CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest Income:
Residential whole loans	$ 4,083	$ 0	$ 0
Cash and cash equivalent investments	89	124	127
Interest Income	463,817	482,940	499,157
Interest Expense:
Repurchase agreements	145,244	143,885	148,767
Securitized debt	6,533us-gaap_InterestExpenseDebt	12,100us-gaap_InterestExpenseDebt	17,106us-gaap_InterestExpenseDebt
Senior Notes	8,031	8,028	5,797
Interest Expense	159,808us-gaap_InterestExpense	164,013us-gaap_InterestExpense	171,670us-gaap_InterestExpense
Net Interest Income	304,009us-gaap_InterestIncomeExpenseNet	318,927us-gaap_InterestIncomeExpenseNet	327,487us-gaap_InterestIncomeExpenseNet
Other-Than-Temporary Impairments:
Total other-than-temporary impairment losses	0	0	(879)
Portion of loss reclassed from other comprehensive loss	0	0	(321)
Net Impairment Losses Recognized in Earnings	0	0	(1,200)
Other Income, net:
Unrealized net gains and net interest income from Linked Transactions	17,092mfa_GainOnLinkedTransactions	3,225mfa_GainOnLinkedTransactions	12,610mfa_GainOnLinkedTransactions
Gain on residential whole loans held at fair value	447	0	0
Losses on TBA short positions	0	(7,517)	0
Gain on sales of MBS and U.S. Treasury securities, net	37,497	25,825	9,001
Other, net	(251)us-gaap_OtherOperatingIncomeExpenseNet	219us-gaap_OtherOperatingIncomeExpenseNet	10us-gaap_OtherOperatingIncomeExpenseNet
Other Income, net	54,785us-gaap_NoninterestIncome	21,752us-gaap_NoninterestIncome	21,621us-gaap_NoninterestIncome
Operating and Other Expense:
Compensation and benefits	25,581us-gaap_LaborAndRelatedExpense	20,328us-gaap_LaborAndRelatedExpense	22,089us-gaap_LaborAndRelatedExpense
Other general and administrative expense	15,164	13,361	11,480
Excise tax and interest	1,162mfa_ExciseTaxesandInterestExpense	2,250mfa_ExciseTaxesandInterestExpense	7,500mfa_ExciseTaxesandInterestExpense
Impairment of resecuritization related costs	0us-gaap_AssetImpairmentCharges	2,031us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges
Other investment related operating expenses	3,383us-gaap_OtherCostAndExpenseOperating	0us-gaap_OtherCostAndExpenseOperating	0us-gaap_OtherCostAndExpenseOperating
Operating and Other Expense	45,290us-gaap_CostsAndExpenses	37,970us-gaap_CostsAndExpenses	41,069us-gaap_CostsAndExpenses
Net Income	313,504us-gaap_NetIncomeLoss	302,709us-gaap_NetIncomeLoss	306,839us-gaap_NetIncomeLoss
Less Preferred Stock Dividends	15,000	13,750	8,160
Less Issuance Costs of Redeemed Preferred Stock	0us-gaap_PreferredStockRedemptionPremium	3,947us-gaap_PreferredStockRedemptionPremium	0us-gaap_PreferredStockRedemptionPremium
Net Income Available to Common Stock and Participating Securities	298,504	285,012	298,679
Earnings per Common Share - Basic and Diluted (in dollars per share)	$ 0.81us-gaap_EarningsPerShareBasicAndDiluted	$ 0.78us-gaap_EarningsPerShareBasicAndDiluted	$ 0.83us-gaap_EarningsPerShareBasicAndDiluted
Agency MBS
Interest Income:
Mortgage backed securities	142,543	156,046	196,058
Non-Agency MBS
Interest Income:
Mortgage backed securities	316,330	326,770	302,972
Non-Agency MBS \| Non-Agency MBS
Interest Income:
Mortgage backed securities	185,806	170,485	134,901
Non-Agency MBS \| Non-Agency MBS Transfered to Consolidated VIEs
Interest Income:
Mortgage backed securities	130,524	156,285	168,071
CRT securities
Interest Income:
Mortgage backed securities	$ 772	$ 0	$ 0

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