Inputs, Level 1
        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 23,410,000 24,037,000    
Unrealized Gains 1,428,000 1,265,000    
Unrealized Losses (117,000) (216,000)    
Accrued Interest 29,000 26,000    
Estimated Fair Value 24,750,000 25,112,000    
Cash & Cash Equivalents 1,048,000 5,424,000    
Investment Securities 23,702,000 19,688,000    
Fair Value, Inputs, Level 1 | Money Market Accounts
        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 1,048,000 5,424,000    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Accrued Interest 0 0    
Estimated Fair Value 1,048,000 5,424,000    
Cash & Cash Equivalents 1,048,000 5,424,000    
Investment Securities 0 0    
Fair Value, Inputs, Level 1 | Mutual Funds
        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 9,917,000 7,887,000    
Unrealized Gains 212,000 127,000    
Unrealized Losses (52,000) (164,000)    
Accrued Interest 0 0    
Estimated Fair Value 10,077,000 7,850,000    
Cash & Cash Equivalents 0 0    
Investment Securities 10,077,000 7,850,000    
Fair Value, Inputs, Level 1 | Corporate Equity Securities
        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 4,776,000 4,614,000    
Unrealized Gains 1,122,000 1,076,000    
Unrealized Losses (52,000) (9,000)    
Accrued Interest 0 0    
Estimated Fair Value 5,846,000 5,681,000    
Cash & Cash Equivalents 0 0    
Investment Securities 5,846,000 5,681,000    
Fair Value, Inputs, Level 1 | Government Agency Securities
        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 7,669,000 6,112,000    
Unrealized Gains 94,000 62,000    
Unrealized Losses (13,000) (43,000)    
Accrued Interest 29,000 26,000    
Estimated Fair Value 7,779,000 6,157,000    
Cash & Cash Equivalents 0 0    
Investment Securities 7,779,000 6,157,000    
Fair Value, Inputs, Level 2
        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 12,579,000 11,519,000    
Unrealized Gains 191,000 177,000    
Unrealized Losses (14,000) (47,000)    
Accrued Interest 94,000 83,000    
Estimated Fair Value 12,850,000 11,732,000    
Cash & Cash Equivalents 0 0    
Investment Securities 12,850,000 11,732,000    
Fair Value, Inputs, Level 2 | Municipal Bonds
        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 4,412,000 3,524,000    
Unrealized Gains 104,000 103,000    
Unrealized Losses (6,000) 0    
Accrued Interest 37,000 25,000    
Estimated Fair Value 4,547,000 3,652,000    
Cash & Cash Equivalents 0 0    
Investment Securities 4,547,000 3,652,000    
Fair Value, Inputs, Level 2 | Corporate Bonds
        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 8,167,000 7,995,000    
Unrealized Gains 87,000 74,000    
Unrealized Losses (8,000) (47,000)    
Accrued Interest 57,000 58,000    
Estimated Fair Value 8,303,000 8,080,000    
Cash & Cash Equivalents 0 0    
Investment Securities $ 8,303,000 $ 8,080,000