Capstead Mortgage (CMO) 10-K 28 Feb 14 2013 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2013	Feb. 28, 2014	Jun. 28, 2013
Document and Entity Information [Abstract]	'	'	'
Entity Registrant Name	'CAPSTEAD MORTGAGE CORP	'	'
Entity Central Index Key	'0000766701	'	'
Current Fiscal Year End Date	'--12-31	'	'
Entity Well-known Seasoned Issuer	'Yes	'	'
Entity Voluntary Filers	'No	'	'
Entity Current Reporting Status	'Yes	'	'
Entity Filer Category	'Large Accelerated Filer	'	'
Entity Public Float	'	'	$1,139,155,262
Entity Common Stock, Shares Outstanding	'	95,767,180	'
Document Fiscal Year Focus	'2013	'	'
Document Fiscal Period Focus	'FY	'	'
Document Type	'10-K	'	'
Amendment Flag	'false	'	'
Document Period End Date	31-Dec-13	'	'

CONSOLIDATED_BALANCE_SHEETS

CONSOLIDATED BALANCE SHEETS (USD $)	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified					Cumulative Preferred Stock, Series A [Member]	Cumulative Preferred Stock, Series A [Member]	Convertible Preferred Stock [Member]	Convertible Preferred Stock [Member]	Redeemable Preferred Stock [Member]	Redeemable Preferred Stock [Member]
							Cumulative Convertible Preferred Stock, Series B [Member]	Cumulative Convertible Preferred Stock, Series B [Member]	Cumulative Redeemable Preferred Stock, Series E [Member]	Cumulative Redeemable Preferred Stock, Series E [Member]
Assets:	'		'		'	'	'	'	'	'
Residential mortgage investments($13.12 and $13.45 billion pledged under repurchase arrangements at December 31, 2013 and 2012, respectively)	$13,475,874	[1]	$13,860,158	[1]	'	'	'	'	'	'
Cash collateral receivable from interest rate swap counterparties	25,502		49,972		'	'	'	'	'	'
Interest rate swap agreements at fair value	5,005		169		'	'	'	'	'	'
Cash and cash equivalents	413,356		425,445		'	'	'	'	'	'
Receivables and other assets	96,231		130,402		'	'	'	'	'	'
Investments in unconsolidated affiliates	0		3,117		'	'	'	'	'	'
Total Assets	14,015,968		14,469,263		'	'	'	'	'	'
Liabilities:	'		'		'	'	'	'	'	'
Repurchase arrangements and similar borrowings	12,482,900		12,784,238		'	'	'	'	'	'
Interest rate swap agreements at fair value	11,304		32,868		'	'	'	'	'	'
Unsecured borrowings	100,000		103,095		'	'	'	'	'	'
Common stock dividend payable	30,872		29,512		'	'	'	'	'	'
Accounts payable and accrued expenses	25,109		22,425		'	'	'	'	'	'
Total Liabilities	12,650,185		12,972,138		'	'	'	'	'	'
Stockholders' equity:	'		'		'	'	'	'	'	'
Cumulative Preferred Stock	'		'		0	2,604	0	186,388	165,756	0
Common stock - $0.01 par value; 250,000 shares authorized: 95,807 and 96,229 shares issued and outstanding at December 31, 2013 and December 31, 2012, respectively	958		962		'	'	'	'	'	'
Paid-in capital	1,329,792		1,367,199		'	'	'	'	'	'
Accumulated deficit	-349,866		-353,938		'	'	'	'	'	'
Accumulated other comprehensive income	219,143		293,910		'	'	'	'	'	'
Stockholders' Equity Attributable to Parent	1,365,783		1,497,125		'	'	'	'	'	'
Total Liabilities and Equity	$14,015,968		$14,469,263		'	'	'	'	'	'
[1]	Includes unrealized gains and losses for residential mortgage investments classified as available-for-sale (see NOTE 9).

CONSOLIDATED_BALANCE_SHEETS_Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
In Thousands, except Per Share data, unless otherwise specified			Cumulative Preferred Stock, Series A [Member]	Cumulative Preferred Stock, Series A [Member]	Convertible Preferred Stock [Member]	Convertible Preferred Stock [Member]	Redeemable Preferred Stock [Member]	Redeemable Preferred Stock [Member]
					Cumulative Convertible Preferred Stock, Series B [Member]	Cumulative Convertible Preferred Stock, Series B [Member]	Cumulative Redeemable Preferred Stock, Series E [Member]	Cumulative Redeemable Preferred Stock, Series E [Member]
Residential mortgage investments	$13,123,757	$13,453,159	'	'	'	'	'	'
Preferred stock, par value (in dollars per share)	$0.10	$0.10	'	'	'	'	'	'
Preferred stock, shares authorized (in shares)	100,000	100,000	'	'	'	'	'	'
Preferred stock, dividend rate (in dollars per share)	'	'	$1.60	$1.60	$1.26	$1.26	'	'
Preferred stock, dividend rate (in hundredths)	'	'	'	'	'	'	7.50%	'
Preferred stock, shares issued (in shares)	'	'	0	186	0	16,493	6,861	0
Preferred stock, shares outstanding (in shares)	'	'	0	186	0	16,493	6,861	0
Preferred stock, aggregate liquidation preference	'	'	'	'	'	'	$171,521	$0
Common stock, par value (in dollars per share)	$0.01	$0.01	'	'	'	'	'	'
Common stock, shares authorized (in shares)	250,000	250,000	'	'	'	'	'	'
Common stock, shares issued (in shares)	95,807	96,229	'	'	'	'	'	'
Common stock, shares outstanding (in shares)	95,807	96,229	'	'	'	'	'	'

CONSOLIDATED_STATEMENTS_OF_INC

CONSOLIDATED STATEMENTS OF INCOME (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Interest income:	'		'		'
Residential mortgage investments	$215,137		$255,931		$243,077
Other	322		698		301
Interest Income	215,459		256,629		243,378
Interest expense:	'		'		'
Repurchase arrangements and similar borrowings	-66,368		-69,101		-57,328
Unsecured borrowings	-8,736		-8,747		-8,747
Other	0		0		-5
Interest expense	-75,104		-77,848		-66,080
Net interest income (expense)	140,355		178,781		177,298
Other revenue (expense):	'		'		'
Salaries and benefits	-5,776		-5,929		-5,741
Short-term incentive compensation	-3,565		-5,043		-6,657
Other general and administrative expense	-4,476		-4,271		-3,932
Miscellaneous other revenue (expense)	-300		-171		-1,023
Operating expenses	-14,117		-15,414		-17,353
Income before equity in earnings of unconsolidated affiliates	126,238		163,367		159,945
Equity in earnings of unconsolidated affiliates	249		259		259
Net income	126,487		163,626		160,204
Net income available to common stockholders:	'		'		'
Net income	126,487		163,626		160,204
Less dividends paid on preferred shares	-17,536		-21,021		-20,369
Less redemption preference premiums paid	-19,924	[1]	0	[1]	0	[1]
Net income (loss) available to common stockholders, basic, total	$89,027		$142,605		$139,835
Net income per common share:	'		'		'
Basic (in dollars per share)	$0.93		$1.50		$1.76
Diluted (in dollars per share)	$0.93		$1.50		$1.75
[1]	The Series A and Series B preferred shares were redeemed on June 13, 2013 (See NOTE 11).

CONSOLIDATED_STATEMENTS_OF_COM

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other comprehensive income (loss)	'	'	'
Net income	$126,487	$163,626	$160,204
Amounts related to available-for-sale securities:	'	'	'
Change in net unrealized gains	-101,001	91,750	54,263
Reclassification adjustment for amounts included in net income	0	0	62
Amounts related to cash flow hedges:	'	'	'
Change in net unrealized gains (losses)	9,320	-22,262	-51,751
Reclassification adjustment for amounts included in net income	16,914	19,882	28,066
Other comprehensive income (loss)	-74,767	89,370	30,640
Comprehensive income	$51,720	$252,996	$190,844

CONSOLIDATED_STATEMENTS_OF_STO

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)	Preferred Stock [Member]	Common Stock [Member]	Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income [Member]	Total
In Thousands, unless otherwise specified
Beginning Balance at Dec. 31, 2010	$179,323	$703	$1,028,382	($354,883)	$173,900	$1,027,425
Net income	0	0	0	160,204	0	160,204
Change in unrealized gain on mortgage securities, net	0	0	0	0	54,325	54,325
Amounts related to cash flow hedges, net	0	0	0	0	-23,685	-23,685
Cash dividends:	'	'	'	'	'	'
Common	0	0	-5,407	-139,835	0	-145,242
Preferred	0	0	0	-20,369	0	-20,369
Redemption of Series A and B preferred stock	'	'	'	'	'	0
Conversion of preferred stock	-15	0	15	0	0	0
Additions to capital	5,206	180	234,663	0	0	240,049
Ending Balance at Dec. 31, 2011	184,514	883	1,257,653	-354,883	204,540	1,292,707
Net income	0	0	0	163,626	0	163,626
Change in unrealized gain on mortgage securities, net	0	0	0	0	91,750	91,750
Amounts related to cash flow hedges, net	0	0	0	0	-2,380	-2,380
Cash dividends:	'	'	'	'	'	'
Common	0	0	-1,785	-141,660	0	-143,445
Preferred	0	0	0	-21,021	0	-21,021
Redemption of Series A and B preferred stock	'	'	'	'	'	0
Conversion of preferred stock	-1	0	1	0	0	0
Additions to capital	4,479	109	146,362	0	0	150,950
Common share repurchases	0	-30	-35,032	0	0	-35,062
Ending Balance at Dec. 31, 2012	188,992	962	1,367,199	-353,938	293,910	1,497,125
Net income	0	0	0	126,487	0	126,487
Change in unrealized gain on mortgage securities, net	0	0	0	0	-101,001	-101,001
Amounts related to cash flow hedges, net	0	0	0	0	26,234	26,234
Cash dividends:	'	'	'	'	'	'
Common	0	0	-13,830	-104,932	0	-118,762
Preferred	0	0	0	-17,536	0	-17,536
Redemption of Series A and B preferred stock	-187,109	0	-19,924	0	0	-207,033
Conversion of preferred stock	-1,883	2	1,881	0	0	0
Issuance of Series E preferred stock	165,756	0	0	0	0	165,756
Other capital stock transactions	0	0	1,752	53	0	1,805
Common share repurchases	0	-6	-7,286	0	0	-7,292
Ending Balance at Dec. 31, 2013	$165,756	$958	$1,329,792	($349,866)	$219,143	$1,365,783

CONSOLIDATED_STATEMENTS_OF_STO1

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
CONSOLIDATED STATEMENTS OF STOCKHOLDERS EQUITY [Abstract]	'	'	'
Common per share (in dollars per share)	$1.24	$1.49	$1.76

CONSOLIDATED_STATEMENTS_OF_CAS

CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating activities:	'	'	'
Net income	$126,487	$163,626	$160,204
Noncash items:	'	'	'
Amortization of investment premiums	125,872	96,677	68,077
Depreciation and other amortization	162	195	206
Amortization of equity-based awards	2,201	2,236	1,821
Incentive compensation paid in common shares	0	2,799	1,446
Change in measureable hedge ineffectiveness related to interest rate swap agreements designated as cash flow hedges	-168	-411	306
Impairment related to real estate held for sale	0	0	470
Gain on sales of real estate held for sale	0	-273	-114
Net change in receivables, other assets, accounts payable and accrued expenses	6,658	-919	5,297
Net cash provided by operating activities	261,212	263,930	237,713
Investing activities:	'	'	'
Purchases of residential mortgage investments	-3,326,345	-4,384,866	-5,899,041
Interest receivable acquired with the purchase of residential mortgage investments	-5,559	-7,180	-12,099
Proceeds from asset sales	0	2,010	10,786
Principal collections on residential mortgage investments, including changes in mortgage securities principal remittance receivable	3,516,634	2,756,772	2,110,334
Net cash provided by (used in) investing activities	184,730	-1,633,264	-3,790,020
Financing activities:	'	'	'
Proceeds from repurchase arrangements and similar borrowings	136,909,245	127,808,676	88,814,514
Principal payments on repurchase arrangements and similar borrowings	-137,210,576	-126,376,876	-85,254,811
Decrease (increase) in cash collateral receivable from interest rate swap counterparties	24,470	-1,467	-13,216
Decrease in cash collateral payable to interest rate swap counterparties	0	0	-9,024
Cash paid to redeem Series A & B preferred shares	-207,033	0	0
Common share repurchases	-7,292	-35,062	0
Proceeds from capital raising activities:	'	'	'
Issuance of preferred shares	165,756	4,479	5,206
Issuance of common shares	0	142,035	231,674
Other capital stock transactions	-410	-585	-69
Dividends paid	-132,191	-173,138	-154,840
Net cash (used in) provided by financing activities	-458,031	1,368,062	3,619,434
Net change in cash and cash equivalents	-12,089	-1,272	67,127
Cash and cash equivalents at beginning of year	425,445	426,717	359,590
Cash and cash equivalents at end of year	$413,356	$425,445	$426,717

BUSINESS

BUSINESS	12 Months Ended
	Dec. 31, 2013
BUSINESS [Abstract]	'
BUSINESS	'
	NOTE 1 ¾ BUSINESS
	Capstead Mortgage Corporation operates as a self-managed real estate investment trust for federal income tax purposes (a “REIT”) and is based in Dallas, Texas.  Unless the context otherwise indicates, Capstead Mortgage Corporation, together with its subsidiaries, is referred to as “Capstead” or the “Company.”  Capstead earns income from investing in a leveraged portfolio of residential mortgage pass-through securities consisting almost exclusively of adjustable-rate mortgage (“ARM”) securities issued and guaranteed by government-sponsored enterprises, either Fannie Mae or Freddie Mac (together, the “GSEs”), or by an agency of the federal government, Ginnie Mae.  Residential mortgage pass-through securities guaranteed by the GSEs or Ginnie Mae, referred to as “Agency Securities,” are considered to have limited, if any, credit risk.

ACCOUNTING_POLICIES

ACCOUNTING POLICIES	12 Months Ended
	Dec. 31, 2013
ACCOUNTING POLICIES [Abstract]	'
ACCOUNTING POLICIES	'
	NOTE 2 ¾ ACCOUNTING POLICIES
	Basis of Presentation
	The consolidated financial statements include the accounts of Capstead Mortgage Corporation and its wholly-owned and majority-owned subsidiaries over which it exercises control.  Capstead also consolidates, if appropriate, any variable interest entities in which it holds an interest.  Common securities held by the Company in statutory trusts organized to issue long-term unsecured borrowings (prior to the dissolution of these trusts in December 2013 – see NOTE 5) were not considered variable interests at risk pursuant to variable interest entity accounting principles and were accounted for as investments in unconsolidated affiliates.  Investments in any unconsolidated affiliates are initially recorded at cost and subsequently adjusted for the Company’s equity in earnings and losses and cash contributions and distributions.  Intercompany balances and transactions have been eliminated.  Prior year amounts included in financing activities in the Statement of Cash Flows pertaining to capital stock transactions have been reclassified to conform to the current year presentation.  Additionally, prior year compensation costs related to dividend equivalent rights (see NOTE 12) have been reclassified from Salaries and benefits to Short-term incentive compensation in the Statement of Income.
	Recent Accounting Developments
	In December 2011 the Financial Accounting Standards Board (“FASB”) issued ASU No. 2011-11, Disclosures about Offsetting Assets and Liabilities.  In January 2013, the FASB issued ASU No. 2013-01, Clarifying the Scope of Disclosures about Offsetting Assets and Liabilities.  The Company adopted the requirements of ASU No. 2011-11 as amended by ASU No. 2013-01 with its first quarterly filing in 2013.
	In February 2013 the FASB issued Accounting Standards Update (“ASU”) No. 2013-02, Comprehensive Income (Topic 220):  Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income that amended ASU No. 2011-12 and ASU No. 2011-05.  The Company adopted the requirements of ASU No. 2013-02 with its first quarterly filing in 2013.
	The provisions of these ASUs are all disclosure-related and as such, their adoption by the Company had no effect on its results of operations, financial condition, or cash flows.
	Use of Estimates
	The use of estimates is inherent in the preparation of financial statements.  Amortization of investment premiums on financial assets is based on estimates of future mortgage prepayments, which are impacted by future changes in interest rates and other factors.  Actual results could differ from those estimates, which could adversely affect earnings.  Fair values of financial instruments are estimated using available market information and appropriate valuation methodologies; however, considerable judgment is required in interpreting market data to develop these estimates.  Fair values fluctuate on a daily basis and are influenced by changes in, and market expectations for changes in, interest rates, market liquidity conditions and levels of mortgage prepayments, as well as other factors.  Accordingly, estimates of fair value are as of the balance sheet dates and are not necessarily indicative of the amounts that could be realized in a current market exchange.  The use of different market assumptions and estimation methodologies may have a material effect on estimated fair values.  Considerable judgment is also exercised in making impairment conclusions and estimating impairment charges.
	Cash and Cash Equivalents
	Cash and cash equivalents include unrestricted cash on hand and highly liquid investments with original maturities of three months or less when purchased.
	Financial Assets
	Most of Capstead’s financial assets are mortgage securities classified as available-for-sale and carried at fair value with unrealized gains and losses reported as a separate component of Accumulated other comprehensive income.  Loans classified as held for investment or mortgage securities classified as held-to-maturity are carried at amortized cost (unpaid principal balance, adjusted for unamortized investment premiums and discounts).  Interest is recorded as income when earned.  Investment premiums and discounts are recognized as adjustments to interest income by the interest method, generally over the expected life of the related financial assets. Realized gains and losses from sales are recorded as a component of Miscellaneous other revenue (expense).  The specific identification method is used to determine the cost of financial assets sold.  Financial assets are reviewed for potential impairment at each balance sheet date.  Other-than-temporary impairments of investments in mortgage securities can occur with adverse changes in the financial condition of the issuer and changes in the Company’s intent or ability to hold the security until any declines in fair value are recovered.  The amount of any such other-than-temporary impairment for an investment in a mortgage security is measured by comparing the recorded amount of the security to its fair value.  Impairment charges are recorded as a component of Miscellaneous other revenue (expense).
	Borrowings
	Borrowings are carried at amortized cost (unpaid principal balances, net of unamortized discounts and premiums, when present).  Discounts and premiums, as well as debt issue costs, which are recorded in Receivables and other assets, are recognized as adjustments to interest expense by the interest method over the term of the related borrowings.  Borrowings under repurchase arrangements create exposure to the potential for failure on the part of counterparties to honor their commitment to return pledged collateral.  In the event of a default by a counterparty, the Company may have difficulty recovering its collateral.  To mitigate this risk, the Company monitors the creditworthiness of its counterparties and manages its exposure to any single counterparty.
	Derivative Financial Instruments (“Derivatives”)
	Derivatives used by Capstead for risk management purposes are carried at fair value as assets or liabilities.  The accounting for changes in fair value of each Derivative held depends on whether it has been designated as a hedge for accounting purposes, as well as the type of hedging relationship identified.  Capstead will typically designate any Derivatives held as cash flow hedges.  To qualify as a cash flow hedge, at the inception of the hedge relationship the Company must document that the hedge relationship is anticipated to be highly effective and monitor ongoing effectiveness on at least a quarterly basis.  As long as the hedge relationship remains effective, the effective portion of changes in fair value of the Derivative is recorded in Accumulated other comprehensive income and the ineffective portion is recorded in interest expense.  The effective portion of changes in fair value is reclassified from Accumulated comprehensive income to earnings over the term of the Derivative primarily in the form of Derivative cash flows that are either in excess of or lower than market rates.  Changes in fair value of Derivatives not held as accounting hedges, if any, or for which the hedge relationship is no longer considered highly effective, are recorded in Miscellaneous other revenue (expense).
	Holding Derivatives creates exposure to credit risk related to the potential for failure on the part of counterparties to honor their commitments.  In addition, the Company is required to post collateral based on any declines in the market value of the Derivatives.  In the event of default by a counterparty, the Company may have difficulty recovering its collateral and may not receive payments provided for under the terms of the Derivative.  To mitigate this risk, the Company uses only well-established commercial banks as counterparties.  The Company uses interest rate swap agreements in cash flow hedge relationships in order to hedge variability in borrowing rates due to changes in the underlying benchmark interest rate related to a designated portion of its current and anticipated future borrowings.  Variable-rate swap payments to be received and any measured hedge ineffectiveness are recorded in interest expense as an offset to interest owed on the hedged borrowings that reset to market rates generally every 30 to 90 days.  Fixed-rate swap payments to be made are also recorded in interest expense.  The combination of these cash flows results in a relatively fixed rate on these borrowings, subject to certain adjustments.  These adjustments include changes in spreads between variable rates on the swap agreements and actual borrowing rates as well as the effects of measured hedge ineffectiveness.
	Cash collateral receivable from interest rate swap counterparties represents cash remitted to swap counterparties to meet initial and ongoing margin requirements that are based on the fair value of these Derivatives, including related interest receivable or payable under the terms of the agreements.  The Company may also remit mortgage securities to certain of its swap counterparties to meet ongoing margin requirements.  Such mortgage securities, if any, are included in Residential mortgage investments.  Similarly, Cash collateral payable to interest rate swap counterparties represents cash received from counterparties to meet margin call requirements.  For presentation purposes, the Company does not offset individual counterparty collateral receivables (or payables) with the recorded fair value of related interest rate swap agreements pursuant to master netting arrangements.  In addition, gross unrealized gains on Derivatives (recorded as assets) are stated separately from gross unrealized losses (recorded as liabilities) without regard to counterparty.
	Equity-based Compensation
	Equity-based compensation cost is measured at the fair value of the awards on the grant date and recognized as expense over the related requisite service or performance measurement periods.  Compensation cost for option awards is recognized on a straight-line basis over the requisite service period for each portion of an award that vests separately.  Compensation cost for stock awards subject only to service conditions is recognized on a straight-line basis over the requisite service period for the awards.  Compensation cost for stock awards and restricted stock units subject to performance conditions is recognized on a straight-line basis over the requisite measurement periods, subject to achieving the related performance conditions.
	Income Taxes
	Capstead Mortgage Corporation and its qualified REIT subsidiaries (“Capstead REIT”) have elected to be taxed as a REIT.  As a result, Capstead REIT is not taxed on taxable income distributed to stockholders if certain REIT qualification tests are met.  Capstead’s policy is to distribute 100% of the taxable income of the REIT, after application of available tax attributes, within the time limits prescribed by the Internal Revenue Code (the “Code”), which may extend into the subsequent taxable year.  The Company may find it advantageous from time to time to elect taxable REIT subsidiary status for certain of its subsidiaries in which case taxable income of any such subsidiary would be subject to federal and, where applicable, state or local income taxes.  Any such income taxes are accounted for using the liability method.  Related deferred income tax assets and liabilities are determined based on differences between the financial reporting and tax bases of assets and liabilities and are measured using enacted tax rates and laws that will be in effect when the differences are expected to reverse.  The Company has not recognized any liabilities for unrecognized tax benefits using a “more likely than not” threshold for the recognition and measurement of the financial statement effects of tax positions taken on a tax return filing.  Should any such liabilities be recognized in future periods, the Company will record related interest and penalties in Other general and administrative expense.
	Dividend Classification
	Capstead records common and preferred share dividends in the Accumulated deficit component of Stockholders’ equity only to the extent of available earnings for the related period.  Any dividends declared in excess of available earnings are considered a return of capital for financial reporting purposes and are recorded as reductions of Paid-in capital.  The tax and financial reporting classification of dividends can differ primarily as a result of differences between taxable income and Net income and how taxable income is allocated to dividends paid.

NET_INCOME_PER_COMMON_SHARE

NET INCOME PER COMMON SHARE	12 Months Ended
	Dec. 31, 2013
NET INCOME PER COMMON SHARE [Abstract]	'
NET INCOME PER COMMON SHARE	'
	NOTE 3 ¾ NET INCOME PER COMMON SHARE
	Basic net income per common share is computed by dividing net income, after deducting preferred share dividends and adjusting for the impact of unvested stock awards deemed to be participating securities, by the weighted average number of common shares outstanding, calculated excluding unvested stock awards.
	Diluted net income per common share is computed by dividing net income available to common stockholders, after adding dividends on the Company’s Series A and B convertible preferred shares when such shares were dilutive, by the basic weighted average number of common shares and common share equivalents outstanding, giving effect to equity awards and these convertible preferred shares when such awards and shares were dilutive.  Prior to their redemption on June 13, 2013, the Series A and B preferred shares were considered dilutive whenever basic net income per common share exceeded each Series’ dividend divided by the conversion rates applicable for that period.  Shares of the Company’s 7.50% Series E Cumulative Redeemable Preferred Stock issued in 2013 are contingently convertible into common shares only upon the occurrence of a change in control and are therefore not presently considered dilutive securities.  Unvested stock awards that are deemed participating securities are included in the calculation of diluted net income per common share, if dilutive, under either the two class method or the treasury stock method, depending upon which method produces the more dilutive result.
	Components of the computation of basic and diluted net income per common share were as follows for the indicated periods (dollars in thousands, except per share amounts):
			Year ended December 31
			2013			2012			2011
	Basic net income per common share
	Numerator for basic net income per common share:
	Net income		$	126,487		$	163,626		$	160,204
	Preferred share dividends			(17,536	)		(21,021	)		(20,369	)
	Redemption preference premiums paid on Series A and Series B preferred shares*			(19,924	)		–			–
	Unvested stock award participation in earnings			(139	)		(372	)		(579	)
			$	88,888		$	142,233		$	139,256
	Denominator for basic net income per common share:
	Weighted average common shares outstanding			95,679			95,115			79,784
	Average unvested stock awards outstanding			(506	)		(522	)		(468	)
				95,173			94,593			79,316
			$	0.93		$	1.5		$	1.76
	Diluted net income per common share
	Numerator for diluted net income per common share:
	Net income available to common stockholders		$	88,888		$	142,233		$	139,256
	Dividends on dilutive convertible preferred shares			44			298			298
			$	88,932		$	142,531		$	139,554
	Denominator for diluted net income per common share:
	Basic weighted average common shares outstanding			95,173			94,593			79,316
	Net effect of dilutive stock and option awards			145			111			71
	Net effect of dilutive convertible preferred shares			75			308			309
				95,393			95,012			79,696
			$	0.93		$	1.5		$	1.75
		*	The Series A and Series B preferred shares were redeemed on June 13, 2013 (See NOTE 11).
	Potentially dilutive securities excluded from the computation of net income per share because the effect of inclusion was antidilutive during the indicated periods were as follows (in thousands):
			Year ended December 31
			2013			2012			2011
	Antidilutive convertible preferred shares*			16,539			16,493			16,184
	Antidilutive equity awards excludable under the treasury stock method:
	Shares issuable under option awards			30			10			40
	Restricted stock units			243			–			–
		*	The Series A and Series B preferred shares were redeemed on June 13, 2013 (See NOTE 11).

RESIDENTIAL_MORTGAGE_INVESTMEN

RESIDENTIAL MORTGAGE INVESTMENTS	12 Months Ended
	Dec. 31, 2013
RESIDENTIAL MORTGAGE INVESTMENTS [Abstract]	'
RESIDENTIAL MORTGAGE INVESTMENTS	'
	NOTE 4 ¾ RESIDENTIAL MORTGAGE INVESTMENTS
	Residential mortgage investments classified by collateral type and interest rate characteristics were as follows as of the indicated dates (dollars in thousands):
			Unpaid		Investment		Amortized		Carrying		Net			Average
			Principal		Premiums		Cost Basis		Amount (a)		WAC (b)			Yield(b)
			Balance
	31-Dec-13
	Agency Securities:
	Fannie Mae/Freddie Mac:
	Fixed-rate		$	2,158	$	6	$	2,164	$	2,167		6.67	%		6.4	%
	ARMs			10,675,620		343,452		11,019,072		11,231,057		2.58			1.59
	Ginnie Mae ARMs			2,145,639		74,396		2,220,035		2,233,495		2.64			1.57
				12,823,417		417,854		13,241,271		13,466,719		2.59			1.59
	Residential mortgage loans:
	Fixed-rate			2,633		3		2,636		2,636		6.99			5.62
	ARMs			4,244		18		4,262		4,262		3.81			3.46
				6,877		21		6,898		6,898		5.03			4.27
	Collateral for structured financings			2,220		37		2,257		2,257		8.09			7.34
			$	12,832,514	$	417,912	$	13,250,426	$	13,475,874		2.59			1.59
	31-Dec-12
	Agency Securities:
	Fannie Mae/Freddie Mac:
	Fixed-rate		$	3,194	$	9	$	3,203	$	3,208		6.7			6.52
	ARMs			11,547,954		356,646		11,904,600		12,198,922		2.69			1.91
	Ginnie Mae ARMs			1,566,749		48,248		1,614,997		1,647,119		2.77			2.11
				13,117,897		404,903		13,522,800		13,849,249		2.7			1.94
	Residential mortgage loans:
	Fixed-rate			3,007		5		3,012		3,012		7.01			6.54
	ARMs			5,031		20		5,051		5,051		3.87			3.75
				8,038		25		8,063		8,063		5.04			4.78
	Collateral for structured financings			2,799		47		2,846		2,846		8.12			7.47
			$	13,128,734	$	404,975	$	13,533,709	$	13,860,158		2.71			1.94
	(a)	Includes unrealized gains and losses for residential mortgage investments classified as available-for-sale (see NOTE 9).
	(b)	Net WAC, or weighted average coupon, is the weighted average interest rate of the mortgage loans underlying the indicated investments net of servicing and other fees as of the indicated balance sheet date.  Net WAC is expressed as a percentage calculated on an annualized basis on the unpaid principal balances of the mortgage loans underlying these investments.  Average yield is presented for the year then ended, and is based on the cash component of interest income expressed as a percentage calculated on an annualized basis on average amortized cost basis (the “cash yield”) less the effects of amortizing investment premiums.  Investment premium amortization is determined using the interest method and incorporates actual and anticipated future mortgage prepayments.
	Because of federal government support for the GSEs, Agency Securities are considered to have limited, if any, credit risk.  Residential mortgage loans held by the Company were originated prior to 1995 when Capstead operated a mortgage conduit and the related credit risk is borne by the Company.  Collateral for structured financings consists of private residential mortgage securities that are backed by loans obtained through this mortgage conduit and are pledged to secure repayment of related structured financings.  Credit risk for these securities is borne by the related bondholders.  The maturity of Residential mortgage investments is directly affected by prepayments of principal on the underlying mortgage loans.  Consequently, actual maturities will be significantly shorter than the portfolio’s weighted average contractual maturity of 289 months.
	Fixed-rate investments consist of residential mortgage loans and Agency Securities backed by residential mortgage loans with fixed rates of interest.  Adjustable-rate investments generally are ARM Agency Securities backed by residential mortgage loans that have coupon interest rates that adjust at least annually to more current interest rates or begin doing so after an initial fixed-rate period.  After the initial fixed-rate period, if applicable, mortgage loans underlying ARM securities either (i) adjust annually based on specified margins over the one-year Constant Maturity U.S. Treasury Note Rate (“CMT”) or the one-year London interbank offered rate (“LIBOR”), (ii) adjust semiannually based on specified margins over six-month LIBOR, or (iii) adjust monthly based on specified margins over indices such as one-month LIBOR, the Eleventh District Federal Reserve Bank Cost of Funds Index, or over a rolling twelve month average of the one-year CMT index, usually subject to periodic and lifetime limits, or caps, on the amount of such adjustments during any single interest rate adjustment period and over the contractual term of the underlying loans.
	Capstead classifies its ARM securities based on each security’s average number of months until coupon reset (“months to roll”).  Months to roll is an indicator of asset duration which is a measure of market price sensitivity to interest rate movements.  Current-reset ARM securities have months to roll of less than 18 months while longer-to-reset ARM securities have months to roll of 18 months or greater.  As of December 31, 2013, the average months to roll for the Company’s $7.48 billion (amortized cost basis) in current-reset ARM securities was 6.1 months while the average months-to-roll for the Company’s $5.76 billion (amortized cost basis) in longer-to-reset ARM securities was 38.7 months.
	Under variable interest entity accounting rules, the Company consolidated two townhome developments that were collateral for subordinated loans made by the Company prior to the 2012 sale of all of the remaining townhome units.  Included in Miscellaneous other revenue (expense) is $44,000 of gains on unit sales, net of operating costs, recorded in 2012.  Operating costs, net of gains on unit sales, totaled $277,000 during 2011, including impairment charges of $470,000.

INVESTMENTS_IN_UNCONSOLIDATED_

INVESTMENTS IN UNCONSOLIDATED AFFILIATES	12 Months Ended
	Dec. 31, 2013
INVESTMENTS IN UNCONSOLIDATED AFFILIATES [Abstract]	'
INVESTMENTS IN UNCONSOLIDATED AFFILIATES	'
	NOTE 5 ¾ INVESTMENTS IN UNCONSOLIDATED AFFILIATES
	To facilitate the issuance of Unsecured borrowings, in 2006 and 2005 Capstead formed and capitalized three Delaware statutory trusts through the issuance to the Company of the trusts’ common securities totaling $3.1 million (see NOTE 8).  In order to simplify the Company’s capital structure, on December 16, 2013 the trusts were dissolved after distributing the related junior subordinated notes (originally issued to the trusts by the Company) to the holders of the trusts’ common and preferred securities.  Prior to dissolution, the Company’s equity in the earnings of the trusts consisted solely of the common trust securities’ pro rata share in interest accruing on junior subordinated notes issued to the trusts.

REPURCHASE_ARRANGEMENTS_AND_SI

REPURCHASE ARRANGEMENTS AND SIMILAR BORROWINGS	12 Months Ended
	Dec. 31, 2013
REPURCHASE ARRANGEMENTS AND SIMILAR BORROWINGS [Abstract]	'
REPURCHASE ARRANGEMENTS AND SIMILAR BORROWINGS	'
	NOTE 6 ¾ REPURCHASE ARRANGEMENTS AND SIMILAR BORROWINGS
	Capstead generally pledges its Residential mortgage investments as collateral under repurchase arrangements with commercial banks and other financial institutions, referred to as counterparties, the terms and conditions of which are negotiated on a transaction-by-transaction basis when each borrowing is initiated or renewed.  Repurchase arrangements entered into by the Company involve the sale and a simultaneous agreement to repurchase the transferred assets at a future date, typically with terms of 30 to 90 days, and are accounted for as financings.  The Company maintains the beneficial interest in the specific securities pledged during the term of the repurchase arrangement and receives the related principal and interest payments.  The amount borrowed is generally equal to the fair value of the assets pledged, as determined by the lending counterparty, less an agreed-upon discount, referred to as a “haircut.”  Interest rates on these borrowings are fixed based on prevailing rates corresponding to the terms of the borrowings, and interest is paid at the termination of the repurchase arrangement at which time the Company may enter into a new repurchase arrangement at prevailing market rates with the same counterparty or repay that counterparty and negotiate financing with a different counterparty.  None of the Company’s counterparties are obligated to renew or otherwise enter into new repurchase arrangements at the conclusion of existing repurchase arrangements. In response to declines in fair value of pledgedsecurities due to changes in market conditions or the publishing of monthly security pay down factors, lenders typically require the Company to post additional securities as collateral, pay down borrowings or fund cash margin accounts with the counterparties in order to re-establish the agreed-upon collateral requirements, referred to as margin calls.
	Repurchase arrangements and similar borrowings (and related pledged collateral, including accrued interest receivable), classified by collateral type and remaining maturities, and related weighted average borrowing rates as of the indicated dates were as follows (dollars in thousands):
	Collateral Type		Collateral		Accrued			Borrowings		Average
			Carrying		Interest			Outstanding		Borrowing
			Amount		Receivable					Rates
	As of December 31, 2013:
	Borrowings with maturities of 30 days or less:
	Agency Securities		$	12,169,534	$	28,195		$	11,578,211		0.38	%
	Borrowings with maturities greater than 30 days:
	Agency Securities (31 to 90 days)			951,966		2,068			902,432		0.38
	Similar borrowings:
	Collateral for structured financings*			2,257		–			2,257		8.09
			$	13,123,757	$	30,263		$	12,482,900		0.38
	Year-end borrowing rates adjusted for effects of related derivative financial instruments (“Derivatives”) held as cash flow hedges (see NOTE 7)										0.49
	As of December 31, 2012:
	Borrowings with maturities of 30 days or less:
	Agency Securities		$	13,406,253	$	32,807		$	12,739,872		0.47
	Borrowings with maturities greater than 30 days:
	Agency Securities (31 to 90 days)			44,060		51			41,520		0.57
	Similar borrowings:
	Collateral for structured financings*			2,846		–			2,846		8.12
			$	13,453,159	$	32,858		$	12,784,238		0.47
	Year-end borrowing rates adjusted for effects of related Derivatives held as cash flow hedges										0.65
		*	The maturity of structured financings is directly affected by prepayments on the related mortgage pass-through securities pledged as collateral and these financings are subject to redemption by the residual bondholders.
	Average borrowings outstanding differed from respective year-end balances during the indicated periods primarily due to changes in portfolio levels and differences in the timing of portfolio acquisitions relative to portfolio runoff as illustrated below (dollars in thousands):
			Year ended December 31
			2013					2012
			Average		Average			Average		Average
			Borrowings		Rate			Borrowings		Rate
	Average borrowings and rates for the indicated years, adjusted for the effects of related Derivatives held as cash flow hedges		$	12,702,941		0.52	%	$	12,442,706		0.56	%
	In connection with the 2011 bankruptcy of a lending counterparty, the Company received cash in lieu of the return of $8.3 million of its pledged collateral resulting in a loss of $62,000 on the effective sale of these bonds, which is included in Miscellaneous other revenue (expense) on the Statement of Income and Gain on asset sales on the Statement of Cash Flows.  The basis in the bonds effectively sold is included in Proceeds from asset sales on the Statement of Cash Flows.
	Interest paid on Repurchase arrangements and similar borrowings, including related swap agreement cash flows, totaled $71.1 million, $69.5 million and $55.2 million during 2013, 2012 and 2011, respectively.

USE_OF_DERIVATIVE_FINANCIAL_IN

USE OF DERIVATIVE FINANCIAL INSTRUMENTS, OFFSETTING DISCLOSURES AND CHANGES IN OTHER COMPREHENSIVE INCOME BY COMPONENT	12 Months Ended
	Dec. 31, 2013
USE OF DERIVATIVE FINANCIAL INSTRUMENTS, OFFSETTING DISCLOSURES AND CHANGES IN OTHER COMPREHENSIVE INCOME BY COMPONENT [Abstract]	'
USE OF DERIVATIVE FINANCIAL INSTRUMENTS, OFFSETTING DISCLOSURES AND CHANGES IN OTHER COMPREHENSIVE INCOME BY COMPONENT	'
	NOTE 7 ¾ USE OF DERIVATIVE FINANCIAL INSTRUMENTS, OFFSETTING DISCLOSURES AND CHANGES IN OTHER COMPREHENSIVE INCOME BY COMPONENT
	To help mitigate exposure to higher interest rates, Capstead typically uses currently-paying and forward-starting, one-month LIBOR-indexed, pay-fixed, receive-variable, interest rate swap agreements that require interest payments for two-year terms.  These Derivatives are designated as cash flow hedges of the variability of the underlying benchmark interest rate of current and forecasted 30- to 90-day borrowings under repurchase arrangements.  This hedge relationship establishes a relatively stable fixed rate on related borrowings because the variable-rate payments received on the swap agreements offset a significant portion of the interest accruing on the related borrowings, leaving the fixed-rate payments to be paid on the swap agreements as the Company’s effective borrowing rate, subject to certain adjustments.  These adjustments include changes in spreads between variable rates on the swap agreements and actual borrowing rates as well as the effects of measured hedge ineffectiveness.  Additionally, changes in fair value of these Derivatives tend to partially offset opposing changes in fair value of the Company’s residential mortgage investments that can occur in response to changes in market interest rates.
	During 2013 Capstead entered into new forward-starting swap agreements with notional amounts of $2.50 billion  requiring fixed rate interest payments averaging 0.50% for two-year periods that commence on various dates between January 2014 and April 2014.  Swap agreements with notional amounts totaling $2.90 billion requiring fixed rate interest payments averaging 0.85% expired during the year.  At December 31, 2013, the Company’s portfolio of financing-related swap positions had the following characteristics (dollars in thousands):
	Period of		Notional				Average Fixed Rate
	Contract Expiration		Amount				Payment Requirement
	Currently-paying contracts:
	First quarter 2014		$	200,000				0.6	%
	Second quarter 2014			400,000				0.51
	Third quarter 2014			200,000				0.51
	Fourth quarter 2014			500,000				0.58
	First quarter 2015			1,100,000				0.5
	Second quarter 2015			200,000				0.43
	Third quarter 2015			400,000				0.47
	Fourth quarter 2015			1,200,000				0.45
	(average expiration:  14 months)			4,200,000				0.5
	Forward-starting contracts:
	First quarter 2016			1,700,000				0.51
	Second quarter 2016			800,000				0.46
	(average expiration:  25 months)			2,500,000				0.5
	(average expiration:  18 months)		$	6,700,000
	In addition to portfolio financing-related swap positions, in 2010 the Company entered into three forward-starting, three-month LIBOR-indexed, pay-fixed, receive-variable, interest rate swap agreements with notional amounts totaling $100 million, average fixed rates of 4.09% that begin in 2015 and 2016, and 20-year payment terms coinciding with the floating-rate terms of the Company’s Unsecured borrowings.  These Derivatives are designated as cash flow hedges of the variability of the underlying benchmark interest rate associated with the floating-rate terms of these long-term borrowings (see NOTE 8).
	Interest rate swap agreements are measured at fair value on a recurring basis primarily using Level Two Inputs in accordance with “Fair Value Measurements and Disclosures” (“ASC 820”).  In determining fair value estimates for these Derivatives, the Company utilizes the standard methodology of netting the discounted future fixed cash payments and the discounted future variable cash receipts which are based on expected future interest rates derived from observable market interest rate curves.  The Company also incorporates both its own nonperformance risk and its counterparties’ nonperformance risk in determining the fair value of these Derivatives.  In considering the effect of nonperformance risk, the Company considered the impact of netting and credit enhancements, such as collateral postings and guarantees, and has concluded that counterparty risk is not significant to the overall valuation of these agreements.  The following tables include fair value and other related disclosures regarding all Derivatives held as of and for the indicated periods (in thousands):
		Balance Sheet		31-Dec
		Location		2013				2012
	Balance sheet-related
	Swap agreements in a gain position (an asset) related to:
	Borrowings under repurchase arrangements	(a)		$	1,094			$	169
	Unsecured borrowings	(a)			3,911				–
	Swap agreements in a loss position (a liability) related to:
	Borrowings under repurchase arrangements	(a)			(11,304	)			(18,671	)
	Unsecured borrowings	(a)			–				(14,197	)
	Related net interest payable	(b)			(5,493	)			(7,788	)
				$	(11,792	)		$	(40,487	)
		(a)	The fair value of Derivatives with realized and unrealized gains are aggregated and recorded as an asset on the face of the Balance Sheet separately from the fair value of Derivatives with realized and unrealized losses that are recorded as a liability.  The amount of unrealized losses at December 31, 2013 scheduled to be recognized in the Statement of Income over the next twelve months primarily in the form of fixed-rate swap payments in excess of current market rates totaled $14.5 million.
		(b)	Included in “Accounts payable and accrued expenses” on the face of the Balance Sheet.
			Location of					Year ended December 31
			Gain or (Loss)
			Recognized in
			Net Income					2013				2012			2011
	Income statement-related
	Components of effect on interest expense:
	Amount of loss reclassified from Accumulated other comprehensive income related to the effective portion of active positions						$	(16,914	)		$	(19,882	)	$	(28,066	)
	Amount of gain (loss) recognized (ineffective portion)							24				(542	)		(827	)
	Increase in interest expense and decrease in Net income as a result of the use of Derivatives			*			$	(16,890	)		$	(20,424	)	$	(28,893	)
	Other comprehensive income-related
	Amount of gain (loss) recognized in Other comprehensive income (loss) (effective portion)						$	9,320			$	(22,262	)	$	(51,751	)
		*	Included in “Interest expense:  Repurchase arrangements and similar borrowings” on the face of the Statement of Income.
	The Company’s swap agreements and borrowings under repurchase arrangements are subject to master netting arrangements in the event of default on, or termination of, any one contract.  See NOTE 6 for more information on the Company’s use of repurchase arrangements.  The following tables provide disclosures concerning offsetting of financial liabilities and Derivatives as of the indicated dates (in thousands):
			Offsetting of Derivative Assets
			Gross				Gross				Net Amounts			Gross Amounts Not Offset
							Amounts				of Assets			in the Balance Sheet(a)
			Amounts of				Offset in				Presented in			Financial			Cash			Net
			Recognized				the Balance				the Balance			Instruments			Collateral			Amount
			Assets				Sheet				Sheet						Received
	As of December 31, 2013:
	Counterparty 1		$	4,324			$	–			$	4,324		$	(4,324	)	$	–		$	–
	Counterparty 2			681				–				681			(681	)		–			–
			$	5,005			$	–			$	5,005		$	(5,005	)	$	–		$	–
	As of December 31, 2012:
	Counterparty 1		$	128			$	–			$	128		$	(128	)	$	–		$	–
	Counterparty 2			41				–				41			(41	)		–			–
			$	169			$	–			$	169		$	(169	)	$	–		$	–
			Offsetting of Financial Liabilities and Derivative Liabilities
		Gross				Gross				Net Amounts			Gross Amounts Not Offset
						Amounts				of Liabilities			in the Balance Sheet (c)
		Amounts of				Offset in				Presented in			Financial			Cash			Net
		Recognized				the Balance				the Balance			Instruments			Collateral			Amount
		Liabilities(b)				Sheet				Sheet (a)						Pledged
As of December 31, 2013:
Derivatives by counterparty:
Counterparty 1		$	7,628			$	–			$	7,628		$	(4,324	)	$	(3,304	)	$	–
Counterparty 2			7,588				–				7,588			(681	)		(6,907	)		–
Counterparty 3			1,581				–				1,581			–			(1,581	)		–
			16,797				–				16,797			(5,005	)		(11,792	)		–
Repurchase arrangements and similar borrowings			12,487,604				–				12,487,604			(12,487,604	)		–			–
		$	12,504,401			$	–			$	12,504,401		$	(12,492,609	)	$	(11,792	)	$	–
As of December 31, 2012:
Derivatives by counterparty:
Counterparty 1		$	26,904			$	–			$	26,904		$	(128	)	$	(26,776	)	$	–
Counterparty 2			12,357				–				12,357			(41	)		(11,500	)		816
Counterparty 3			1,395				–				1,395			–			(1,395	)		–
			40,656				–				40,656			(169	)		(39,671	)		816
Repurchase arrangements and similar borrowings			12,791,243				–				12,791,243			(12,791,243	)		–			–
		$	12,831,899			$	–			$	12,831,899		$	(12,791,412	)	$	(39,671	)	$	816
(a)	Amounts presented are limited to recognized liabilities and cash collateral received associated with the indicated counterparty sufficient to reduce the related Net Amount to zero in accordance with ASU No. 2011-11, as amended by ASU No. 2013-01.
(b)	Amounts include accrued interest of $5.5 million and $7.8 million on interest rate swap agreements and $4.7 million and $7.0 million on repurchase arrangements and similar borrowings, included in “Accounts payable and accrued expenses” on the face of the Balance Sheets as of December 31, 2013 and December 31, 2012, respectively.
(c)	Amounts presented are limited to recognized assets and collateral pledged associated with the indicated counterparty sufficient to reduce the related Net Amount to zero in accordance with ASU No. 2011-11, as amended by ASU No. 2013-01.
Changes in Accumulated other comprehensive income by component for the three years ended December 31, 2013 were as follows (in thousands):
		Gains and Losses on Cash Flow Hedges				Unrealized Gains and Losses on Available-for-Sale Securities				Total
Balance at December 31, 2010		$	(6,474	)		$	180,374			$	173,900
Activity for the year ended December 31, 2011:
Other comprehensive income (loss) before reclassifications			(51,751	)			54,263				2,512
Amounts reclassified from accumulated other comprehensive income			28,066				62				28,128
Other comprehensive income (loss)			(23,685	)			54,325				30,640
Balance at December 31, 2011			(30,159	)			234,699				204,540
Activity for the year ended December 31, 2012:
Other comprehensive income (loss) before reclassifications			(22,262	)			91,750				69,488
Amounts reclassified from accumulated other comprehensive income			19,882				–				19,882
Other comprehensive income (loss)			(2,380	)			91,750				89,370
Balance at December 31, 2012			(32,539	)			326,449				293,910
Activity for the year ended December 31, 2013:
Other comprehensive income (loss) before reclassifications			9,320				(101,001	)			(91,681	)
Amounts reclassified from accumulated other comprehensive income			16,914				–				16,914
Other comprehensive income (loss)			26,234				(101,001	)			(74,767	)
Balance at December 31, 2013		$	(6,305	)		$	225,448			$	219,143

UNSECURED_BORROWINGS

UNSECURED BORROWINGS	12 Months Ended
	Dec. 31, 2013
UNSECURED BORROWINGS [Abstract]	'
UNSECURED BORROWINGS	'
	NOTE 8 ¾ UNSECURED BORROWINGS
	Unsecured borrowings consist of 30-year junior subordinated notes originally issued in 2006 and 2005 to three special-purpose statutory trusts formed to issue $3.1 million of the trusts’ common securities to Capstead and to privately place $100 million of so-called trust preferred securities with unrelated third party investors.  On December 16, 2013 these trusts were dissolved after the subordinated notes were distributed to the holders of the trusts’ common and preferred securities.  Included in Receivables and other assets are $2.2 million in remaining issue costs at December 31, 2013 associated with the original issuance of these notes.
	Note balances and related weighted average interest rates as of the indicated dates  (calculated including issue cost amortization) were as follows (dollars in thousands):
			31-Dec-13					31-Dec-12
			Borrowings		Average			Borrowings		Average
			Outstanding		Rate *			Outstanding		Rate *
	Junior subordinated notes associated with:
	Capstead Mortgage Trust I		$	35,000		8.31	%	$	36,083		8.31	%
	Capstead Mortgage Trust II			40,000		8.46			41,238		8.46
	Capstead Mortgage Trust III			25,000		8.78			25,774		8.78
			$	100,000		8.49		$	103,095		8.49
		*	The indicated weighted average rates have been in effect since issuance.  After considering cash flow hedges that coincide with the floating rate terms of these borrowings that begin in October and December 2015 for the notes associated with Capstead Mortgage Trusts I and II and September 2016 for the notes associated with Capstead Mortgage Trust III, the effective borrowing rate during the final 20 years of these borrowings will average 7.56%, subject to certain adjustments for the effects of measured hedge ineffectiveness, if any.
	The notes associated with Capstead Mortgage Trust I mature in October 2035 and are currently redeemable, in whole or in part, without penalty, at the Company’s option.  The notes associated with Capstead Mortgage Trust II mature in December 2035 and are redeemable, in whole or in part, without penalty, at the Company’s option anytime on or after December 15, 2015.  The notes associated with Capstead Mortgage Trust III mature in September 2036 and are redeemable, in whole or in part, without penalty, at the Company’s option anytime on or after September 15, 2016.
	Since issuance, the weighted average effective interest rate for Unsecured borrowings (calculated including issue cost amortization) was 8.49% and related interest paid each full year the borrowings have been outstanding was $8.6 million.

DISCLOSURES_REGARDING_FAIR_VAL

DISCLOSURES REGARDING FAIR VALUES OF FINANCIAL INSTRUMENTS	12 Months Ended
	Dec. 31, 2013
DISCLOSURES REGARDING FAIR VALUES OF FINANCIAL INSTRUMENTS [Abstract]	'
DISCLOSURES REGARDING FAIR VALUES OF FINANCIAL INSTRUMENTS	'
	NOTE 9 ¾ DISCLOSURES REGARDING FAIR VALUES OF FINANCIAL INSTRUMENTS
	This note provides fair value disclosures as of the indicated balance sheet dates, all of which are determined using Level 2 Inputs in accordance with ASC 820, for Capstead’s financial assets and liabilities, most of which are influenced by changes in, and market expectations for changes in, interest rates and market liquidity conditions, as well as other factors beyond the control of management.
	Residential mortgage investments, nearly all of which are mortgage securities classified as available-for-sale, are measured at fair value on a recurring basis.  In determining fair value estimates for mortgage securities, the Company considers recent trading activity for similar investments and pricing levels indicated by lenders in connection with designating collateral for repurchase arrangements, provided such pricing levels are considered indicative of actual market clearing transactions.  In determining fair value estimates for longer-term borrowings under repurchase arrangements the Company considers pricing levels indicated by lenders for entering into new transactions using similar pledged collateral with terms equal to the remaining terms of the longer-term borrowings.  In determining fair value estimates for unsecured borrowings, the Company considers current pricing for financial instruments with similar characteristics.  Excluded from these disclosures are financial instruments for which the Company’s cost basis is deemed to approximate fair value due primarily to the short duration of these instruments, which are valued using primarily Level 1 measurements, including Cash and cash equivalents, cash collateral receivable from, or payable to, interest rate swap counterparties, receivables, payables and borrowings under repurchase arrangements with initial terms of 120 days or less.  See NOTE 7 for information relative to the valuation of interest rate swap agreements.
	Fair value disclosures for financial instruments other than debt securities were as follows as of the indicated dates (in thousands):
		31-Dec-13				31-Dec-12
		Carrying		Fair		Carrying		Fair
		Amount		Value		Amount		Value
	Financial assets:
	Residential mortgage loans	$	6,898	$	7,000	$	8,063	$	8,200
	Interest rate swap agreements		5,005		5,005		169		169
	Financial liabilities:
	Repurchase arrangements with initial terms of greater than 120 days		36,299		36,300		41,520		41,500
	Unsecured borrowings		100,000		101,000		103,095		104,600
	Interest rate swap agreements		11,304		11,304		32,868		32,868
	Fair value and related disclosures for debt securities were as follows as of the indicated dates (in thousands):
		Amortized		Gross Unrealized
		Cost Basis		Gains		Losses		Fair Value
	As of December 31, 2013
	Agency Securities classified as available-for-sale:
	Fannie Mae/Freddie Mac	$	11,019,116	$	224,456	$	12,468	$	11,231,104
	Ginnie Mae		2,220,035		18,384		4,924		2,233,495
	Residential mortgage securities classified as held-to-maturity		4,376		211		–		4,587
	As of December 31, 2012
	Agency Securities classified as available-for-sale:
	Fannie Mae/Freddie Mac		11,904,660		296,114		1,787		12,198,987
	Ginnie Mae		1,614,997		32,298		176		1,647,119
	Residential mortgage securities classified as held-to-maturity		5,989		309		–		6,298
		31-Dec-13				31-Dec-12
		Fair		Unrealized		Fair		Unrealized
		Value		Loss		Value		Loss
	Securities in an unrealized loss position:
	One year or greater	$	39,030	$	380	$	29,760	$	120
	Less than one year		2,857,724		17,012		751,645		1,843
		$	2,896,754	$	17,392	$	781,405	$	1,963
	Capstead’s investment strategy involves managing a leveraged portfolio of primarily relatively short duration ARM Agency Securities and management expects these securities will be held until payoff absent a major shift in strategy.  Declines in fair value caused by increases in interest rates are typically modest for investments in relatively short duration ARM Agency Securities compared to investments in longer-duration ARM or fixed-rate assets.  These declines are generally recoverable in a relatively short period of time as coupon interest rates on the underlying mortgage loans reset to rates more reflective of the then current interest rate environment.
	From a credit risk perspective, federal government support for the GSEs helps ensure that fluctuations in value due to credit risk associated with these securities will be limited.  Given that (a) any existing unrealized losses on mortgage securities held by the Company are not attributable to credit risk, (b) the Company typically holds its investments to maturity, and (c) it is more likely than not that the Company will not be required to sell any of its investments, none of these investments are considered other-than-temporarily impaired at December 31, 2013.

INCOME_TAXES

INCOME TAXES	12 Months Ended
	Dec. 31, 2013
INCOME TAXES [Abstract]	'
INCOME TAXES	'
	NOTE 10 ¾ INCOME TAXES
	Capstead REIT and a subsidiary for which the Company has elected taxable REIT subsidiary status file separate tax returns in U.S. federal and state jurisdictions, where applicable.  Provided Capstead REIT remains qualified as a REIT and all its taxable income is distributed to stockholders within allowable time limits, no income taxes are due on this income.  Accordingly, no provision has been made for income taxes for Capstead REIT.  Taxable income, if any, of the Company’s taxable REIT subsidiary is fully taxable and provision is made for any resulting income taxes.  The Company is no longer subject to examination and the related assessment of tax by federal, state, or local tax authorities for years before 2010, with the possible exception of certain information reporting and disclosure penalties with respect to earlier years.  Management believes any such amounts would not have a material adverse effect on the Company’s financial condition.
	Capstead’s effective tax rate differs substantially from statutory federal income tax rates primarily due to the benefit of Capstead REIT’s status as a REIT, along with other items affecting the Company’s effective tax rate as illustrated below for the indicated periods (in thousands):
			Year ended December 31
			2013			2012			2011
	Income taxes computed at the federal statutory rate		$	44,270		$	57,269		$	37,171
	Benefit of REIT status			(44,270	)		(57,268	)		(37,183	)
	Income taxes computed on income of Capstead’s sole taxable REIT subsidiary			–			1			(12	)
	Change in net deferred income tax assets			1			(1	)		22
	Other			(1	)		–			(10	)
	Income tax provision		$	–		$	–		$	–
	No income taxes were paid during 2013, 2012 or 2011.  Significant components of the Company’s taxable REIT subsidiary’s deferred income tax assets and liabilities were as follows as of the indicated dates (in thousands):
			31-Dec
			2013			2012
	Deferred income tax assets:
	Alternative minimum tax credit (a)		$	1,942		$	1,940
	Net operating loss carryforwards (b)			60			60
	Other			21			22
				2,023			2,022
	Deferred income tax liabilities			–			–
	Net deferred tax assets		$	2,023		$	2,022
	Valuation allowance (c)		$	2,023		$	2,022
		(a)	Alternative tax credit carryforwards can be utilized to offset payment of federal income taxes on future taxable income, if any, earned by this subsidiary, subject to certain limitations.
		(b)	Excludes $3.5 million in remaining net operating loss carryforwards which expire beginning after 2019.  To the extent these carryforwards are utilized in future periods, the benefit will reduce actual taxes payable.
		(c)	Because this subsidiary is not expected to earn significant amounts of taxable income, related net deferred tax assets are fully reserved at December 31, 2013.

STOCKHOLDERS_EQUITY

STOCKHOLDERS' EQUITY	12 Months Ended
	Dec. 31, 2013
STOCKHOLDERS EQUITY [Abstract]	'
STOCKHOLDERS' EQUITY	'
	NOTE 11 ¾ STOCKHOLDERS’ EQUITY
	In May 2013 Capstead completed a public offering of 6.8 million shares ($170.0 million face amount) of its 7.50% Series E Cumulative Redeemable Preferred Stock, liquidation preference $25.00 per share.  The Series E preferred shares are redeemable at the Company’s option for $25.00 per share, plus any accumulated and unpaid dividends, on or after May 13, 2018.  The Company and Series E stockholders have special redemption and conversion rights upon the occurrence of a change in control.  Net proceeds of the offering, after underwriting fees and other costs, totaled $164.3 million and together with $42.7 million of cash on hand were used to fund the June 2013 redemption of 77,000 and 16.5 million of the Company’s Series A and B perpetual preferred shares, respectively.  Holders of the remaining 109,000 Series A and 32,000 Series B shares that were outstanding prior to the redemptions exercised conversion rights resulting in the issuance of 181,000 and 20,000 common shares, respectively.  Series A and B preferred shares that were redeemed had redemption preferences aggregating $207.0 million, a total of $19.9 million in excess of these shares’ recorded amounts on the Company’s balance sheet.  This redemption preference premium is reflected as a $0.21 per common share reduction in net income available to common stockholders on the face of the Company’s Statement of Income for the year ended December 31, 2013.
	In late 2013 the Company issued an additional 61,000 Series E preferred shares through an at-the-market continuous offering program for net proceeds of $1.4 million, net of expenses.  During 2012 and 2011, the Company raised $142.0 million and $231.7 million in new common equity capital, after underwriting discounts and offering expenses, by issuing 10.5 million and 17.8 million common shares, respectively, through a similar program.  Also during 2012 and 2011, the Company raised $4.5 million and $5.2 million, net of expenses, in preferred equity capital by issuing 309,000 and 365,000 Series B preferred shares, respectively, through a similar program.
	In October 2012 the Company announced a common share repurchase program of up to $100 million of its outstanding common shares and suspended its common equity continuous offering program until further notice.  Pursuant to this authorization, repurchases totaled 3.0 million shares at an average cost of $11.80 per share for $35.1 million by December 31, 2012.  An additional 638,000 shares were repurchased in early January 2013 at an average cost of $11.43 per share for a total cost of $7.3 million.  The authorization does not obligate the Company to acquire any particular amount of common shares and the program may be suspended or discontinued at the Company’s discretion without prior notice.  Upon suspension of the repurchase program, issuances of common shares under the continuous offering program or by any other means may resume if conditions warrant, subject to compliance with federal securities laws, market conditions and blackout periods associated with the dissemination of earnings and dividend announcements and other important Company-specific news.
	During 2013, 2012 and 2011, additions to common equity capital related to equity-based awards to directors and employees totaled $1.8 million, $4.4 million and $3.2 million, respectively, consisting primarily of amounts related to stock awards and also including net proceeds from the exercise of option awards.  See NOTE 12 for further information pertaining to long-term equity-based awards.
	Capstead’s charter provides that if its board of directors determines in good faith that the direct or indirect ownership of the common shares has become concentrated to an extent which would cause Capstead REIT to fail to qualify as a REIT, the Company may redeem or repurchase, at fair market value, any number of common or preferred shares sufficient to maintain or bring such ownership into conformity with the Code.  In addition, the Company may refuse to transfer or issue common or preferred shares to any person whose ownership of the shares would result in Capstead REIT being unable to comply with the requirements of the Code.  Finally, the charter provides that the Company may redeem or refuse to transfer any of its shares to prevent the imposition of a penalty tax as a result of ownership of such shares by certain disqualified organizations, including governmental bodies and tax-exempt entities that are not subject to tax on unrelated business taxable income.

COMPENSATION_PROGRAMS

COMPENSATION PROGRAMS	12 Months Ended
	Dec. 31, 2013
COMPENSATION PROGRAMS [Abstract]	'
COMPENSATION PROGRAMS	'
	NOTE 12 ¾ COMPENSATION PROGRAMS
	The compensation committee of Capstead’s board of directors (the “Committee”) administers all compensation programs for employees including salaries, short-term incentive compensation and long-term incentive compensation, including equity-based awards, as well as other benefit programs.
	Short-Term Incentive Compensation Programs
	To provide employees with an appropriate performance-based annual incentive compensation opportunity, each year the Committee approves an incentive formula for the award of annual incentive compensation that is directly linked with the performance of the Company.  The formula used in recent years accomplished this by establishing an incentive pool equal to a percentage participation in Capstead’s earnings in excess of a pre-established performance threshold, subject to a maximum amount, or cap.  The Committee determined (i) the amount actually awarded, (ii) its allocation among executives and with other employees and (iii) the form of payment (e.g., cash or equity awards).  In October 2013 the Committee terminated this absolute return program effective July 1, 2013 and adopted a new short-term incentive compensation program for key executives (the “2013 Program”).  The 2013 Program determined levels of annual cash incentive compensation based on relative performance metrics measured against the Company’s peers in the mortgage REIT industry and the attainment of individual goals and objectives for participating executives.  The relative performance metrics used are relative economic return (change in book value plus dividends) and relative operating efficiency (operating expenses divided by Unsecured borrowings and Stockholders’ equity), calculated for the full year and prorated for the six month period during which the program was effective in 2013.  The 2013 Program defined maximum payout percentages based on a multiple of salary for each program metric thereby limiting the amount payable to each participating executive.  Actual amounts to be awarded are based on separate calculations for each performance metric as well as the Committee’s evaluation of the participating executives’ attainment of individual goals and objectives.  In January 2014 the Committee adopted the 2014 short-term incentive program that has provisions similar to the 2013 Program with the addition of an absolute economic return performance metric which measures performance against established return levels.
	Included in Accounts payable and accrued expenses at December 31, 2013 are short-term incentive compensation accruals totaling $2.8 million, $350,000 of which was paid in January 2014 to employees not participating in the 2013 Program.  Payouts for executives participating in the 2013 Program are expected to be made by March 15, 2014 after the Company’s performance relative to its peers is determined.  In 2012 and 2011 the Committee paid incentive compensation partially in cash and partially in fully vested common stock.  The fully vested stock awards totaled 156,251 and 189,283 shares (before the surrender of shares for the payment of tax withholding requirements) valued at $11.47 and $12.60 per share when issued in December and January 2012, respectively.
	Since 2008 the Committee has utilized a performance-based cash incentive compensation program for key executives that provides for payments equal to per share dividends declared on Capstead’s common stock multiplied by a notional amount of non-vesting or “phantom” common shares (“Dividend Equivalent Rights” or “DERs”).  DERs are not attached to any stock or option awards and only represent the right to receive the same cash distributions that the Company’s common stockholders are entitled to receive during the term of the grants, subject to certain conditions, including continuous service.  All grants expire July 1, 2015.  No additional DERs were awarded in 2013.
	DERs issued and outstanding at December 31, 2013 and related compensation costs for the indicated periods were as follows:
			Total DERs			Year ended December 31
	Grant Date		Granted			2013		2012		2011
	Jul-08			225,000		$	279,000	$	335,000	$	396,000
	Jul-09			225,000			279,000		335,000		396,000
	Jul-10			60,000			75,000		89,000		105,000
	Aug-11			72,000			89,000		107,000		63,000
	Jul-12			72,000			89,000		48,000		–
				654,000		$	811,000	$	914,000	$	960,000
	Long-term Equity-based Awards
	Capstead sponsors equity-based award plans to provide for the issuance of stock awards, restricted stock unit awards, option awards and other long-term equity-based awards to directors and employees.  As of December 31, 2013, the Company has issued awards reserving for potential future issuance nearly all available shares under its existing plans.  A new plan is being submitted for stockholder approval at this year’s annual meeting of stockholders scheduled for May 28, 2014 to allow for the granting of future long-term equity-based awards.
	In December 2013 the Committee adopted a new long-term incentive program, and granted key executives a total of 242,505 performance-based restricted stock units with a grant date fair value of $12.45 per unit, which are convertible into common shares following a three-year performance period ending December 31, 2016 depending upon whether, and to what extent, defined performance levels established for certain relative and absolute return performance metrics are met or exceeded.  The relative return metrics measure the Company’s performance against its peers in the mortgage REIT industry on the basis of relative economic return and relative total stockholder return (change in stock price plus reinvested dividends).  The absolute economic return metric measures performance against established return levels.  For conversion purposes, each performance metric is assigned a weighting and the Company’s performance relative to each metric is calculated separately.  The actual number of common shares, if any, the units can convert into for each of the metrics can range from one-half of a common share per unit if that metric’s minimum threshold of performance is met, to two common shares per unit if the related maximum performance threshold is met or exceeded, adjusted for the weighting assigned to the metric.  If a metric’s minimum performance threshold is not met, no shares are issuable under that metric.  Dividends accrue from the date of grant and will be paid in cash when the units convert into common shares based on the number of common shares ultimately issued, if any.
	Under the prior absolute return performance-based stock award program, the Committee granted awards from 2008 through 2012 to all employees with staggered three-year vesting periods subject to Capstead generating annualized returns on investment capital, (defined for this purpose as Unsecured borrowings and Stockholders’ equity, less accumulated OCI and subject to certain other adjustments), equal to the greater of 8.0% or the average 10-year U.S. Treasury rate plus 200 basis points.  If the indicated returns are not generated during a three-year measurement period, vesting will be deferred and a new three-year measurement period will be established to include the subsequent year, up to and including the seventh calendar year after the year of grant.  Any remaining unvested awards issued under this program will expire if the indicated returns are not generated for the final three-year measurement period.
	Information pertaining to absolute return performance-based stock awards issued to employees pursuant to this program is as follows:
	Year of		Grant Date			Total				Final		Remaining Shares with
			Fair Value			Original				Measurement		Initial Measurement Periods
										Period Ends		Ending December 31
	Grant		Per Share			Grants		Forfeited		31-Dec		2014		2015		2016
	2008 (a)		$	10.18			140,658		5,464		n/a		–		–		–
	2009 (b)			14.33			110,917		4,571		n/a		–		–		–
	2010 (c)			12.44			128,766		5,759		2017		61,499		–		–
	2011			12.72			132,490		5,050		2018		63,722		63,718		–
	2012			11.67			145,399		5,697		2019		–		69,853		69,849
		(a)	The absolute return metrics for the three-year measurement periods ending December 31, 2012 and 2011 were met resulting in the vesting of 67,595 shares associated with the second 50% of this grant in January 2013 and 67,599 shares associated with the first 50% of this grant in February 2012.
		(b)	The absolute return metrics for the three-year measurement periods ending December 31, 2013 and 2012 were met resulting in the vesting of 52,915 shares associated with the second 50% of this grant in January 2014 and 53,431 shares associated with the first 50% of this grant in January 2013.
		(c)	The absolute return metric for the first three-year measurement period ending December 31, 2013 was met resulting in the vesting of 61,508 shares associated with the first 50% of this grant in January 2014.
	Information pertaining to service-based stock awards issued to directors and employees (subject to certain restrictions, principally continuous service), is as follows:
	Year of		Grant Date			Total		As of December 31, 2013				Remaining Shares
			Fair Value			Original						Scheduled to Vest During:
	Grant		Per Share			Grants		Vested		Forfeited		2014		2017
	2007 (a)		$	12.93			156,000		121,004		12,832		22,164		–
	2008 (b)			12.87			6,000		6,000		–		–		–
	2009 (b)			11.39			6,000		6,000		–		–		–
	2010 (b)			11.64			12,000		12,000		–		–		–
	2011 (b)			13.23			24,000		24,000		–		–		–
	2012 (b)			13.59			29,000		29,000		–		–		–
	2013 (b)			13.02			28,000		–		–		28,000		–
	2013 (c)			12.34			35,703		–		–		–		35,703
		(a)	The remaining 2007 grant shares vested in January 2014.
		(b)	Director stock awards have been granted annually upon election or reelection to the board of directors.  These awards vest one year after issuance.
		(c)	In December 2013 the Committee granted service-based awards to employees that were not awarded performance-based restricted stock units.  These awards vest on January 2, 2017.
	Performance-based and service-based stock award activity for year ended December 31, 2013 is summarized below:
			Number of			Weighted Average
			Shares			Grant Date
						Fair Value
	Unvested stock awards outstanding at beginning year			657,720		$	12.48
	Grants			63,703			12.64
	Vestings			(172,523	)		12.41
	Forfeitures			(19,969	)		12.65
	Unvested stock awards outstanding at end of year			528,931			12.51
	During 2013, 2012 and 2011 Capstead recognized in Salaries and benefits $1.8 million, $1.9 million and $1.6 million, respectively, related to amortization of the grant date fair value of employee performance-based and service-based stock awards.  The amounts amortized for these periods assumed that performance metrics, if applicable, would continue to be met for related initial measurement periods.  In addition, the Company recognized in Other general and administrative expense $387,000, $362,000 and $261,000 related to amortization of the grant date fair value of service-based director stock awards during 2013, 2012 and 2011, respectively. Unrecognized compensation expense for unvested stock awards totaled $3.0 million as of December 31, 2013, to be expensed over a weighted average period of 1.6 years (assumes minimal employee and director attrition and, if applicable, absolute return performance metrics being met for related initial measurement periods).
	Based on the initial fair value of restricted stock units granted in December 2013, $3.0 million can be expected to be expensed over the related three-year performance period under the assumption certain targeted performance levels will be achieved assuming no forfeitures.  This would result in the issuance of 242,505 common shares.  Actual expense assuming no forfeitures will range from a minimum of $625,000 (the grant date fair value of the total stockholder return performance metric and assuming no shares are ultimately issued under the terms of these grants because the Company’s performance for all performance metrics was less than the related minimum threshold performance levels) to approximately $5.4 million assuming maximum performance levels are met or exceeded for all performance metrics resulting in the issuance of 485,010 common shares.
	All service-based stock awards receive dividends on a current basis without risk of forfeiture if the related awards do not vest.  Restricted stock units granted in 2013 as well as performance-based stock awards granted in 2012, 2011 and 2010 defer the payment of dividends accruing between the grant dates and the end of related performance periods.  If the restricted stock units do not convert into any common shares or a stock award does not vest, the related accrued dividends will be forfeited.  Included in Common stock dividend payable at December 31, 2013 and 2012 are dividends payable pertaining to these awards totaling $1.3 million and $765,000, respectively.
	Option awards currently outstanding have ten-year contractual terms from the grant date and were issued with strike prices equal to the quoted market prices of Capstead’s common shares on the date of grant.  The fair value of option awards was estimated on the date of grant using a Black-Scholes option pricing model.  The Company estimated option exercises, expected holding periods and forfeitures based on past experience and expectations for option performance and employee or director attrition.  Risk-free rates were based on market rates for the expected life of the options.  Expected dividends were based on historical experience and expectations for future performance.  Expected volatility factors were based on historical experience.  No option awards have been granted since 2010.  Option award activity for the year ended December 31, 2013 is summarized below:
			Number of			Weighted Average
			Shares			Exercise Price
	Option awards outstanding at beginning of year			97,500		$	11.63
Exercises			(15,000	)		10.61
Forfeitures			(5,000	)		12.87
Option awards outstanding at end of year			77,500			11.75
Exercisable option awards outstanding as of December 31, 2013 totaled 77,500 shares with a weighted average remaining contractual term of 3.6 years, an average exercise price of $11.75 and an aggregate intrinsic value of $65,000.  The total intrinsic value of option awards exercised was $26,000, $620,000 and $129,000 in 2013, 2012 and 2011, respectively.  During 2011, the Company recognized in Salaries and benefits $3,000 related to employee option awards.
Other Benefit Programs
Capstead sponsors a qualified defined contribution retirement plan for all employees and a nonqualified deferred compensation plan for certain of its officers.  In general the Company matches up to 50% of a participant’s voluntary contribution up to a maximum of 6% of a participant’s salary and short-term incentive compensation and makes discretionary contributions of up to another 3% of such compensation regardless of participation in the plans.  Company contributions are subject to certain vesting requirements.  During the year ended December 31, 2013, the Company recognized in Salaries and benefits $320,000 related to contributions to these plans.

QUARTERLY_RESULTS_UNAUDITED

QUARTERLY RESULTS (UNAUDITED)	12 Months Ended
	Dec. 31, 2013
QUARTERLY RESULTS (UNAUDITED) [Abstract]	'
QUARTERLY RESULTS	'
	NOTE 13 ¾ QUARTERLY RESULTS (UNAUDITED)
	Summarized quarterly results of operations were as follows (in thousands, except per share amounts).
			First Quarter			Second Quarter			Third Quarter			Fourth Quarter
	Year Ended December 31, 2013
	Interest income on residential mortgage investments (before investment premium amortization)		$	86,867		$	85,214		$	85,674		$	83,254
	Investment premium amortization			(28,399	)		(33,642	)		(39,031	)		(24,800	)
	Related interest expense			(18,468	)		(16,749	)		(15,759	)		(15,392	)
				40,000			34,823			30,884			43,062
	Other interest income (expense) (a)			(2,010	)		(2,015	)		(2,074	)		(2,066	)
	Other revenue (expense)			(3,072	)		(2,914	)		(4,108	)		(4,023	)
	Net income		$	34,918		$	29,894		$	24,702		$	36,973
	Basic net income per common share (b)		$	0.31		$	0.04		$	0.23		$	0.35
	Diluted net income per common share (b)			0.31			0.04			0.23			0.35
	Year Ended December 31, 2012
	Interest income on residential mortgage investments (before investment premium amortization)		$	84,229		$	87,486		$	90,614		$	90,279
	Investment premium amortization			(18,496	)		(21,699	)		(27,151	)		(29,331	)
	Related interest expense			(14,103	)		(16,451	)		(17,875	)		(20,672	)
				51,630			49,336			45,588			40,276
	Other interest income (expense) (a)			(1,972	)		(1,946	)		(1,968	)		(1,904	)
	Other revenue (expense)			(4,488	)		(4,055	)		(3,583	)		(3,288	)
	Net income		$	45,170		$	43,335		$	40,037		$	35,084
	Basic net income per common share		$	0.45		$	0.4		$	0.35		$	0.31
	Diluted net income per common share			0.44			0.4			0.35			0.31
	(a)	Consists principally of interest on unsecured borrowings and is presented net of earnings of related statutory trusts.  These affiliates were dissolved in December 2013.
	(b)	Includes $0.23 associated with redemption preference premiums paid and other one-time effects of the second quarter’s preferred capital transactions.

ACCOUNTING_POLICIES_Policies

ACCOUNTING POLICIES (Policies)	12 Months Ended
	Dec. 31, 2013
ACCOUNTING POLICIES [Abstract]	'
Basis of Presentation	'
	Basis of Presentation
	The consolidated financial statements include the accounts of Capstead Mortgage Corporation and its wholly-owned and majority-owned subsidiaries over which it exercises control.  Capstead also consolidates, if appropriate, any variable interest entities in which it holds an interest.  Common securities held by the Company in statutory trusts organized to issue long-term unsecured borrowings (prior to the dissolution of these trusts in December 2013 – see NOTE 5) were not considered variable interests at risk pursuant to variable interest entity accounting principles and were accounted for as investments in unconsolidated affiliates.  Investments in any unconsolidated affiliates are initially recorded at cost and subsequently adjusted for the Company’s equity in earnings and losses and cash contributions and distributions.  Intercompany balances and transactions have been eliminated.  Prior year amounts included in financing activities in the Statement of Cash Flows pertaining to capital stock transactions have been reclassified to conform to the current year presentation.  Additionally, prior year compensation costs related to dividend equivalent rights (see NOTE 12) have been reclassified from Salaries and benefits to Short-term incentive compensation in the Statement of Income.
Recent Accounting Developments	'
	Recent Accounting Developments
	In December 2011 the Financial Accounting Standards Board (“FASB”) issued ASU No. 2011-11, Disclosures about Offsetting Assets and Liabilities.  In January 2013, the FASB issued ASU No. 2013-01, Clarifying the Scope of Disclosures about Offsetting Assets and Liabilities.  The Company adopted the requirements of ASU No. 2011-11 as amended by ASU No. 2013-01 with its first quarterly filing in 2013.
	In February 2013 the FASB issued Accounting Standards Update (“ASU”) No. 2013-02, Comprehensive Income (Topic 220):  Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income that amended ASU No. 2011-12 and ASU No. 2011-05.  The Company adopted the requirements of ASU No. 2013-02 with its first quarterly filing in 2013.
	The provisions of these ASUs are all disclosure-related and as such, their adoption by the Company had no effect on its results of operations, financial condition, or cash flows.
Use of Estimates	'
	Use of Estimates
	The use of estimates is inherent in the preparation of financial statements.  Amortization of investment premiums on financial assets is based on estimates of future mortgage prepayments, which are impacted by future changes in interest rates and other factors.  Actual results could differ from those estimates, which could adversely affect earnings.  Fair values of financial instruments are estimated using available market information and appropriate valuation methodologies; however, considerable judgment is required in interpreting market data to develop these estimates.  Fair values fluctuate on a daily basis and are influenced by changes in, and market expectations for changes in, interest rates, market liquidity conditions and levels of mortgage prepayments, as well as other factors.  Accordingly, estimates of fair value are as of the balance sheet dates and are not necessarily indicative of the amounts that could be realized in a current market exchange.  The use of different market assumptions and estimation methodologies may have a material effect on estimated fair values.  Considerable judgment is also exercised in making impairment conclusions and estimating impairment charges.
Cash and Cash Equivalents	'
	Cash and Cash Equivalents
	Cash and cash equivalents include unrestricted cash on hand and highly liquid investments with original maturities of three months or less when purchased.
Financial Assets	'
	Financial Assets
	Most of Capstead’s financial assets are mortgage securities classified as available-for-sale and carried at fair value with unrealized gains and losses reported as a separate component of Accumulated other comprehensive income.  Loans classified as held for investment or mortgage securities classified as held-to-maturity are carried at amortized cost (unpaid principal balance, adjusted for unamortized investment premiums and discounts).  Interest is recorded as income when earned.  Investment premiums and discounts are recognized as adjustments to interest income by the interest method, generally over the expected life of the related financial assets. Realized gains and losses from sales are recorded as a component of Miscellaneous other revenue (expense).  The specific identification method is used to determine the cost of financial assets sold.  Financial assets are reviewed for potential impairment at each balance sheet date.  Other-than-temporary impairments of investments in mortgage securities can occur with adverse changes in the financial condition of the issuer and changes in the Company’s intent or ability to hold the security until any declines in fair value are recovered.  The amount of any such other-than-temporary impairment for an investment in a mortgage security is measured by comparing the recorded amount of the security to its fair value.  Impairment charges are recorded as a component of Miscellaneous other revenue (expense).
Borrowings	'
	Borrowings
	Borrowings are carried at amortized cost (unpaid principal balances, net of unamortized discounts and premiums, when present).  Discounts and premiums, as well as debt issue costs, which are recorded in Receivables and other assets, are recognized as adjustments to interest expense by the interest method over the term of the related borrowings.  Borrowings under repurchase arrangements create exposure to the potential for failure on the part of counterparties to honor their commitment to return pledged collateral.  In the event of a default by a counterparty, the Company may have difficulty recovering its collateral.  To mitigate this risk, the Company monitors the creditworthiness of its counterparties and manages its exposure to any single counterparty.
Derivative Financial Instruments ("Derivatives")	'
	Derivative Financial Instruments (“Derivatives”)
	Derivatives used by Capstead for risk management purposes are carried at fair value as assets or liabilities.  The accounting for changes in fair value of each Derivative held depends on whether it has been designated as a hedge for accounting purposes, as well as the type of hedging relationship identified.  Capstead will typically designate any Derivatives held as cash flow hedges.  To qualify as a cash flow hedge, at the inception of the hedge relationship the Company must document that the hedge relationship is anticipated to be highly effective and monitor ongoing effectiveness on at least a quarterly basis.  As long as the hedge relationship remains effective, the effective portion of changes in fair value of the Derivative is recorded in Accumulated other comprehensive income and the ineffective portion is recorded in interest expense.  The effective portion of changes in fair value is reclassified from Accumulated comprehensive income to earnings over the term of the Derivative primarily in the form of Derivative cash flows that are either in excess of or lower than market rates.  Changes in fair value of Derivatives not held as accounting hedges, if any, or for which the hedge relationship is no longer considered highly effective, are recorded in Miscellaneous other revenue (expense).
	Holding Derivatives creates exposure to credit risk related to the potential for failure on the part of counterparties to honor their commitments.  In addition, the Company is required to post collateral based on any declines in the market value of the Derivatives.  In the event of default by a counterparty, the Company may have difficulty recovering its collateral and may not receive payments provided for under the terms of the Derivative.  To mitigate this risk, the Company uses only well-established commercial banks as counterparties.  The Company uses interest rate swap agreements in cash flow hedge relationships in order to hedge variability in borrowing rates due to changes in the underlying benchmark interest rate related to a designated portion of its current and anticipated future borrowings.  Variable-rate swap payments to be received and any measured hedge ineffectiveness are recorded in interest expense as an offset to interest owed on the hedged borrowings that reset to market rates generally every 30 to 90 days.  Fixed-rate swap payments to be made are also recorded in interest expense.  The combination of these cash flows results in a relatively fixed rate on these borrowings, subject to certain adjustments.  These adjustments include changes in spreads between variable rates on the swap agreements and actual borrowing rates as well as the effects of measured hedge ineffectiveness.
	Cash collateral receivable from interest rate swap counterparties represents cash remitted to swap counterparties to meet initial and ongoing margin requirements that are based on the fair value of these Derivatives, including related interest receivable or payable under the terms of the agreements.  The Company may also remit mortgage securities to certain of its swap counterparties to meet ongoing margin requirements.  Such mortgage securities, if any, are included in Residential mortgage investments.  Similarly, Cash collateral payable to interest rate swap counterparties represents cash received from counterparties to meet margin call requirements.  For presentation purposes, the Company does not offset individual counterparty collateral receivables (or payables) with the recorded fair value of related interest rate swap agreements pursuant to master netting arrangements.  In addition, gross unrealized gains on Derivatives (recorded as assets) are stated separately from gross unrealized losses (recorded as liabilities) without regard to counterparty.
Equity-based Compensation	'
	Equity-based Compensation
	Equity-based compensation cost is measured at the fair value of the awards on the grant date and recognized as expense over the related requisite service or performance measurement periods.  Compensation cost for option awards is recognized on a straight-line basis over the requisite service period for each portion of an award that vests separately.  Compensation cost for stock awards subject only to service conditions is recognized on a straight-line basis over the requisite service period for the awards.  Compensation cost for stock awards and restricted stock units subject to performance conditions is recognized on a straight-line basis over the requisite measurement periods, subject to achieving the related performance conditions.
Income Taxes	'
	Income Taxes
	Capstead Mortgage Corporation and its qualified REIT subsidiaries (“Capstead REIT”) have elected to be taxed as a REIT.  As a result, Capstead REIT is not taxed on taxable income distributed to stockholders if certain REIT qualification tests are met.  Capstead’s policy is to distribute 100% of the taxable income of the REIT, after application of available tax attributes, within the time limits prescribed by the Internal Revenue Code (the “Code”), which may extend into the subsequent taxable year.  The Company may find it advantageous from time to time to elect taxable REIT subsidiary status for certain of its subsidiaries in which case taxable income of any such subsidiary would be subject to federal and, where applicable, state or local income taxes.  Any such income taxes are accounted for using the liability method.  Related deferred income tax assets and liabilities are determined based on differences between the financial reporting and tax bases of assets and liabilities and are measured using enacted tax rates and laws that will be in effect when the differences are expected to reverse.  The Company has not recognized any liabilities for unrecognized tax benefits using a “more likely than not” threshold for the recognition and measurement of the financial statement effects of tax positions taken on a tax return filing.  Should any such liabilities be recognized in future periods, the Company will record related interest and penalties in Other general and administrative expense.
Dividend Classification	'
	Dividend Classification
	Capstead records common and preferred share dividends in the Accumulated deficit component of Stockholders’ equity only to the extent of available earnings for the related period.  Any dividends declared in excess of available earnings are considered a return of capital for financial reporting purposes and are recorded as reductions of Paid-in capital.  The tax and financial reporting classification of dividends can differ primarily as a result of differences between taxable income and Net income and how taxable income is allocated to dividends paid.

NET_INCOME_PER_COMMON_SHARE_Ta

NET INCOME PER COMMON SHARE (Tables)	12 Months Ended
	Dec. 31, 2013
NET INCOME PER COMMON SHARE [Abstract]	'
Components Of Computation Of Basic And Diluted Net Income Per Common Share	'
	Components of the computation of basic and diluted net income per common share were as follows for the indicated periods (dollars in thousands, except per share amounts):
			Year ended December 31
			2013			2012			2011
	Basic net income per common share
	Numerator for basic net income per common share:
	Net income		$	126,487		$	163,626		$	160,204
	Preferred share dividends			(17,536	)		(21,021	)		(20,369	)
	Redemption preference premiums paid on Series A and Series B preferred shares*			(19,924	)		–			–
	Unvested stock award participation in earnings			(139	)		(372	)		(579	)
			$	88,888		$	142,233		$	139,256
	Denominator for basic net income per common share:
	Weighted average common shares outstanding			95,679			95,115			79,784
	Average unvested stock awards outstanding			(506	)		(522	)		(468	)
				95,173			94,593			79,316
			$	0.93		$	1.5		$	1.76
	Diluted net income per common share
	Numerator for diluted net income per common share:
	Net income available to common stockholders		$	88,888		$	142,233		$	139,256
	Dividends on dilutive convertible preferred shares			44			298			298
			$	88,932		$	142,531		$	139,554
	Denominator for diluted net income per common share:
	Basic weighted average common shares outstanding			95,173			94,593			79,316
	Net effect of dilutive stock and option awards			145			111			71
	Net effect of dilutive convertible preferred shares			75			308			309
				95,393			95,012			79,696
			$	0.93		$	1.5		$	1.75
		*	The Series A and Series B preferred shares were redeemed on June 13, 2013 (See NOTE 11).
Potentially Dilutive Securities Excluded From Computation Of Net Income Per Common Share	'
	Potentially dilutive securities excluded from the computation of net income per share because the effect of inclusion was antidilutive during the indicated periods were as follows (in thousands):
			Year ended December 31
			2013			2012			2011
	Antidilutive convertible preferred shares*			16,539			16,493			16,184
	Antidilutive equity awards excludable under the treasury stock method:
	Shares issuable under option awards			30			10			40
	Restricted stock units			243			–			–
		*	The Series A and Series B preferred shares were redeemed on June 13, 2013 (See NOTE 11).

RESIDENTIAL_MORTGAGE_INVESTMEN1

RESIDENTIAL MORTGAGE INVESTMENTS (Tables)	12 Months Ended
	Dec. 31, 2013
RESIDENTIAL MORTGAGE INVESTMENTS [Abstract]	'
Schedule Of Residential Mortgage Investments	'
	Residential mortgage investments classified by collateral type and interest rate characteristics were as follows as of the indicated dates (dollars in thousands):
			Unpaid		Investment		Amortized		Carrying		Net			Average
			Principal		Premiums		Cost Basis		Amount (a)		WAC (b)			Yield(b)
			Balance
	31-Dec-13
	Agency Securities:
	Fannie Mae/Freddie Mac:
	Fixed-rate		$	2,158	$	6	$	2,164	$	2,167		6.67	%		6.4	%
	ARMs			10,675,620		343,452		11,019,072		11,231,057		2.58			1.59
	Ginnie Mae ARMs			2,145,639		74,396		2,220,035		2,233,495		2.64			1.57
				12,823,417		417,854		13,241,271		13,466,719		2.59			1.59
	Residential mortgage loans:
	Fixed-rate			2,633		3		2,636		2,636		6.99			5.62
	ARMs			4,244		18		4,262		4,262		3.81			3.46
				6,877		21		6,898		6,898		5.03			4.27
	Collateral for structured financings			2,220		37		2,257		2,257		8.09			7.34
			$	12,832,514	$	417,912	$	13,250,426	$	13,475,874		2.59			1.59
	31-Dec-12
	Agency Securities:
	Fannie Mae/Freddie Mac:
	Fixed-rate		$	3,194	$	9	$	3,203	$	3,208		6.7			6.52
	ARMs			11,547,954		356,646		11,904,600		12,198,922		2.69			1.91
	Ginnie Mae ARMs			1,566,749		48,248		1,614,997		1,647,119		2.77			2.11
				13,117,897		404,903		13,522,800		13,849,249		2.7			1.94
	Residential mortgage loans:
	Fixed-rate			3,007		5		3,012		3,012		7.01			6.54
	ARMs			5,031		20		5,051		5,051		3.87			3.75
				8,038		25		8,063		8,063		5.04			4.78
	Collateral for structured financings			2,799		47		2,846		2,846		8.12			7.47
			$	13,128,734	$	404,975	$	13,533,709	$	13,860,158		2.71			1.94
	(a)	Includes unrealized gains and losses for residential mortgage investments classified as available-for-sale (see NOTE 9).
	(b)	Net WAC, or weighted average coupon, is the weighted average interest rate of the mortgage loans underlying the indicated investments net of servicing and other fees as of the indicated balance sheet date.  Net WAC is expressed as a percentage calculated on an annualized basis on the unpaid principal balances of the mortgage loans underlying these investments.  Average yield is presented for the year then ended, and is based on the cash component of interest income expressed as a percentage calculated on an annualized basis on average amortized cost basis (the “cash yield”) less the effects of amortizing investment premiums.  Investment premium amortization is determined using the interest method and incorporates actual and anticipated future mortgage prepayments.

REPURCHASE_ARRANGEMENTS_AND_SI1

REPURCHASE ARRANGEMENTS AND SIMILAR BORROWINGS (Tables)	12 Months Ended
	Dec. 31, 2013
REPURCHASE ARRANGEMENTS AND SIMILAR BORROWINGS [Abstract]	'
Schedule Of Repurchase Arrangements And Similar Borrowings	'
	Repurchase arrangements and similar borrowings (and related pledged collateral, including accrued interest receivable), classified by collateral type and remaining maturities, and related weighted average borrowing rates as of the indicated dates were as follows (dollars in thousands):
	Collateral Type		Collateral		Accrued			Borrowings		Average
			Carrying		Interest			Outstanding		Borrowing
			Amount		Receivable					Rates
	As of December 31, 2013:
	Borrowings with maturities of 30 days or less:
	Agency Securities		$	12,169,534	$	28,195		$	11,578,211		0.38	%
	Borrowings with maturities greater than 30 days:
	Agency Securities (31 to 90 days)			951,966		2,068			902,432		0.38
	Similar borrowings:
	Collateral for structured financings*			2,257		–			2,257		8.09
			$	13,123,757	$	30,263		$	12,482,900		0.38
	Year-end borrowing rates adjusted for effects of related derivative financial instruments (“Derivatives”) held as cash flow hedges (see NOTE 7)										0.49
	As of December 31, 2012:
	Borrowings with maturities of 30 days or less:
	Agency Securities		$	13,406,253	$	32,807		$	12,739,872		0.47
	Borrowings with maturities greater than 30 days:
	Agency Securities (31 to 90 days)			44,060		51			41,520		0.57
	Similar borrowings:
	Collateral for structured financings*			2,846		–			2,846		8.12
			$	13,453,159	$	32,858		$	12,784,238		0.47
	Year-end borrowing rates adjusted for effects of related Derivatives held as cash flow hedges										0.65
		*	The maturity of structured financings is directly affected by prepayments on the related mortgage pass-through securities pledged as collateral and these financings are subject to redemption by the residual bondholders.
Schedule Of Average Borrowings Outstanding	'
	Average borrowings outstanding differed from respective year-end balances during the indicated periods primarily due to changes in portfolio levels and differences in the timing of portfolio acquisitions relative to portfolio runoff as illustrated below (dollars in thousands):
			Year ended December 31
			2013					2012
			Average		Average			Average		Average
			Borrowings		Rate			Borrowings		Rate
	Average borrowings and rates for the indicated years, adjusted for the effects of related Derivatives held as cash flow hedges		$	12,702,941		0.52	%	$	12,442,706		0.56	%

USE_OF_DERIVATIVE_FINANCIAL_IN1

USE OF DERIVATIVE FINANCIAL INSTRUMENTS, OFFSETTING DISCLOSURES AND CHANGES IN OTHER COMPREHENSIVE INCOME BY COMPONENT (Tables)	12 Months Ended
	Dec. 31, 2013
USE OF DERIVATIVE FINANCIAL INSTRUMENTS, OFFSETTING DISCLOSURES AND CHANGES IN OTHER COMPREHENSIVE INCOME BY COMPONENT [Abstract]	'
Schedule of Swap Agreements Expiration Period and Characteristics	'
	During 2013 Capstead entered into new forward-starting swap agreements with notional amounts of $2.50 billion  requiring fixed rate interest payments averaging 0.50% for two-year periods that commence on various dates between January 2014 and April 2014.  Swap agreements with notional amounts totaling $2.90 billion requiring fixed rate interest payments averaging 0.85% expired during the year.  At December 31, 2013, the Company’s portfolio of financing-related swap positions had the following characteristics (dollars in thousands):
	Period of		Notional				Average Fixed Rate
	Contract Expiration		Amount				Payment Requirement
	Currently-paying contracts:
	First quarter 2014		$	200,000				0.6	%
	Second quarter 2014			400,000				0.51
	Third quarter 2014			200,000				0.51
	Fourth quarter 2014			500,000				0.58
	First quarter 2015			1,100,000				0.5
	Second quarter 2015			200,000				0.43
	Third quarter 2015			400,000				0.47
	Fourth quarter 2015			1,200,000				0.45
	(average expiration:  14 months)			4,200,000				0.5
	Forward-starting contracts:
	First quarter 2016			1,700,000				0.51
	Second quarter 2016			800,000				0.46
	(average expiration:  25 months)			2,500,000				0.5
	(average expiration:  18 months)		$	6,700,000
Impact of Derivative Instruments on Statements of Financial Performance and Financial Position	'
	Interest rate swap agreements are measured at fair value on a recurring basis primarily using Level Two Inputs in accordance with “Fair Value Measurements and Disclosures” (“ASC 820”).  In determining fair value estimates for these Derivatives, the Company utilizes the standard methodology of netting the discounted future fixed cash payments and the discounted future variable cash receipts which are based on expected future interest rates derived from observable market interest rate curves.  The Company also incorporates both its own nonperformance risk and its counterparties’ nonperformance risk in determining the fair value of these Derivatives.  In considering the effect of nonperformance risk, the Company considered the impact of netting and credit enhancements, such as collateral postings and guarantees, and has concluded that counterparty risk is not significant to the overall valuation of these agreements.  The following tables include fair value and other related disclosures regarding all Derivatives held as of and for the indicated periods (in thousands):
		Balance Sheet		31-Dec
		Location		2013				2012
	Balance sheet-related
	Swap agreements in a gain position (an asset) related to:
	Borrowings under repurchase arrangements	(a)		$	1,094			$	169
	Unsecured borrowings	(a)			3,911				–
	Swap agreements in a loss position (a liability) related to:
	Borrowings under repurchase arrangements	(a)			(11,304	)			(18,671	)
	Unsecured borrowings	(a)			–				(14,197	)
	Related net interest payable	(b)			(5,493	)			(7,788	)
				$	(11,792	)		$	(40,487	)
		(a)	The fair value of Derivatives with realized and unrealized gains are aggregated and recorded as an asset on the face of the Balance Sheet separately from the fair value of Derivatives with realized and unrealized losses that are recorded as a liability.  The amount of unrealized losses at December 31, 2013 scheduled to be recognized in the Statement of Income over the next twelve months primarily in the form of fixed-rate swap payments in excess of current market rates totaled $14.5 million.
		(b)	Included in “Accounts payable and accrued expenses” on the face of the Balance Sheet.
			Location of					Year ended December 31
			Gain or (Loss)
			Recognized in
			Net Income					2013				2012			2011
	Income statement-related
	Components of effect on interest expense:
	Amount of loss reclassified from Accumulated other comprehensive income related to the effective portion of active positions						$	(16,914	)		$	(19,882	)	$	(28,066	)
	Amount of gain (loss) recognized (ineffective portion)							24				(542	)		(827	)
	Increase in interest expense and decrease in Net income as a result of the use of Derivatives			*			$	(16,890	)		$	(20,424	)	$	(28,893	)
	Other comprehensive income-related
	Amount of gain (loss) recognized in Other comprehensive income (loss) (effective portion)						$	9,320			$	(22,262	)	$	(51,751	)
		*	Included in “Interest expense:  Repurchase arrangements and similar borrowings” on the face of the Statement of Income.
Schedule Of Offsetting Disclosures For All Derivatives Held And Repurchase Arrangements And Similar Borrowings Outstanding	'
	The Company’s swap agreements and borrowings under repurchase arrangements are subject to master netting arrangements in the event of default on, or termination of, any one contract.  See NOTE 6 for more information on the Company’s use of repurchase arrangements.  The following tables provide disclosures concerning offsetting of financial liabilities and Derivatives as of the indicated dates (in thousands):
			Offsetting of Derivative Assets
			Gross				Gross				Net Amounts			Gross Amounts Not Offset
							Amounts				of Assets			in the Balance Sheet(a)
			Amounts of				Offset in				Presented in			Financial			Cash			Net
			Recognized				the Balance				the Balance			Instruments			Collateral			Amount
			Assets				Sheet				Sheet						Received
	As of December 31, 2013:
	Counterparty 1		$	4,324			$	–			$	4,324		$	(4,324	)	$	–		$	–
	Counterparty 2			681				–				681			(681	)		–			–
			$	5,005			$	–			$	5,005		$	(5,005	)	$	–		$	–
	As of December 31, 2012:
	Counterparty 1		$	128			$	–			$	128		$	(128	)	$	–		$	–
	Counterparty 2			41				–				41			(41	)		–			–
			$	169			$	–			$	169		$	(169	)	$	–		$	–
			Offsetting of Financial Liabilities and Derivative Liabilities
			Gross				Gross				Net Amounts			Gross Amounts Not Offset
							Amounts				of Liabilities			in the Balance Sheet (c)
			Amounts of				Offset in				Presented in			Financial			Cash			Net
			Recognized				the Balance				the Balance			Instruments			Collateral			Amount
			Liabilities(b)				Sheet				Sheet (a)						Pledged
	As of December 31, 2013:
	Derivatives by counterparty:
	Counterparty 1		$	7,628			$	–			$	7,628		$	(4,324	)	$	(3,304	)	$	–
	Counterparty 2			7,588				–				7,588			(681	)		(6,907	)		–
	Counterparty 3			1,581				–				1,581			–			(1,581	)		–
				16,797				–				16,797			(5,005	)		(11,792	)		–
	Repurchase arrangements and similar borrowings			12,487,604				–				12,487,604			(12,487,604	)		–			–
			$	12,504,401			$	–			$	12,504,401		$	(12,492,609	)	$	(11,792	)	$	–
	As of December 31, 2012:
	Derivatives by counterparty:
	Counterparty 1		$	26,904			$	–			$	26,904		$	(128	)	$	(26,776	)	$	–
	Counterparty 2			12,357				–				12,357			(41	)		(11,500	)		816
	Counterparty 3			1,395				–				1,395			–			(1,395	)		–
				40,656				–				40,656			(169	)		(39,671	)		816
	Repurchase arrangements and similar borrowings			12,791,243				–				12,791,243			(12,791,243	)		–			–
			$	12,831,899			$	–			$	12,831,899		$	(12,791,412	)	$	(39,671	)	$	816
	(a)	Amounts presented are limited to recognized liabilities and cash collateral received associated with the indicated counterparty sufficient to reduce the related Net Amount to zero in accordance with ASU No. 2011-11, as amended by ASU No. 2013-01.
	(b)	Amounts include accrued interest of $5.5 million and $7.8 million on interest rate swap agreements and $4.7 million and $7.0 million on repurchase arrangements and similar borrowings, included in “Accounts payable and accrued expenses” on the face of the Balance Sheets as of December 31, 2013 and December 31, 2012, respectively.
	(c)	Amounts presented are limited to recognized assets and collateral pledged associated with the indicated counterparty sufficient to reduce the related Net Amount to zero in accordance with ASU No. 2011-11, as amended by ASU No. 2013-01.
Changes in Accumulated Other Comprehensive Income	'
	Changes in Accumulated other comprehensive income by component for the three years ended December 31, 2013 were as follows (in thousands):
			Gains and Losses on Cash Flow Hedges				Unrealized Gains and Losses on Available-for-Sale Securities				Total
	Balance at December 31, 2010		$	(6,474	)		$	180,374			$	173,900
	Activity for the year ended December 31, 2011:
	Other comprehensive income (loss) before reclassifications			(51,751	)			54,263				2,512
	Amounts reclassified from accumulated other comprehensive income			28,066				62				28,128
	Other comprehensive income (loss)			(23,685	)			54,325				30,640
	Balance at December 31, 2011			(30,159	)			234,699				204,540
	Activity for the year ended December 31, 2012:
	Other comprehensive income (loss) before reclassifications			(22,262	)			91,750				69,488
	Amounts reclassified from accumulated other comprehensive income			19,882				–				19,882
	Other comprehensive income (loss)			(2,380	)			91,750				89,370
	Balance at December 31, 2012			(32,539	)			326,449				293,910
	Activity for the year ended December 31, 2013:
	Other comprehensive income (loss) before reclassifications			9,320				(101,001	)			(91,681	)
	Amounts reclassified from accumulated other comprehensive income			16,914				–				16,914
	Other comprehensive income (loss)			26,234				(101,001	)			(74,767	)
	Balance at December 31, 2013		$	(6,305	)		$	225,448			$	219,143

UNSECURED_BORROWINGS_Tables

UNSECURED BORROWINGS (Tables)	12 Months Ended
	Dec. 31, 2013
UNSECURED BORROWINGS [Abstract]	'
Schedule Of Subordinated Note Balances And Related Weighted Average Interest Rates	'
	Note balances and related weighted average interest rates as of the indicated dates  (calculated including issue cost amortization) were as follows (dollars in thousands):
			31-Dec-13					31-Dec-12
			Borrowings		Average			Borrowings		Average
			Outstanding		Rate *			Outstanding		Rate *
	Junior subordinated notes associated with:
	Capstead Mortgage Trust I		$	35,000		8.31	%	$	36,083		8.31	%
	Capstead Mortgage Trust II			40,000		8.46			41,238		8.46
	Capstead Mortgage Trust III			25,000		8.78			25,774		8.78
			$	100,000		8.49		$	103,095		8.49
		*	The indicated weighted average rates have been in effect since issuance.  After considering cash flow hedges that coincide with the floating rate terms of these borrowings that begin in October and December 2015 for the notes associated with Capstead Mortgage Trusts I and II and September 2016 for the notes associated with Capstead Mortgage Trust III, the effective borrowing rate during the final 20 years of these borrowings will average 7.56%, subject to certain adjustments for the effects of measured hedge ineffectiveness, if any.

DISCLOSURES_REGARDING_FAIR_VAL1

DISCLOSURES REGARDING FAIR VALUES OF FINANCIAL INSTRUMENTS (Tables)	12 Months Ended
	Dec. 31, 2013
DISCLOSURES REGARDING FAIR VALUES OF FINANCIAL INSTRUMENTS [Abstract]	'
Financial Instruments Other Than Debt Securities	'
	Fair value disclosures for financial instruments other than debt securities were as follows as of the indicated dates (in thousands):
		31-Dec-13				31-Dec-12
		Carrying		Fair		Carrying		Fair
		Amount		Value		Amount		Value
	Financial assets:
	Residential mortgage loans	$	6,898	$	7,000	$	8,063	$	8,200
	Interest rate swap agreements		5,005		5,005		169		169
	Financial liabilities:
	Repurchase arrangements with initial terms of greater than 120 days		36,299		36,300		41,520		41,500
	Unsecured borrowings		100,000		101,000		103,095		104,600
	Interest rate swap agreements		11,304		11,304		32,868		32,868
Fair Value And Related Disclosures For Debt Securities	'
	Fair value and related disclosures for debt securities were as follows as of the indicated dates (in thousands):
		Amortized		Gross Unrealized
		Cost Basis		Gains		Losses		Fair Value
	As of December 31, 2013
	Agency Securities classified as available-for-sale:
	Fannie Mae/Freddie Mac	$	11,019,116	$	224,456	$	12,468	$	11,231,104
	Ginnie Mae		2,220,035		18,384		4,924		2,233,495
	Residential mortgage securities classified as held-to-maturity		4,376		211		–		4,587
	As of December 31, 2012
	Agency Securities classified as available-for-sale:
	Fannie Mae/Freddie Mac		11,904,660		296,114		1,787		12,198,987
	Ginnie Mae		1,614,997		32,298		176		1,647,119
	Residential mortgage securities classified as held-to-maturity		5,989		309		–		6,298
Securities In Unrealized Loss Position	'
		31-Dec-13				31-Dec-12
		Fair		Unrealized		Fair		Unrealized
		Value		Loss		Value		Loss
	Securities in an unrealized loss position:
	One year or greater	$	39,030	$	380	$	29,760	$	120
	Less than one year		2,857,724		17,012		751,645		1,843
		$	2,896,754	$	17,392	$	781,405	$	1,963

INCOME_TAXES_Tables

INCOME TAXES (Tables)	12 Months Ended
	Dec. 31, 2013
INCOME TAXES [Abstract]	'
Schedule Of Effective Income Tax Rate Reconciliation	'
	Capstead’s effective tax rate differs substantially from statutory federal income tax rates primarily due to the benefit of Capstead REIT’s status as a REIT, along with other items affecting the Company’s effective tax rate as illustrated below for the indicated periods (in thousands):
			Year ended December 31
			2013			2012			2011
	Income taxes computed at the federal statutory rate		$	44,270		$	57,269		$	37,171
	Benefit of REIT status			(44,270	)		(57,268	)		(37,183	)
	Income taxes computed on income of Capstead’s sole taxable REIT subsidiary			–			1			(12	)
	Change in net deferred income tax assets			1			(1	)		22
	Other			(1	)		–			(10	)
	Income tax provision		$	–		$	–		$	–
Components Of Deferred Tax Assets And Liabilities	'
	No income taxes were paid during 2013, 2012 or 2011.  Significant components of the Company’s taxable REIT subsidiary’s deferred income tax assets and liabilities were as follows as of the indicated dates (in thousands):
			31-Dec
			2013			2012
	Deferred income tax assets:
	Alternative minimum tax credit (a)		$	1,942		$	1,940
	Net operating loss carryforwards (b)			60			60
	Other			21			22
				2,023			2,022
	Deferred income tax liabilities			–			–
	Net deferred tax assets		$	2,023		$	2,022
	Valuation allowance (c)		$	2,023		$	2,022
		(a)	Alternative tax credit carryforwards can be utilized to offset payment of federal income taxes on future taxable income, if any, earned by this subsidiary, subject to certain limitations.
		(b)	Excludes $3.5 million in remaining net operating loss carryforwards which expire beginning after 2019.  To the extent these carryforwards are utilized in future periods, the benefit will reduce actual taxes payable.
		(c)	Because this subsidiary is not expected to earn significant amounts of taxable income, related net deferred tax assets are fully reserved at December 31, 2013.

COMPENSATION_PROGRAMS_Tables

COMPENSATION PROGRAMS (Tables)	12 Months Ended
	Dec. 31, 2013
COMPENSATION PROGRAMS [Abstract]	'
Schedule Of Dividend Equivalent Rights	'
	DERs issued and outstanding at December 31, 2013 and related compensation costs for the indicated periods were as follows:
			Total DERs			Year ended December 31
	Grant Date		Granted			2013		2012		2011
	Jul-08			225,000		$	279,000	$	335,000	$	396,000
	Jul-09			225,000			279,000		335,000		396,000
	Jul-10			60,000			75,000		89,000		105,000
	Aug-11			72,000			89,000		107,000		63,000
	Jul-12			72,000			89,000		48,000		–
				654,000		$	811,000	$	914,000	$	960,000
Schedule Of Performance-Based Stock Awards	'
	Information pertaining to absolute return performance-based stock awards issued to employees pursuant to this program is as follows:
	Year of		Grant Date			Total				Final		Remaining Shares with
			Fair Value			Original				Measurement		Initial Measurement Periods
										Period Ends		Ending December 31
	Grant		Per Share			Grants		Forfeited		31-Dec		2014		2015		2016
	2008 (a)		$	10.18			140,658		5,464		n/a		–		–		–
	2009 (b)			14.33			110,917		4,571		n/a		–		–		–
	2010 (c)			12.44			128,766		5,759		2017		61,499		–		–
	2011			12.72			132,490		5,050		2018		63,722		63,718		–
	2012			11.67			145,399		5,697		2019		–		69,853		69,849
		(a)	The absolute return metrics for the three-year measurement periods ending December 31, 2012 and 2011 were met resulting in the vesting of 67,595 shares associated with the second 50% of this grant in January 2013 and 67,599 shares associated with the first 50% of this grant in February 2012.
		(b)	The absolute return metrics for the three-year measurement periods ending December 31, 2013 and 2012 were met resulting in the vesting of 52,915 shares associated with the second 50% of this grant in January 2014 and 53,431 shares associated with the first 50% of this grant in January 2013.
		(c)	The absolute return metric for the first three-year measurement period ending December 31, 2013 was met resulting in the vesting of 61,508 shares associated with the first 50% of this grant in January 2014.
Schedule Of Service-Based Stock Awards	'
	Information pertaining to service-based stock awards issued to directors and employees (subject to certain restrictions, principally continuous service), is as follows:
	Year of		Grant Date			Total		As of December 31, 2013				Remaining Shares
			Fair Value			Original						Scheduled to Vest During:
	Grant		Per Share			Grants		Vested		Forfeited		2014		2017
	2007 (a)		$	12.93			156,000		121,004		12,832		22,164		–
	2008 (b)			12.87			6,000		6,000		–		–		–
	2009 (b)			11.39			6,000		6,000		–		–		–
	2010 (b)			11.64			12,000		12,000		–		–		–
	2011 (b)			13.23			24,000		24,000		–		–		–
	2012 (b)			13.59			29,000		29,000		–		–		–
	2013 (b)			13.02			28,000		–		–		28,000		–
	2013 (c)			12.34			35,703		–		–		–		35,703
		(a)	The remaining 2007 grant shares vested in January 2014.
		(b)	Director stock awards have been granted annually upon election or reelection to the board of directors.  These awards vest one year after issuance.
		(c)	In December 2013 the Committee granted service-based awards to employees that were not awarded performance-based restricted stock units.  These awards vest on January 2, 2017.
Schedule Of Performance- And Service- Based Stock Award Activity	'
	Performance-based and service-based stock award activity for year ended December 31, 2013 is summarized below:
			Number of			Weighted Average
			Shares			Grant Date
						Fair Value
	Unvested stock awards outstanding at beginning year			657,720		$	12.48
	Grants			63,703			12.64
	Vestings			(172,523	)		12.41
	Forfeitures			(19,969	)		12.65
	Unvested stock awards outstanding at end of year			528,931			12.51
Schedule Of Option Award Activity	'
	Option awards currently outstanding have ten-year contractual terms from the grant date and were issued with strike prices equal to the quoted market prices of Capstead’s common shares on the date of grant.  The fair value of option awards was estimated on the date of grant using a Black-Scholes option pricing model.  The Company estimated option exercises, expected holding periods and forfeitures based on past experience and expectations for option performance and employee or director attrition.  Risk-free rates were based on market rates for the expected life of the options.  Expected dividends were based on historical experience and expectations for future performance.  Expected volatility factors were based on historical experience.  No option awards have been granted since 2010.  Option award activity for the year ended December 31, 2013 is summarized below:
			Number of			Weighted Average
			Shares			Exercise Price
	Option awards outstanding at beginning of year			97,500		$	11.63
	Exercises			(15,000	)		10.61
	Forfeitures			(5,000	)		12.87
	Option awards outstanding at end of year			77,500			11.75

QUARTERLY_RESULTS_Tables

QUARTERLY RESULTS (Tables)	12 Months Ended
	Dec. 31, 2013
QUARTERLY RESULTS (UNAUDITED) [Abstract]	'
Summarized Quarterly Results Of Operations	'
	Summarized quarterly results of operations were as follows (in thousands, except per share amounts).
			First Quarter			Second Quarter			Third Quarter			Fourth Quarter
	Year Ended December 31, 2013
	Interest income on residential mortgage investments (before investment premium amortization)		$	86,867		$	85,214		$	85,674		$	83,254
	Investment premium amortization			(28,399	)		(33,642	)		(39,031	)		(24,800	)
	Related interest expense			(18,468	)		(16,749	)		(15,759	)		(15,392	)
				40,000			34,823			30,884			43,062
	Other interest income (expense) (a)			(2,010	)		(2,015	)		(2,074	)		(2,066	)
	Other revenue (expense)			(3,072	)		(2,914	)		(4,108	)		(4,023	)
	Net income		$	34,918		$	29,894		$	24,702		$	36,973
	Basic net income per common share (b)		$	0.31		$	0.04		$	0.23		$	0.35
	Diluted net income per common share (b)			0.31			0.04			0.23			0.35
	Year Ended December 31, 2012
	Interest income on residential mortgage investments (before investment premium amortization)		$	84,229		$	87,486		$	90,614		$	90,279
	Investment premium amortization			(18,496	)		(21,699	)		(27,151	)		(29,331	)
	Related interest expense			(14,103	)		(16,451	)		(17,875	)		(20,672	)
				51,630			49,336			45,588			40,276
	Other interest income (expense) (a)			(1,972	)		(1,946	)		(1,968	)		(1,904	)
	Other revenue (expense)			(4,488	)		(4,055	)		(3,583	)		(3,288	)
	Net income		$	45,170		$	43,335		$	40,037		$	35,084
	Basic net income per common share		$	0.45		$	0.4		$	0.35		$	0.31
	Diluted net income per common share			0.44			0.4			0.35			0.31
	(a)	Consists principally of interest on unsecured borrowings and is presented net of earnings of related statutory trusts.  These affiliates were dissolved in December 2013.
	(b)	Includes $0.23 associated with redemption preference premiums paid and other one-time effects of the second quarter’s preferred capital transactions.

ACCOUNTING_POLICIES_Details

ACCOUNTING POLICIES (Details)	12 Months Ended
	Dec. 31, 2013
Income Taxes [Abstract]	'
Percentage of taxable income to be distributed (in hundredths)	100.00%
Minimum [Member]	'
Derivative [Line Items]	'
Interest owed on hedged borrowings rest to market rates (in days)	'30 days
Maximum [Member]	'
Derivative [Line Items]	'
Interest owed on hedged borrowings rest to market rates (in days)	'90 days

NET_INCOME_PER_COMMON_SHARE_Co

NET INCOME PER COMMON SHARE - Components of Computation of Basic and Diluted Net Income Per Common Share (Details) (USD $)

3 Months Ended

12 Months Ended

In Thousands, except Per Share data, unless otherwise specified

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Numerator for basic net income per common share [Abstract]

'

'

'

'

'

'

'

'

'

'

'

Net income

$36,973

$24,702

$29,894

$34,918

$35,084

$40,037

$43,335

$45,170

$126,487

$163,626

$160,204

Preferred share dividends

'

'

'

'

'

'

'

'

-17,536

-21,021

-20,369

Redemption preference premiums paid on Series A and Series B preferred shares

'

'

'

'

'

'

'

'

-19,924

[1]

0

[1]

0

[1]

Unvested stock award participation in earnings

'

'

'

'

'

'

'

'

-139

-372

-579

Numerator for basic net income per common share

'

'

'

'

'

'

'

'

88,888

142,233

139,256

Denominator for basic net income per common share [Abstract]

'

'

'

'

'

'

'

'

'

'

'

Weighted average common shares outstanding (in shares)

'

'

'

'

'

'

'

'

95,679

95,115

79,784

Average unvested stock awards outstanding (in shares)

'

'

'

'

'

'

'

'

-506

-522

-468

Denominator for basic net income per common share (in shares)

'

'

'

'

'

'

'

'

95,173

94,593

79,316

Basic net income per common share (in dollars per share)

$0.35

[2]

$0.23

[2]

$0.04

[2]

$0.31

[2]

$0.31

$0.35

$0.40

$0.45

$0.93

$1.50

$1.76

Numerator for diluted net income per common share [Abstract]

'

'

'

'

'

'

'

'

'

'

'

Net income available to common stockholders

'

'

'

'

'

'

'

'

88,888

142,233

139,256

Dividends on dilutive convertible preferred shares

'

'

'

'

'

'

'

'

44

298

298

Numerator for diluted net income per common share

'

'

'

'

'

'

'

'

$88,932

$142,531

$139,554

Denominator for diluted net income per common share [Abstract]

'

'

'

'

'

'

'

'

'

'

'

Basic weighted average common shares outstanding (in shares)

'

'

'

'

'

'

'

'

95,173

94,593

79,316

Net effect of dilutive stock and option awards (in shares)

'

'

'

'

'

'

'

'

145

111

71

Net effect of dilutive convertible preferred shares (in shares)

'

'

'

'

'

'

'

'

75

308

309

Denominator for diluted net income per common share (in shares)

'

'

'

'

'

'

'

'

95,393

95,012

79,696

Diluted net income per common share (in dollars per share)

$0.35

[2]

$0.23

[2]

$0.04

[2]

$0.31

[2]

$0.31

$0.35

$0.40

$0.44

$0.93

$1.50

$1.75

[1]

The Series A and Series B preferred shares were redeemed on June 13, 2013 (See NOTE 11).

[2]

Includes $0.23 associated with redemption preference premiums paid and other one-time effects of the second quarterbs preferred capital transactions.

NET_INCOME_PER_COMMON_SHARE_Po

NET INCOME PER COMMON SHARE - Potentially Dilutive Securities Excluded from Computation of Net Income Per Common Share (Details)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Schedule of Earning Per Share, Basic, by Common Class [Line Items]	'		'		'
Antidilutive convertible preferred shares (in shares)	16,539	[1]	16,493	[1]	16,184	[1]
Shares issuable under option awards (in shares)	30		10		40
Restricted stock units (in shares)	243		0		0
7.50% Cumulative Redeemable Preferred Stock, Series E [Member]	'		'		'
Schedule of Earning Per Share, Basic, by Common Class [Line Items]	'		'		'
Preferred stock dividend rate (in hundredths)	7.50%		'		'
Redeemable Preferred Stock [Member] | 7.50% Cumulative Redeemable Preferred Stock, Series E [Member]	'		'		'
Schedule of Earning Per Share, Basic, by Common Class [Line Items]	'		'		'
Preferred stock dividend rate (in hundredths)	7.50%		'		'
[1]	The Series A and Series B preferred shares were redeemed on June 13, 2013 (See NOTE 11).

RESIDENTIAL_MORTGAGE_INVESTMEN2

RESIDENTIAL MORTGAGE INVESTMENTS - Schedule of Residential Mortgage Investments (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Schedule Of Residential Mortgage Investments [Line Items]	'		'
Unpaid Principal Balance	$12,832,514		$13,128,734
Investment Premiums	417,912		404,975
Amortized Cost Basis	13,250,426		13,533,709
Carrying Amount	13,475,874	[1]	13,860,158	[1]
Net WAC (in hundredths)	2.59%	[2]	2.71%	[2]
Average Yield (in hundredths)	1.59%	[2]	1.94%	[2]
Agency Securities [Member]	'		'
Schedule Of Residential Mortgage Investments [Line Items]	'		'
Unpaid Principal Balance	12,823,417		13,117,897
Investment Premiums	417,854		404,903
Amortized Cost Basis	13,241,271		13,522,800
Carrying Amount	13,466,719	[1]	13,849,249	[1]
Net WAC (in hundredths)	2.59%	[2]	2.70%	[2]
Average Yield (in hundredths)	1.59%	[2]	1.94%	[2]
Agency Securities [Member] | Fixed-Rate [Member]	'		'
Schedule Of Residential Mortgage Investments [Line Items]	'		'
Unpaid Principal Balance	2,158		3,194
Investment Premiums	6		9
Amortized Cost Basis	2,164		3,203
Carrying Amount	2,167	[1]	3,208	[1]
Net WAC (in hundredths)	6.67%	[2]	6.70%	[2]
Average Yield (in hundredths)	6.40%	[2]	6.52%	[2]
Agency Securities [Member] | ARMs [Member]	'		'
Schedule Of Residential Mortgage Investments [Line Items]	'		'
Unpaid Principal Balance	10,675,620		11,547,954
Investment Premiums	343,452		356,646
Amortized Cost Basis	11,019,072		11,904,600
Carrying Amount	11,231,057	[1]	12,198,922	[1]
Net WAC (in hundredths)	2.58%	[2]	2.69%	[2]
Average Yield (in hundredths)	1.59%	[2]	1.91%	[2]
Agency Securities [Member] | Ginnie Mae ARMs [Member]	'		'
Schedule Of Residential Mortgage Investments [Line Items]	'		'
Unpaid Principal Balance	2,145,639		1,566,749
Investment Premiums	74,396		48,248
Amortized Cost Basis	2,220,035		1,614,997
Carrying Amount	2,233,495	[1]	1,647,119	[1]
Net WAC (in hundredths)	2.64%	[2]	2.77%	[2]
Average Yield (in hundredths)	1.57%	[2]	2.11%	[2]
Residential Mortgage Loans [Member]	'		'
Schedule Of Residential Mortgage Investments [Line Items]	'		'
Unpaid Principal Balance	6,877		8,038
Investment Premiums	21		25
Amortized Cost Basis	6,898		8,063
Carrying Amount	6,898	[1]	8,063	[1]
Net WAC (in hundredths)	5.03%	[2]	5.04%	[2]
Average Yield (in hundredths)	4.27%	[2]	4.78%	[2]
Residential Mortgage Loans [Member] | Fixed-Rate [Member]	'		'
Schedule Of Residential Mortgage Investments [Line Items]	'		'
Unpaid Principal Balance	2,633		3,007
Investment Premiums	3		5
Amortized Cost Basis	2,636		3,012
Carrying Amount	2,636	[1]	3,012	[1]
Net WAC (in hundredths)	6.99%	[2]	7.01%	[2]
Average Yield (in hundredths)	5.62%	[2]	6.54%	[2]
Residential Mortgage Loans [Member] | ARMs [Member]	'		'
Schedule Of Residential Mortgage Investments [Line Items]	'		'
Unpaid Principal Balance	4,244		5,031
Investment Premiums	18		20
Amortized Cost Basis	4,262		5,051
Carrying Amount	4,262	[1]	5,051	[1]
Net WAC (in hundredths)	3.81%	[2]	3.87%	[2]
Average Yield (in hundredths)	3.46%	[2]	3.75%	[2]
Collateral For Structured Financings [Member]	'		'
Schedule Of Residential Mortgage Investments [Line Items]	'		'
Unpaid Principal Balance	2,220		2,799
Investment Premiums	37		47
Amortized Cost Basis	2,257		2,846
Carrying Amount	$2,257	[1]	$2,846	[1]
Net WAC (in hundredths)	8.09%	[2]	8.12%	[2]
Average Yield (in hundredths)	7.34%	[2]	7.47%	[2]
[1]	Includes unrealized gains and losses for residential mortgage investments classified as available-for-sale (see NOTE 9).
[2]	Net WAC, or weighted average coupon, is the weighted average interest rate of the mortgage loans underlying the indicated investments net of servicing and other fees as of the indicated balance sheet date. Net WAC is expressed as a percentage calculated on an annualized basis on the unpaid principal balances of the mortgage loans underlying these investments. Average yield is presented for the year then ended, and is based on the cash component of interest income expressed as a percentage calculated on an annualized basis on average amortized cost basis (the bcash yieldb) less the effects of amortizing investment premiums. Investment premium amortization is determined using the interest method and incorporates actual and anticipated future mortgage prepayments.

RESIDENTIAL_MORTGAGE_INVESTMEN3

RESIDENTIAL MORTGAGE INVESTMENTS - Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule Of Residential Mortgage Investments [Line Items]	'	'	'
Mortgage securities weighted average contractual maturity, months	'289 months	'	'
Gains on unit sales	'	$44,000	'
Operating costs, net of gains on unit sales	'	'	277,000
Impairment charge	'	'	470,000
Current-Reset ARMs [Member]	'	'	'
Schedule Of Residential Mortgage Investments [Line Items]	'	'	'
Investments held, basis amount	7,480,000,000	'	'
Agency securities average months to roll, months	'6 months 3 days	'	'
Current-Reset ARMs [Member] | Maximum [Member]	'	'	'
Schedule Of Residential Mortgage Investments [Line Items]	'	'	'
Agency securities months to roll	'18 months	'	'
Longer-To-Reset ARMs [Member]	'	'	'
Schedule Of Residential Mortgage Investments [Line Items]	'	'	'
Investments held, basis amount	5,760,000,000	'	'
Agency securities average months to roll, months	'38 months 21 days	'	'
Longer-To-Reset ARMs [Member] | Minimum [Member]	'	'	'
Schedule Of Residential Mortgage Investments [Line Items]	'	'	'
Agency securities months to roll	'18 months	'	'

INVESTMENTS_IN_UNCONSOLIDATED_1

INVESTMENTS IN UNCONSOLIDATED AFFILIATES (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013
INVESTMENTS IN UNCONSOLIDATED AFFILIATES [Abstract]	'
Issuance of common securities	$3.10

REPURCHASE_ARRANGEMENTS_AND_SI2

REPURCHASE ARRANGEMENTS AND SIMILAR BORROWINGS - Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Repurchase Arrangements And Similar Borrowings, Including Interest Rate Hedging Activity [Line Items]	'	'	'
Cash received in lieu of return of pledged collateral	'	'	$8,300,000
Loss on sale of securities	'	'	62,000
Repurchase Arrangements And Similar Borrowings [Member]	'	'	'
Repurchase Arrangements And Similar Borrowings, Including Interest Rate Hedging Activity [Line Items]	'	'	'
Interest paid on Repurchase arrangements and similar borrowings	$71,100,000	$69,500,000	$55,200,000
Minimum [Member]	'	'	'
Repurchase Arrangements And Similar Borrowings, Including Interest Rate Hedging Activity [Line Items]	'	'	'
Maturity period of repurchase arrangements	'P30D	'	'
Maximum [Member]	'	'	'
Repurchase Arrangements And Similar Borrowings, Including Interest Rate Hedging Activity [Line Items]	'	'	'
Maturity period of repurchase arrangements	'P90D	'	'

REPURCHASE_ARRANGEMENTS_AND_SI3

REPURCHASE ARRANGEMENTS AND SIMILAR BORROWINGS - Schedule Of Repurchase Arrangements And Similar Borrowings (Details) (USD $)	Dec. 31, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified
Repurchase Arrangements And Similar Borrowings, Including Interest Rate Hedging Activity [Line Items]	'		'
Collateral Carrying Amount	$13,123,757		$13,453,159
Agency Securities [Member]	'		'
Repurchase Arrangements And Similar Borrowings, Including Interest Rate Hedging Activity [Line Items]	'		'
Collateral Carrying Amount	13,123,757		13,453,159
Accrued Interest Receivable	30,263		32,858
Borrowings Outstanding	12,482,900		12,784,238
Average Borrowing Rates (in hundredths)	0.38%		0.47%
Year-End Borrowing Rates Adjusted For Effects Of Related Derivatives Held As Cash Flow Hedges [Member]	'		'
Repurchase Arrangements And Similar Borrowings, Including Interest Rate Hedging Activity [Line Items]	'		'
Average Borrowing Rates (in hundredths)	0.49%		0.65%
Borrowings With Maturities Of 30 Days Or Less [Member] | Agency Securities [Member]	'		'
Repurchase Arrangements And Similar Borrowings, Including Interest Rate Hedging Activity [Line Items]	'		'
Collateral Carrying Amount	12,169,534		13,406,253
Accrued Interest Receivable	28,195		32,807
Borrowings Outstanding	11,578,211		12,739,872
Average Borrowing Rates (in hundredths)	0.38%		0.47%
Borrowings With Maturities Of 31 To 90 Days [Member] | Agency Securities [Member]	'		'
Repurchase Arrangements And Similar Borrowings, Including Interest Rate Hedging Activity [Line Items]	'		'
Collateral Carrying Amount	951,966		44,060
Accrued Interest Receivable	2,068		51
Borrowings Outstanding	902,432		41,520
Average Borrowing Rates (in hundredths)	0.38%		0.57%
Collateral For Structured Financings [Member] | Agency Securities [Member]	'		'
Repurchase Arrangements And Similar Borrowings, Including Interest Rate Hedging Activity [Line Items]	'		'
Collateral Carrying Amount	2,257	[1]	2,846	[1]
Accrued Interest Receivable	0	[1]	0	[1]
Borrowings Outstanding	$2,257	[1]	$2,846	[1]
Average Borrowing Rates (in hundredths)	8.09%	[1]	8.12%	[1]
[1]	The maturity of structured financings is directly affected by prepayments on the related mortgage pass-through securities pledged as collateral and these financings are subject to redemption by the residual bondholders.

REPURCHASE_ARRANGEMENTS_AND_SI4

REPURCHASE ARRANGEMENTS AND SIMILAR BORROWINGS - Schedule of Average Borrowings Outstanding (Details) (Average Borrowings And Rates For The Indicated Years, Adjusted For The Effects Of Related Derivatives Held As Cash Flow Hedges [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Average Borrowings And Rates For The Indicated Years, Adjusted For The Effects Of Related Derivatives Held As Cash Flow Hedges [Member]	'	'
Repurchase Arrangements And Similar Borrowings, Including Interest Rate Hedging Activity [Line Items]	'	'
Average Borrowings	$12,702,941	$12,442,706
Average Rate (in hundredths)	0.52%	0.56%

USE_OF_DERIVATIVE_FINANCIAL_IN2

USE OF DERIVATIVE FINANCIAL INSTRUMENTS, OFFSETTING DISCLOSURES AND CHANGES IN OTHER COMPREHENSIVE INCOME BY COMPONENT - Schedule of Swap Agreements (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2010	Dec. 31, 2012
Derivative Instruments And Hedging Activities [Line Items]	'	'	'
Derivative, average remaining maturity	'18 months	'	'
Notional Amount	$6,700,000,000	'	'
Derivative Instruments Unrealized Losses To Be Recognized	14,500,000	'	'
Interest Rate SWAP Currently-Paying Contracts [Member]	'	'	'
Derivative Instruments And Hedging Activities [Line Items]	'	'	'
Derivative, average remaining maturity	'14 months	'	'
Notional Amount	4,200,000,000	'	'
Average Fixed Rate Payment Requirement (in hundredths)	0.50%	'	'
Interest Rate SWAP Currently-Paying Contracts [Member] | First Quarter 2014 [Member]	'	'	'
Derivative Instruments And Hedging Activities [Line Items]	'	'	'
Notional Amount	200,000,000	'	'
Average Fixed Rate Payment Requirement (in hundredths)	0.60%	'	'
Interest Rate SWAP Currently-Paying Contracts [Member] | Second Quarter 2014 [Member]	'	'	'
Derivative Instruments And Hedging Activities [Line Items]	'	'	'
Notional Amount	400,000,000	'	'
Average Fixed Rate Payment Requirement (in hundredths)	0.51%	'	'
Interest Rate SWAP Currently-Paying Contracts [Member] | Third Quarter 2014 [Member]	'	'	'
Derivative Instruments And Hedging Activities [Line Items]	'	'	'
Notional Amount	200,000,000	'	'
Average Fixed Rate Payment Requirement (in hundredths)	0.51%	'	'
Interest Rate SWAP Currently-Paying Contracts [Member] | Fourth Quarter 2014 [Member]	'	'	'
Derivative Instruments And Hedging Activities [Line Items]	'	'	'
Notional Amount	500,000,000	'	'
Average Fixed Rate Payment Requirement (in hundredths)	0.58%	'	'
Interest Rate SWAP Currently-Paying Contracts [Member] | First Quarter 2015 [Member]	'	'	'
Derivative Instruments And Hedging Activities [Line Items]	'	'	'
Notional Amount	1,100,000,000	'	'
Average Fixed Rate Payment Requirement (in hundredths)	0.50%	'	'
Interest Rate SWAP Currently-Paying Contracts [Member] | Second Quarter 2015 [Member]	'	'	'
Derivative Instruments And Hedging Activities [Line Items]	'	'	'
Notional Amount	200,000,000	'	'
Average Fixed Rate Payment Requirement (in hundredths)	0.43%	'	'
Interest Rate SWAP Currently-Paying Contracts [Member] | Third Quarter 2015 [Member]	'	'	'
Derivative Instruments And Hedging Activities [Line Items]	'	'	'
Notional Amount	400,000,000	'	'
Average Fixed Rate Payment Requirement (in hundredths)	0.47%	'	'
Interest Rate SWAP Currently-Paying Contracts [Member] | Fourth Quarter 2015 [Member]	'	'	'
Derivative Instruments And Hedging Activities [Line Items]	'	'	'
Notional Amount	1,200,000,000	'	'
Average Fixed Rate Payment Requirement (in hundredths)	0.45%	'	'
Interest Rate SWAP Forward-Starting Contracts [Member]	'	'	'
Derivative Instruments And Hedging Activities [Line Items]	'	'	'
Derivative, average remaining maturity	'25 months	'	'
Notional Amount	2,500,000,000	'	'
Average Fixed Rate Payment Requirement (in hundredths)	0.50%	'	'
Interest Rate SWAP Forward-Starting Contracts [Member] | First Quarter 2016 [Member]	'	'	'
Derivative Instruments And Hedging Activities [Line Items]	'	'	'
Notional Amount	1,700,000,000	'	'
Average Fixed Rate Payment Requirement (in hundredths)	0.51%	'	'
Interest Rate SWAP Forward-Starting Contracts [Member] | Second quarter 2016 [Member]	'	'	'
Derivative Instruments And Hedging Activities [Line Items]	'	'	'
Notional Amount	800,000,000	'	'
Average Fixed Rate Payment Requirement (in hundredths)	0.46%	'	'
Interest Rate Swap Agreements [Member]	'	'	'
Derivative Instruments And Hedging Activities [Line Items]	'	'	'
SWAP agreement notional amount during period	2,500,000,000	100,000,000	'
SWAP agreement average interest rate during period (in hundredths)	0.50%	4.09%	'
Swap agreement notional amount expiring during period	2,900,000,000	'	'
SWAP agreement average interest rate expiring during period (in hundredths)	0.85%	'	'
Payment term of LIBOR interest rate agreement	'2 years	'20 years	'
Accrued Interest	5,500,000	'	7,800,000
Interest Rate Swap Expired One [Member]	'	'	'
Derivative Instruments And Hedging Activities [Line Items]	'	'	'
Payment term of LIBOR interest rate agreement	'2 years	'	'
Repurchase Arrangements And Similar Borrowings [Member]	'	'	'
Derivative Instruments And Hedging Activities [Line Items]	'	'	'
Accrued Interest	$4,700,000	'	$7,000,000

USE_OF_DERIVATIVE_FINANCIAL_IN3

USE OF DERIVATIVE FINANCIAL INSTRUMENTS, OFFSETTING DISCLOSURES AND CHANGES IN OTHER COMPREHENSIVE INCOME BY COMPONENT - Balance Sheet and Income Statement Location (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Balance sheet-related [Abstract]	'		'		'
Interest rate swap agreements at fair value, net assets (liability)	($11,792)		($40,487)		'
Other Comprehensive Income (Loss) [Member]	'		'		'
Other comprehensive income related [Abstract]	'		'		'
Amount of gain (loss recognized in Other comprehensive income (loss) (effective portion)	9,320		-22,262		-51,751
Interest Expense [Member]	'		'		'
Income statement-related [Abstract]	'		'		'
Amount of loss reclassified from Accumulated other comprehensive income related to the effective portion of active positions	-16,914		-19,882		-28,066
Amount of gain (loss) recognized (ineffective portion)	24		-542		-827
Increase in interest expense and decrease in Net income as a result of the use of Derivatives	-16,890	[1]	-20,424	[1]	-28,893	[1]
Other Assets [Member]	'		'		'
Balance sheet-related [Abstract]	'		'		'
Related net interest payable	-5,493	[2]	-7,788	[2]	'
Borrowings Under Repurchase Arrangements [Member] | Other Assets [Member]	'		'		'
Balance sheet-related [Abstract]	'		'		'
Interest rate swap agreements in a gain position (an asset)	1,094	[3]	169	[3]	'
Interest rate swap agreements in a loss position (a liability)	-11,304	[3]	-18,671	[3]	'
Unsecured Borrowings [Member] | Other Assets [Member]	'		'		'
Balance sheet-related [Abstract]	'		'		'
Interest rate swap agreements in a gain position (an asset)	3,911		0		'
Interest rate swap agreements in a loss position (a liability)	$0	[3]	($14,197)	[3]	'
[1]	Included in "Interest expense: Repurchase arrangements and similar borrowings" on the face of the Statement of Income.
[2]	Included in "Accounts payable and accrued expenses" on the face of the Balance Sheet.
[3]	The fair value of Derivatives with realized and unrealized gains are aggregated and recorded as an asset on the face of the Balance Sheet separately from the fair value of Derivatives with realized and unrealized losses that are recorded as a liability. The amount of unrealized losses at December 31, 2013 scheduled to be recognized in the Statement of Income over the next twelve months primarily in the form of fixed-rate swap payments in excess of current market rates totaled $14.5 million.

USE_OF_DERIVATIVE_FINANCIAL_IN4

USE OF DERIVATIVE FINANCIAL INSTRUMENTS, OFFSETTING DISCLOSURES AND CHANGES IN OTHER COMPREHENSIVE INCOME BY COMPONENT - Offsetting Assets and Liabilities (Details) (USD $)	Dec. 31, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified
Offsetting of derivative assets [Abstract]	'		'
Gross Amounts of Recognized Assets	$5,005		$169
Net Amounts of Assets Presented in the Balance Sheet	-11,792		-40,487
Cash Collateral Received	25,502		49,972
Offsetting of financial liabilities and derivative liabilities [Abstract]	'		'
Gross Amounts of Recognized Liabilities	11,304		32,868
Offsetting Derivatives Assets [Member] | Counterparty 1 [Member]	'		'
Offsetting of derivative assets [Abstract]	'		'
Gross Amounts of Recognized Assets	4,324		128
Gross Amounts Offset in the Balance Sheet	0		0
Net Amounts of Assets Presented in the Balance Sheet	4,324		128
Financial Instruments	-4,324	[1]	-128	[1]
Cash Collateral Received	0	[1]	0	[1]
Net Amount	0		0
Offsetting Derivatives Assets [Member] | Counterparty 2 [Member]	'		'
Offsetting of derivative assets [Abstract]	'		'
Gross Amounts of Recognized Assets	681		41
Gross Amounts Offset in the Balance Sheet	0		0
Net Amounts of Assets Presented in the Balance Sheet	681		41
Financial Instruments	-681	[1]	-41	[1]
Cash Collateral Received	0	[1]	0	[1]
Net Amount	0		0
Offsetting Derivatives Assets [Member] | Derivative Counterparties [Member]	'		'
Offsetting of derivative assets [Abstract]	'		'
Gross Amounts of Recognized Assets	5,005		169
Gross Amounts Offset in the Balance Sheet	0		0
Net Amounts of Assets Presented in the Balance Sheet	5,005		169
Financial Instruments	-5,005	[1]	-169	[1]
Cash Collateral Received	0	[1]	0	[1]
Net Amount	0		0
Offsetting Financial Liabilities and Derivative Liabilities [Member]	'		'
Offsetting of financial liabilities and derivative liabilities [Abstract]	'		'
Gross Amounts of Recognized Liabilities	12,504,401	[2]	12,831,899	[2]
Gross Amounts Offset in the Balance Sheet	0		0
Net Amounts of Liabilities Presented in the Balance Sheet	12,504,401	[1],[2]	12,831,899	[1],[2]
Financial Instruments	-12,492,609	[3]	-12,791,412	[3]
Cash Collateral Pledged	-11,792	[3]	-39,671	[3]
Net Amount	0		816
Offsetting Financial Liabilities and Derivative Liabilities [Member] | Repurchase Arrangements and Similar Borrowings [Member]	'		'
Offsetting of financial liabilities and derivative liabilities [Abstract]	'		'
Gross Amounts of Recognized Liabilities	12,487,604	[2]	12,791,243	[2]
Gross Amounts Offset in the Balance Sheet	0		0
Net Amounts of Liabilities Presented in the Balance Sheet	12,487,604	[1],[2]	12,791,243	[1],[2]
Financial Instruments	-12,487,604	[3]	-12,791,243	[3]
Cash Collateral Pledged	0	[3]	0	[3]
Net Amount	0		0
Offsetting Financial Liabilities and Derivative Liabilities [Member] | Counterparty 1 [Member]	'		'
Offsetting of financial liabilities and derivative liabilities [Abstract]	'		'
Gross Amounts of Recognized Liabilities	7,628	[2]	26,904	[2]
Gross Amounts Offset in the Balance Sheet	0		0
Net Amounts of Liabilities Presented in the Balance Sheet	7,628	[1],[2]	26,904	[1],[2]
Financial Instruments	-4,324	[3]	-128	[3]
Cash Collateral Pledged	-3,304	[3]	-26,776	[3]
Net Amount	0		0
Offsetting Financial Liabilities and Derivative Liabilities [Member] | Counterparty 2 [Member]	'		'
Offsetting of financial liabilities and derivative liabilities [Abstract]	'		'
Gross Amounts of Recognized Liabilities	7,588	[2]	12,357	[2]
Gross Amounts Offset in the Balance Sheet	0		0
Net Amounts of Liabilities Presented in the Balance Sheet	7,588	[1],[2]	12,357	[1],[2]
Financial Instruments	-681	[3]	-41	[3]
Cash Collateral Pledged	-6,907	[3]	-11,500	[3]
Net Amount	0		816
Offsetting Financial Liabilities and Derivative Liabilities [Member] | Counterparty 3 [Member]	'		'
Offsetting of financial liabilities and derivative liabilities [Abstract]	'		'
Gross Amounts of Recognized Liabilities	1,581	[2]	1,395	[2]
Gross Amounts Offset in the Balance Sheet	0		0
Net Amounts of Liabilities Presented in the Balance Sheet	1,581	[1],[2]	1,395	[1],[2]
Financial Instruments	0	[3]	0	[3]
Cash Collateral Pledged	-1,581	[3]	-1,395	[3]
Net Amount	0		0
Offsetting Financial Liabilities and Derivative Liabilities [Member] | Derivative Counterparties [Member]	'		'
Offsetting of financial liabilities and derivative liabilities [Abstract]	'		'
Gross Amounts of Recognized Liabilities	16,797	[2]	40,656	[2]
Gross Amounts Offset in the Balance Sheet	0		0
Net Amounts of Liabilities Presented in the Balance Sheet	16,797	[1],[2]	40,656	[1],[2]
Financial Instruments	-5,005	[3]	-169	[3]
Cash Collateral Pledged	-11,792	[3]	-39,671	[3]
Net Amount	$0		$816
[1]	Amounts presented are limited to recognized liabilities and cash collateral received associated with the indicated counterparty sufficient to reduce the related Net Amount to zero in accordance with ASU No. 2011-11, as amended by ASU No. 2013-01.
[2]	Amounts include accrued interest of $5.5 million and $7.8 million on interest rate swap agreements and $4.7 million and $7.0 million on repurchase arrangements and similar borrowings, included in bAccounts payable and accrued expensesb on the face of the Balance Sheets as of December 31, 2013 and December 31, 2012, respectively.
[3]	Amounts presented are limited to recognized assets and collateral pledged associated with the indicated counterparty sufficient to reduce the related Net Amount to zero in accordance with ASU No. 2011-11, as amended by ASU No. 2013-01.

USE_OF_DERIVATIVE_FINANCIAL_IN5

USE OF DERIVATIVE FINANCIAL INSTRUMENTS, OFFSETTING DISCLOSURES AND CHANGES IN OTHER COMPREHENSIVE INCOME BY COMPONENT - Changes in AOCI (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated other comprehensive income (loss) [Line Items]	'	'	'
Beginning Balance	$293,910	$204,540	$173,900
Other comprehensive income (loss) before reclassifications	-91,681	69,488	2,512
Amounts reclassified from accumulated other comprehensive income	16,914	19,882	28,128
Net other comprehensive income (loss)	-74,767	89,370	30,640
Ending Balance	219,143	293,910	204,540
Gains and Losses on Cash Flow Hedges [Member]	'	'	'
Accumulated other comprehensive income (loss) [Line Items]	'	'	'
Beginning Balance	-32,539	-30,159	-6,474
Other comprehensive income (loss) before reclassifications	9,320	-22,262	-51,751
Amounts reclassified from accumulated other comprehensive income	16,914	19,882	28,066
Net other comprehensive income (loss)	26,234	-2,380	-23,685
Ending Balance	-6,305	-32,539	-30,159
Unrealized Gains and Losses on Available-for-sale Securities [Member]	'	'	'
Accumulated other comprehensive income (loss) [Line Items]	'	'	'
Beginning Balance	326,449	234,699	180,374
Other comprehensive income (loss) before reclassifications	-101,001	91,750	54,263
Amounts reclassified from accumulated other comprehensive income	0	0	62
Net other comprehensive income (loss)	-101,001	91,750	54,325
Ending Balance	$225,448	$326,449	$234,699

UNSECURED_BORROWINGS_Narrative

UNSECURED BORROWINGS - Narrative (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013
Debt Instrument [Line Items]	'
Junior subordinated notes maturity term	'30 years
Issuance of common securities	$3.10
Remaining issue costs	2.2
Capstead Mortgage Trust I [Member]	'
Debt Instrument [Line Items]	'
Junior subordinated notes, maturity period	31-Oct-35
Capstead Mortgage Trust II [Member]	'
Debt Instrument [Line Items]	'
Junior subordinated notes, maturity period	31-Dec-35
Junior subordinated notes, earliest redemption option exercise date	15-Dec-15
Capstead Mortgage Trust III [Member]	'
Debt Instrument [Line Items]	'
Junior subordinated notes, maturity period	30-Sep-36
Junior subordinated notes, earliest redemption option exercise date	15-Sep-16
Interest paid on outstanding borrowings	8.6
Special-Purpose Statutory Trusts [Member]	'
Debt Instrument [Line Items]	'
Issuance of common securities	3.1
Proceeds from private placement of preferred securities	$100

UNSECURED_BORROWINGS_Schedule_

UNSECURED BORROWINGS - Schedule of Subordinated Note Balances and Related Weighted Average Interest Rate (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Debt Instrument [Line Items]	'		'
Borrowings Outstanding	$100,000		$103,095
Junior subordinated notes, remaining maturity	'20 years		'
For Final 20 Years [Member]	'		'
Debt Instrument [Line Items]	'		'
Effective borrowing rate considering cash flow hedges	7.56%		'
Capstead Mortgage Trust I [Member]	'		'
Debt Instrument [Line Items]	'		'
Borrowings Outstanding	35,000		36,083
Average Rate (in hundredths)	8.31%	[1]	8.31%	[1]
Capstead Mortgage Trust II [Member]	'		'
Debt Instrument [Line Items]	'		'
Borrowings Outstanding	40,000		41,238
Average Rate (in hundredths)	8.46%	[1]	8.46%	[1]
Capstead Mortgage Trust III [Member]	'		'
Debt Instrument [Line Items]	'		'
Borrowings Outstanding	25,000		25,774
Average Rate (in hundredths)	8.78%	[1]	8.78%	[1]
Junior Subordinated Debt [Member]	'		'
Debt Instrument [Line Items]	'		'
Borrowings Outstanding	$100,000		$103,095
Average Rate (in hundredths)	8.49%	[1]	8.49%	[1]
[1]	The indicated weighted average rates have been in effect since issuance. After considering cash flow hedges that coincide with the floating rate terms of these borrowings that begin in October and December 2015 for the notes associated with Capstead Mortgage Trusts I and II and September 2016 for the notes associated with Capstead Mortgage Trust III, the effective borrowing rate during the final 20 years of these borrowings will average 7.56%, subject to certain adjustments for the effects of measured hedge ineffectiveness, if any.

DISCLOSURES_REGARDING_FAIR_VAL2

DISCLOSURES REGARDING FAIR VALUES OF FINANCIAL INSTRUMENTS - Narrative (Details) (Maximum [Member])	12 Months Ended
	Dec. 31, 2013
Maximum [Member]	'
Fair value, balance sheet grouping [Line Items]	'
Repurchase arrangements with initial terms in days	'120 days

DISCLOSURES_REGARDING_FAIR_VAL3

DISCLOSURES REGARDING FAIR VALUES OF FINANCIAL INSTRUMENTS - Balance Sheet Location (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Financial assets [Abstract]	'	'
Interest rate swap agreements at fair value	$5,005	$169
Carrying Amount [Member]	'	'
Financial assets [Abstract]	'	'
Residential mortgage loans	6,898	8,063
Interest rate swap agreements at fair value	5,005	169
Financial liabilities [Abstract]	'	'
Repurchase arrangements with initial terms of greater than 120 days, Fair Value	36,299	41,520
Unsecured borrowings	100,000	103,095
Interest rate swap agreements	11,304	32,868
Fair Value [Member]	'	'
Financial assets [Abstract]	'	'
Residential mortgage loans	7,000	8,200
Interest rate swap agreements at fair value	5,005	169
Financial liabilities [Abstract]	'	'
Repurchase arrangements with initial terms of greater than 120 days, Fair Value	36,300	41,500
Unsecured borrowings	101,000	104,600
Interest rate swap agreements	$11,304	$32,868

DISCLOSURES_REGARDING_FAIR_VAL4

DISCLOSURES REGARDING FAIR VALUES OF FINANCIAL INSTRUMENTS - Fair Value and Related Disclosures for Debt Securities (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Residential Mortgage Securities Classified as held-to-Maturity [Member]	'	'
Held-to-maturity securities disclosure [Abstract]	'	'
Held-to-maturities, Amortized Cost Basis	$4,376	$5,989
Held-to-maturities, Gains	211	309
Held-to-maturities, Losses	0	0
Held-to-maturities, Fair Value	4,587	6,298
Fannie Mae/Freddie Mac [Member] | Agency Securities Classified as Available-for-sale [Member]	'	'
Available-for-sale securities disclosure Items [Abstract]	'	'
Available-for-sale securities, Amortized Cost Basis	11,019,116	11,904,660
Available-for-sale securities, Gross Unrealized Gains	224,456	296,114
Available-for-sale securities, Gross Unrealized Losses	12,468	1,787
Available-for-sale securities, Fair Value	11,231,104	12,198,987
Ginnie Mae [Member] | Agency Securities Classified as Available-for-sale [Member]	'	'
Available-for-sale securities disclosure Items [Abstract]	'	'
Available-for-sale securities, Amortized Cost Basis	2,220,035	1,614,997
Available-for-sale securities, Gross Unrealized Gains	18,384	32,298
Available-for-sale securities, Gross Unrealized Losses	4,924	176
Available-for-sale securities, Fair Value	$2,233,495	$1,647,119

DISCLOSURES_REGARDING_FAIR_VAL5

DISCLOSURES REGARDING FAIR VALUES OF FINANCIAL INSTRUMENTS - Securities in Unrealized Loss Position (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Continuous unrealized loss position, fair value [Abstract]	'	'
One year or greater	$39,030	$29,760
Less than one year	2,857,724	751,645
Continuous unrealized loss position, Fair Value, Total	2,896,754	781,405
Continuous unrealized loss position, aggregate loss [Abstract]	'	'
One year or greater	380	120
Less than one year	17,012	1,843
Unrealized Losses, Total	$17,392	$1,963

INCOME_TAXES_Schedule_of_Effec

INCOME TAXES - Schedule of Effective Income Tax Rate Reconciliation (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
INCOME TAXES [Abstract]	'	'	'
Income taxes computed at the federal statutory rate	$44,270	$57,269	$37,171
Benefit of REIT status	-44,270	-57,268	-37,183
Income taxes computed on income of Capstead's sole taxable REIT subsidiary	0	1	-12
Change in net deferred income tax assets	1	-1	22
Other	-1	0	-10
Income tax provision	$0	$0	$0

INCOME_TAXES_Narrative_Details

INCOME TAXES - Narrative (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
INCOME TAXES [Abstract]	'	'	'
Income taxes paid	$0	$0	$0

INCOME_TAXES_Components_of_Def

INCOME TAXES - Components of Deferred Tax Assets and Liabilities (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
INCOME TAXES [Abstract]	'		'
Alternative minimum tax credit	$1,942,000	[1]	$1,940,000	[1]
Net operating loss carryforwards	60,000	[2]	60,000	[2]
Other	21,000		22,000
Deferred tax assets, gross, Total	2,023,000		2,022,000
Deferred income tax liabilities	0		0
Net deferred tax assets	2,023,000		2,022,000
Valuation allowance	2,023,000	[3]	2,022,000	[3]
Operating loss carryforwards subject to expiration amount	$3,500,000		'
Operating loss carryforwards, expiration date	31-Dec-19		'
[1]	Alternative tax credit carryforwards can be utilized to offset payment of federal income taxes on future taxable income, if any, earned by this subsidiary, subject to certain limitations.
[2]	Excludes $3.5 million in remaining net operating loss carryforwards which expire beginning after 2019. To the extent these carryforwards are utilized in future periods, the benefit will reduce actual taxes payable.
[3]	Because this subsidiary is not expected to earn significant amounts of taxable income, related net deferred tax assets are fully reserved at December 31, 2013.

STOCKHOLDERS_EQUITY_Details

STOCKHOLDERS' EQUITY (Details) (USD $)

1 Months Ended

12 Months Ended

12 Months Ended

1 Months Ended

12 Months Ended

Jan. 31, 2013

Oct. 30, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

31-May-13

Dec. 31, 2013

Jun. 30, 2013

Jun. 30, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Cumulative Redeemable Preferred Stock, Series E [Member]

Cumulative Redeemable Preferred Stock, Series E [Member]

Series A And Series B Preferred Stock [Member]

Series A Perpetual Preferred Shares [Member]

Series B Perpetual Preferred Share [Member]

Series B Perpetual Preferred Share [Member]

Series B Perpetual Preferred Share [Member]

Continuous Offering Program [Member]

Continuous Offering Program [Member]

Continuous Offering Program [Member]

Directors And Employees [Member]

Directors And Employees [Member]

Directors And Employees [Member]

Cumulative Redeemable Preferred Stock, Series E [Member]

Stockholders' Equity [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Redeemable preferred stock, shares issued (in shares)

'

'

'

'

'

'

6,800,000

'

'

'

'

'

'

'

'

'

'

'

Redeemable preferred stock, face value

'

'

'

'

'

'

$170,000,000

'

'

'

'

'

'

'

'

'

'

'

Preferred stock dividend rate (in hundredths)

'

'

'

'

'

7.50%

'

'

'

'

'

'

'

'

'

'

'

'

Redeemable preferred stock, liquidation preference per share (in dollars per share)

'

'

'

'

'

'

$25

'

'

'

'

'

'

'

'

'

'

'

Preferred stock, redemption price per share (in dollars per share)

'

'

'

'

'

'

$25

'

'

'

'

'

'

'

'

'

'

'

Proceeds from issuance of redeemable preferred stock

'

'

'

'

'

164,300,000

'

'

'

'

'

'

'

'

1,400,000

'

'

'

Cash on hand paid to redeem preferred stock

'

'

'

'

'

42,700,000

'

'

'

'

'

'

'

'

'

'

'

'

Preferred stock, redemption date

'

'

'

'

'

'

'

13-Jun-13

'

'

'

'

'

'

'

'

'

'

Preferred stock, redemption shares (in shares)

'

'

'

'

'

'

'

'

77,000

16,500,000

'

'

'

'

'

'

'

'

Preferred stock, shares outstanding (in shares)

'

'

'

'

'

'

'

'

109,000

32,000

'

'

'

'

'

'

'

'

Common stock, shares, issued on conversion of preferred stock (in shares)

'

'

'

'

'

'

'

'

181,000

20,000

'

'

'

'

'

'

'

'

Cash used for redemption of preferred stock

'

'

'

'

'

'

'

207,000,000

'

'

'

'

'

'

'

'

'

'

Redemption preference premiums paid

'

'

19,924,000

[1]

0

[1]

0

[1]

'

'

19,900,000

'

'

'

'

'

'

'

'

'

'

Reduction in income per share (in dollars per share)

'

'

'

'

'

'

'

$0.21

'

'

'

'

'

'

'

'

'

'

Proceeds from issuance of common stock

'

'

0

142,035,000

231,674,000

'

'

'

'

'

'

'

142,000,000

231,700,000

'

'

'

'

Additional shares issued (in shares)

'

'

'

'

'

'

'

'

'

'

309,000

365,000

10,500,000

17,800,000

61,000

'

'

'

Proceeds from issuance of preferred equity capital

'

'

165,756,000

4,479,000

5,206,000

'

'

'

'

'

4,500,000

5,200,000

'

'

'

'

'

'

Common stock repurchase program

'

100,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Shares repurchased (in shares)

638,000

'

'

3,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Average cost per share (in dollars per share)

$11.43

'

'

$11.80

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Value of stock repurchased

7,300,000

'

'

35,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Additions to common equity capital related to equity-based awards

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$1,800,000

$4,400,000

$3,200,000

[1]

The Series A and Series B preferred shares were redeemed on June 13, 2013 (See NOTE 11).

COMPENSATION_PROGRAMS_Schedule

COMPENSATION PROGRAMS - Schedule of Dividend Equivalent Rights (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share Based Compensation Arrangement By Dividend Equivalent Rights [Line Items]	'	'	'
Total DER's Granted	654,000	'	'
Related compensation costs	$811,000	$914,000	$960,000
July 2008 [Member]	'	'	'
Share Based Compensation Arrangement By Dividend Equivalent Rights [Line Items]	'	'	'
Total DER's Granted	225,000	'	'
Related compensation costs	279,000	335,000	396,000
July 2009 [Member]	'	'	'
Share Based Compensation Arrangement By Dividend Equivalent Rights [Line Items]	'	'	'
Total DER's Granted	225,000	'	'
Related compensation costs	279,000	335,000	396,000
July 2010 [Member]	'	'	'
Share Based Compensation Arrangement By Dividend Equivalent Rights [Line Items]	'	'	'
Total DER's Granted	60,000	'	'
Related compensation costs	75,000	89,000	105,000
August 2011 [Member]	'	'	'
Share Based Compensation Arrangement By Dividend Equivalent Rights [Line Items]	'	'	'
Total DER's Granted	72,000	'	'
Related compensation costs	89,000	107,000	63,000
July 2012 [Member]	'	'	'
Share Based Compensation Arrangement By Dividend Equivalent Rights [Line Items]	'	'	'
Total DER's Granted	72,000	'	'
Related compensation costs	$89,000	$48,000	$0
July 2013 [Member]	'	'	'
Share Based Compensation Arrangement By Dividend Equivalent Rights [Line Items]	'	'	'
Total DER's Granted	0	'	'

COMPENSATION_PROGRAMS_Other_Co

COMPENSATION PROGRAMS - Other Compensation Programs (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share Based Compensation Programs [Line Items]	'	'	'
Expiration date of grant	1-Jul-15	'	'
Incentive compensation award per share value (in dollars per share)	$12.64	'	'
Annual Incentive Compensation [Member]	'	'	'
Share Based Compensation Programs [Line Items]	'	'	'
Short term incentive compensation accruals in Accounts payable	$2,800,000	'	'
Short term incentive compensation accruals in Accrued expenses for non-participating employees	350,000	'	'
Annual Incentive Compensation [Member] | Executive Officer [Member]	'	'	'
Share Based Compensation Programs [Line Items]	'	'	'
Incentive compensation award to executive officers (in shares)	'	156,251	189,283
Incentive compensation award per share value (in dollars per share)	'	$11.47	$12.60
Stock Options [Member]	'	'	'
Share Based Compensation Programs [Line Items]	'	'	'
Share awards contractual term	'10 years	'	'
Exercisable option awards outstanding (in shares)	77,500	'	'
Options exercisable, weighted average remaining contractual term	'3 years 7 months 6 days	'	'
Options exercisable, weighted average exercise price (in dollars per share)	$11.75	'	'
Options exercisable, intrinsic value	65,000	'	'
Intrinsic value of option awards exercised	$26,000	$620,000	$129,000
Long-Term Equity-Based Awards [Member]	'	'	'
Share Based Compensation Programs [Line Items]	'	'	'
Percentage of investment capital, maximum (in hundredths)	8.00%	'	'
Spread over ten year Us treasury rate (in hundredths)	2.00%	'	'
Share awards vesting period	'3 years	'	'

COMPENSATION_PROGRAMS_Schedule1

COMPENSATION PROGRAMS - Schedule of Restricted Stock Awards (Details) (USD $)

12 Months Ended

1 Months Ended

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Jan. 31, 2013

Feb. 29, 2012

Jan. 31, 2014

Jan. 31, 2013

Jan. 31, 2014

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Year 2007 [Member]

Year 2007 [Member]

Year 2007 [Member]

Year 2008 [Member]

Year 2008 [Member]

Year 2008 [Member]

Year 2009 [Member]

Year 2009 [Member]

Year 2009 [Member]

Year 2010 [Member]

Year 2010 [Member]

Year 2010 [Member]

Year 2011 [Member]

Year 2011 [Member]

Year 2011 [Member]

Year 2012 [Member]

Year 2012 [Member]

Year 2012 [Member]

Year 2013 One [Member]

Year 2013 One [Member]

Year 2013 One [Member]

Year 2013 Two [Member]

Year 2013 Two [Member]

Year 2013 Two [Member]

Performance-Based Stock Awards [Member]

Performance-Based Stock Awards [Member]

Performance-Based Stock Awards [Member]

Performance-Based Stock Awards [Member]

Performance-Based Stock Awards [Member]

Service-Based Stock Awards [Member]

Service-Based Stock Awards [Member]

Service-Based Stock Awards [Member]

Service-Based Stock Awards [Member]

Service-Based Stock Awards [Member]

Service-Based Stock Awards [Member]

Service-Based Stock Awards [Member]

Service-Based Stock Awards [Member]

Service-Based Stock Awards [Member]

Service-Based Stock Awards [Member]

Service-Based Stock Awards [Member]

Service-Based Stock Awards [Member]

Service-Based Stock Awards [Member]

Service-Based Stock Awards [Member]

Service-Based Stock Awards [Member]

Service-Based Stock Awards [Member]

Service-Based Stock Awards [Member]

Service-Based Stock Awards [Member]

Service-Based Stock Awards [Member]

Service-Based Stock Awards [Member]

Stock Awards Activity [Member]

Stock Awards Activity [Member]

Stock Awards Activity [Member]

Performance Based Stock Awards Vesting In Three Year [Member]

Performance Based Stock Awards Vesting In Three Year [Member]

Performance Based Stock Awards Vesting In Three Year [Member]

Performance Based Stock Awards Vesting After Three Year [Member]

Stock Options [Member]

Long Term Equity Based Awards [Member]

Remaining Shares Vesting In: 2014 [Member]

Remaining Shares Vesting In: 2017 [Member]

Remaining Shares Vesting In: 2014 [Member]

Remaining Shares Vesting In: 2017 [Member]

Remaining Shares Vesting In: 2014 [Member]

Remaining Shares Vesting In: 2017 [Member]

Remaining Shares Vesting In: 2014 [Member]

Remaining Shares Vesting In: 2017 [Member]

Remaining Shares Vesting In: 2014 [Member]

Remaining Shares Vesting In: 2017 [Member]

Remaining Shares Vesting In: 2014 [Member]

Remaining Shares Vesting In: 2017 [Member]

Remaining Shares Vesting In: 2014 [Member]

Remaining Shares Vesting In: 2017 [Member]

Remaining Shares Vesting In: 2014 [Member]

Remaining Shares Vesting In: 2017 [Member]

Year 2008 [Member]

Year 2008 [Member]

Year 2009 [Member]

Year 2009 [Member]

Year 2010 [Member]

Year 2008 [Member]

Year 2008 [Member]

Year 2008 [Member]

Year 2008 [Member]

Year 2009 [Member]

Year 2009 [Member]

Year 2009 [Member]

Year 2009 [Member]

Year 2010 [Member]

Year 2010 [Member]

Year 2010 [Member]

Year 2010 [Member]

Year 2011 [Member]

Year 2011 [Member]

Year 2011 [Member]

Year 2011 [Member]

Year 2012 [Member]

Year 2012 [Member]

Year 2012 [Member]

Year 2012 [Member]

Minimum [Member]

Maximum [Member]

Remaining Shares Vesting In: 2014 [Member]

Remaining Shares Vesting In: 2015 [Member]

Remaining Shares Vesting In: 2016 [Member]

Remaining Shares Vesting In: 2014 [Member]

Remaining Shares Vesting In: 2015 [Member]

Remaining Shares Vesting In: 2016 [Member]

December 31 2017 [Member]

Remaining Shares Vesting In: 2014 [Member]

Remaining Shares Vesting In: 2015 [Member]

Remaining Shares Vesting In: 2016 [Member]

December 31 2018 [Member]

Remaining Shares Vesting In: 2014 [Member]

Remaining Shares Vesting In: 2015 [Member]

Remaining Shares Vesting In: 2016 [Member]

December 31 2019 [Member]

Remaining Shares Vesting In: 2014 [Member]

Remaining Shares Vesting In: 2015 [Member]

Remaining Shares Vesting In: 2016 [Member]

December 31 2017 [Member]

December 31 2017 [Member]

December 31 2017 [Member]

December 31 2018 [Member]

December 31 2018 [Member]

December 31 2018 [Member]

December 31 2019 [Member]

December 31 2019 [Member]

December 31 2019 [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Grant date fair value per share (in dollars per share)

'

'

'

$12.93

[1]

'

'

$12.87

[2]

'

'

$11.39

[2]

'

'

$11.64

[2]

'

'

$13.23

[2]

'

'

$13.59

[2]

'

'

$13.02

[2]

'

'

$12.34

[3]

'

'

'

'

'

'

'

$10.18

[4]

'

'

'

$14.33

[5]

'

'

'

$12.44

[6]

'

'

'

$12.72

'

'

'

$11.67

'

'

'

'

'

'

'

'

'

'

'

$12.45

Total original grants (in shares)

'

'

'

156,000

[1]

'

'

6,000

[2]

'

'

6,000

[2]

'

'

12,000

[2]

'

'

24,000

[2]

'

'

29,000

[2]

'

'

28,000

[2]

'

'

35,703

[3]

'

'

'

'

'

'

'

140,658

[4]

'

'

'

110,917

[5]

'

'

'

128,766

[6]

'

'

'

132,490

'

'

'

145,399

'

'

'

'

'

'

'

'

'

'

'

242,505

Vested (in shares)

'

'

'

121,004

[1]

'

'

6,000

[2]

'

'

6,000

[2]

'

'

12,000

[2]

'

'

24,000

[2]

'

'

29,000

[2]

'

'

0

[2]

'

'

0

[3]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Forfeited (in shares)

'

'

'

12,832

[1]

'

'

0

[2]

'

'

0

[2]

'

'

0

[2]

'

'

0

[2]

'

'

0

[2]

'

'

0

[2]

'

'

0

[3]

'

'

'

'

'

'

'

5,464

[4]

'

'

'

4,571

[5]

'

'

'

5,759

[6]

'

'

'

5,050

'

'

'

5,697

'

'

'

'

'

'

'

'

'

'

'

'

Remaining shares vesting in period (in shares)

'

'

'

'

22,164

[1]

0

[1]

'

0

[2]

0

[2]

'

0

[2]

0

[2]

'

0

[2]

0

[2]

'

0

[2]

0

[2]

'

0

[2]

0

[2]

'

28,000

[2]

0

[2]

'

0

[3]

35,703

[3]

'

'

'

'

'

'

0

[4]

0

[4]

0

[4]

'

0

[5]

0

[5]

0

[5]

'

61,499

[6]

0

[6]

0

[6]

'

63,722

63,718

0

'

0

69,853

69,849

'

'

'

'

'

'

'

'

'

Equity instruments other than options, nonvested, number of shares [Roll Forward]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unvested stock awards outstanding at beginning of period (in shares)

657,720

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

485,010

'

'

'

Grants (in shares)

63,703

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

'

'

'

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'

'

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'

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'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Vesting's (in shares)

-172,523

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

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'

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'

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'

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'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Forfeitures (in shares)

-19,969

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

'

'

'

'

'

'

'

'

'

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'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unvested stock awards outstanding at end of period (in shares)

528,931

657,720

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

'

'

'

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'

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'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

242,505

'

'

'

'

Percentage of performance based awards granted, actual (in hundredths)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

'

'

'

'

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'

'

'

'

'

'

'

'

'

50.00%

'

'

50.00%

'

'

Equity instruments other than options, nonvested, weighted average grant date fair value [Abstract]

'

'

'

'

'

'

'

'

'

'

'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unvested stock awards outstanding at beginning of period (in dollars per share)

$12.48

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Grants (in dollars per share)

$12.64

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Vestings (in dollars per share)

$12.41

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Forfeitures (in dollars per share)

$12.65

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

'

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'

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'

'

'

'

'

'

'

'

'

'

'

'

'

Unvested stock awards outstanding at end of period (in dollars per share)

$12.51

$12.48

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Salaries and benefits

$5,776,000

$5,929,000

$5,741,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

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'

'

'

'

'

'

$1,800,000

$1,900,000

$1,600,000

'

'

'

'

$3,000

'

Other general and administrative expense

'

'

'

'

'

'

'

'

'

'

'

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'

'

'

'

'

'

'

'

387,000

362,000

261,000

'

'

'

'

'

'

Common stock dividend payable

30,872,000

29,512,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

'

'

'

'

'

'

'

1,300,000

765,000

'

'

'

'

'

'

'

Total of unrecognized compensation expense for unvested stock award

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

'

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'

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'

'

'

'

'

$3,000,000

'

'

'

'

'

'

'

'

Compensation cost not yet recognized, period for recognition

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

'

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'

'

'

'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'1 year 7 months 6 days

'

'

'

'

'

'

'

'

Performance-based awards vested (in shares)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

67,595

67,599

52,915

53,431

61,508

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Expected compensation expense related to stock based compensation awards

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

625,000

5,400,000

'

'

'

Expected issuance of common stock for award program (in shares)

528,931

657,720

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

242,505

'

'

'

'

[1]

The remaining 2007 grant shares vested in January 2014.

[2]

Director stock awards have been granted annually upon election or reelection to the board of directors. These awards vest one year after issuance.

[3]

In December 2013 the Committee granted service-based awards to employees that were not awarded performance-based restricted stock units. These awards vest on January 2, 2017.

[4]

The absolute return metrics for the three-year measurement periods ending December 31, 2012 and 2011 were met resulting in the vesting of 67,595 shares associated with the second 50% of this grant in January 2013 and 67,599 shares associated with the first 50% of this grant in February 2012.

[5]

The absolute return metrics for the three-year measurement periods ending December 31, 2013 and 2012 were met resulting in the vesting of 52,915 shares associated with the second 50% of this grant in January 2014 and 53,431 shares associated with the first 50% of this grant in January 2013.

[6]

The absolute return metric for the first three-year measurement period ending December 31, 2013 was met resulting in the vesting of 61,508 shares associated with the first 50% of this grant in January 2014.

COMPENSATION_PROGRAMS_Schedule2

COMPENSATION PROGRAMS - Schedule of Stock Option Award Activity (Details) (USD $)	12 Months Ended
	Dec. 31, 2013
COMPENSATION PROGRAMS [Abstract]	'
Option awards outstanding at beginning of period (in shares)	97,500
Exercises (in shares)	-15,000
Forfeitures (in shares)	-5,000
Option awards outstanding at end of period (in shares)	77,500
Weighted Average Exercise Price, option awards outstanding at beginning of year (in dollars per share)	$11.63
Weighted Average Exercise Price, exercises (in dollars per share)	$10.61
Weighted Average Exercise Price, forfeitures (in dollars per share)	$12.87
Weighted Average Exercise Price, option awards outstanding at end of year (in dollars per share)	$11.75

COMPENSATION_PROGRAMS_Defined_

COMPENSATION PROGRAMS - Defined Contribution Plans (Details) (USD $)	12 Months Ended
	Dec. 31, 2013
Defined Contribution Plan Disclosure [Abstract]	'
Defined contribution plan voluntary contribution based on compensation (in hundredths)	50.00%
Defined contribution plan, maximum annual contributions per employee (in hundredths)	6.00%
Defined contribution plan, employer matching contribution (in hundredths)	3.00%
Defined contribution plan, cost recognized	$320,000

QUARTERLY_RESULTS_UNAUDITED_Su

QUARTERLY RESULTS (UNAUDITED) - Summarized Quarterly Results of Operations (Details) (USD $)	3 Months Ended																12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
QUARTERLY RESULTS (UNAUDITED) [Abstract]	'		'		'		'		'		'		'		'		'	'	'
Interest income on residential mortgage investments (before investment premium amortization)	$83,254		$85,674		$85,214		$86,867		$90,279		$90,614		$87,486		$84,229		'	'	'
Investment premium amortization	-24,800		-39,031		-33,642		-28,399		-29,331		-27,151		-21,699		-18,496		-125,872	-96,677	-68,077
Related interest expense	-15,392		-15,759		-16,749		-18,468		-20,672		-17,875		-16,451		-14,103		-66,368	-69,101	-57,328
Net interest income (expense)	43,062		30,884		34,823		40,000		40,276		45,588		49,336		51,630		140,355	178,781	177,298
Other interest income (expense)	-2,066	[1]	-2,074	[1]	-2,015	[1]	-2,010	[1]	-1,904	[1]	-1,968	[1]	-1,946	[1]	-1,972	[1]	'	'	'
Other revenue (expense)	-4,023		-4,108		-2,914		-3,072		-3,288		-3,583		-4,055		-4,488		-14,117	-15,414	-17,353
Net income	$36,973		$24,702		$29,894		$34,918		$35,084		$40,037		$43,335		$45,170		$126,487	$163,626	$160,204
Basic net income per common share (in dollars per share)	$0.35	[2]	$0.23	[2]	$0.04	[2]	$0.31	[2]	$0.31		$0.35		$0.40		$0.45		$0.93	$1.50	$1.76
Diluted net income per common share (in dollars per share)	$0.35	[2]	$0.23	[2]	$0.04	[2]	$0.31	[2]	$0.31		$0.35		$0.40		$0.44		$0.93	$1.50	$1.75
Redemption preference premiums paid and other one-time effects of the preferred capital transactions (in dollars per share)	'		'		$0.23		'		'		'		'		'		'	'	'
[1]	Consists principally of interest on unsecured borrowings and is presented net of earnings of related statutory trusts. These affiliates were dissolved in December 2013.
[2]	Includes $0.23 associated with redemption preference premiums paid and other one-time effects of the second quarterbs preferred capital transactions.