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Label Element Value
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnEquityOrNetAssets1 $ (2,099,000)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1 797,177,000
Additional Paid-in Capital [Member]  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1 $ 119,304,000
Common Stock [Member]  
Shares, Outstanding us-gaap_SharesOutstanding 10,712,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1 $ 10,712,000
Preferred Stock [Member]  
Shares, Outstanding us-gaap_SharesOutstanding 9,400,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1 $ 228,374,000
Retained Earnings [Member]  
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnEquityOrNetAssets1 (2,099,000)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1 454,948,000
AOCI Including Portion Attributable to Noncontrolling Interest [Member]  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1 (16,161,000)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Rural Utilities [Member]  
Allowance for Loan and Lease Losses, Real Estate us-gaap_AllowanceForLoanAndLeaseLossesRealEstate 0
Cumulative Effect, Period of Adoption, Adjustment [Member] | Farm & Ranch [Member]  
Allowance for Loan and Lease Losses, Real Estate us-gaap_AllowanceForLoanAndLeaseLossesRealEstate 0
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Rural Utilities [Member]  
Allowance for Loan and Lease Losses, Real Estate us-gaap_AllowanceForLoanAndLeaseLossesRealEstate 0
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Farm & Ranch [Member]  
Allowance for Loan and Lease Losses, Real Estate us-gaap_AllowanceForLoanAndLeaseLossesRealEstate 7,017,000
Accounting Standards Update 2016-13 [Member] | Rural Utilities [Member]  
Reserve for losses agm_ReserveForLosses 0
Accounting Standards Update 2016-13 [Member] | Farm & Ranch [Member]  
Reserve for losses agm_ReserveForLosses $ 0