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Short-Term Borrowings and Long-Term Debt (Detail) - Long term debt (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2011
Balance (in Dollars)	$ 47,204	$ 47,204	$ 47,204
Rate	6.96%	6.96%	6.96%
Junior Subordinated Debt [Member]
Balance (in Dollars)	46,392	46,392	46,392
Rate	7.00%	7.00%	7.00%
Other Long-term Debt [Member]
Balance (in Dollars)	$ 812	$ 812	$ 812
Rate	4.59%	4.59%	4.59%

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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