Fair Value Measurements - Reconciliation of Items Using Level Three Inputs (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013
Auction Rate Security
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 1,400,000
Impairments	(288,000)
Redemptions and sales	(200,000)
Ending balance	912,000
Mortgage Servicing Rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value adjustments	579,145
Ending balance	$ 579,145