Related Party Transactions - AgFirst Farm Credit Bank (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Related Party Transaction [Line Items]
Common Stock Ownership Percentage by a Related Party	5.00%
AgFirst Farm Credit Bank [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Other Revenues from Transactions with Related Party	$ 100,000	$ 500,000	$ 500,000
Revenue from Related Parties	600,000	700,000	800,000
Accounts Receivable, Related Parties, Current	100,000	100,000
Common Class B, Voting [Member] | AgFirst Farm Credit Bank [Member]
Related Party Transaction [Line Items]
Common Stock Ownership Percentage by a Related Party	16.80%
Guarantee Obligations [Member] | AgFirst Farm Credit Bank [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Purchases from Related Party	19,700,000	8,100,000	16,800,000
Related Party Transactions, Outstanding Balance	112,800,000	131,800,000
Performance Guarantee [Member] | AgFirst Farm Credit Bank [Member]
Related Party Transaction [Line Items]
Related Party Transactions, Outstanding Balance	$ 28,900,000	$ 121,900,000