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Related Party Transactions - Farm Credit Bank of Texas (Details) - Farm Credit Bank of Texas [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Related Party Transaction [Line Items]      
Revenue from Related Parties $ 1.0 $ 1.0 $ 1.1
Related Party Transaction, Expenses from Transactions with Related Party $ 0.2 0.2 $ 0.3
Common Class B [Member]      
Related Party Transaction [Line Items]      
Common Stock Ownership Percentage by a Related Party 7.70%    
Guarantee Obligations [Member]      
Related Party Transaction [Line Items]      
Related Party Transactions, Outstanding Balance $ 226.5 $ 250.3