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Long-Term Borrowings - Summary of long-term Borrowings (Detail 1) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Debt Instruments [Abstract]
2017	$ 10,000,000
2018	10,000,000
Long-term borrowings	$ 20,000,000us-gaap_LongTermDebt	$ 20,000,000us-gaap_LongTermDebt	$ 20,000,000us-gaap_LongTermDebt

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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