Debt Schedule of Long-term Debt instruments (Details) (Junior Subordinated Debt [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
ACST II [Member]
Debt Instrument [Line Items]
Balance at December 31,	$ 10,000	$ 10,000
Period-End Interest Rate	3.51%	3.52%
ACST III [Member]
Debt Instrument [Line Items]
Balance at December 31,	$ 10,000	$ 10,000
Period-End Interest Rate	2.36%	2.37%