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Fair Value Recurring Changes in Fair Value (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
    
Assets [Abstract]    
Trading securities $ 16,396 $ 17,950
Available-for-sale securities 0 0
Mortgage loans held for investment, at fair value 0 0
Other assets [Abstract]    
Derivatives assets at fair value 0 0
Total assets at fair value 61,205 93,736
Other liabilities [Abstract]    
Derivative liabilities at fair value 0 0
Total liabilities at fair value 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Cash equivalents   1,150 [1]
Trading securities 16,396 17,950
Available-for-sale securities 0 0
Other assets [Abstract]    
Derivatives assets at fair value 0 0
Total assets at fair value 16,396 19,100
Liabilities [Abstract]    
Long-term debt, fair value 0 0
Other liabilities [Abstract]    
Derivative liabilities at fair value 0 0
Total liabilities at fair value 0 0
Significant Unobservable Inputs (Level 3) [Member]
    
Assets [Abstract]    
Trading securities 2,685 2,286
Available-for-sale securities 18,979 25,034
Mortgage loans held for investment, at fair value 393,817 466,594
Other assets [Abstract]    
Derivatives assets at fair value 92 175
Total assets at fair value 417,607 495,561
Other liabilities [Abstract]    
Derivative liabilities at fair value 118 161
Total liabilities at fair value 18,931 23,984
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Cash equivalents   0 [1]
Trading securities 2,685 2,286
Available-for-sale securities 18,979 25,034
Other assets [Abstract]    
Derivatives assets at fair value 92 175
Total assets at fair value 24,392 30,129
Liabilities [Abstract]    
Long-term debt, fair value 889 1,528
Other liabilities [Abstract]    
Derivative liabilities at fair value 118 161
Total liabilities at fair value 1,007 1,689
Significant Other Observable Inputs (Level 2) [Member]
    
Assets [Abstract]    
Trading securities 13,779 20,459
Available-for-sale securities 22,021 38,147
Mortgage loans held for investment, at fair value 2,617,991 2,567,022
Other assets [Abstract]    
Derivatives assets at fair value 11,202 16,051
Total assets at fair value 2,726,066 2,694,632
Other liabilities [Abstract]    
Derivative liabilities at fair value 13,152 22,590
Total liabilities at fair value 3,280,184 3,347,367
Significant Other Observable Inputs (Level 2) [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Cash equivalents   0 [1]
Trading securities 13,779 20,459
Available-for-sale securities 22,021 38,147
Other assets [Abstract]    
Derivatives assets at fair value 11,202 16,051
Total assets at fair value 58,243 82,823
Liabilities [Abstract]    
Long-term debt, fair value 14,209 10,912
Other liabilities [Abstract]    
Derivative liabilities at fair value 13,152 22,590
Total liabilities at fair value 27,361 33,502
Netting Adjustment [Member]
    
Assets [Abstract]    
Trading securities 0 0
Available-for-sale securities 0 0
Mortgage loans held for investment, at fair value 0 0
Other assets [Abstract]    
Derivatives assets at fair value (9,275) (15,791)
Total assets at fair value (9,275) (15,791)
Other liabilities [Abstract]    
Derivative liabilities at fair value (10,909) (22,046)
Total liabilities at fair value (10,909) (22,046)
Netting Adjustment [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Cash equivalents   0 [1]
Trading securities 0 0
Available-for-sale securities 0 0
Other assets [Abstract]    
Derivatives assets at fair value (9,275) [2] (15,791) [2]
Total assets at fair value (9,275) [2] (15,791) [2]
Liabilities [Abstract]    
Long-term debt, fair value 0 0
Other liabilities [Abstract]    
Derivative liabilities at fair value (10,909) [2] (22,046) [2]
Total liabilities at fair value (10,909) [2] (22,046) [2]
Estimated Fair Value [Member]
    
Assets [Abstract]    
Trading securities 32,860 40,695
Available-for-sale securities 41,000 63,181
Mortgage loans held for investment, at fair value 3,011,808 3,033,616
Other assets [Abstract]    
Derivatives assets at fair value 2,019 435
Total assets at fair value 3,195,603 3,268,138
Other liabilities [Abstract]    
Derivative liabilities at fair value 2,361 705
Total liabilities at fair value 3,288,206 3,349,305
Estimated Fair Value [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Cash equivalents   1,150 [1]
Trading securities 32,860 40,695
Available-for-sale securities 41,000 63,181
Other assets [Abstract]    
Derivatives assets at fair value 2,019 435
Total assets at fair value 89,756 116,261
Liabilities [Abstract]    
Long-term debt, fair value 15,098 12,440
Other liabilities [Abstract]    
Derivative liabilities at fair value 2,361 705
Total liabilities at fair value 17,459 13,145
Fannie Mae [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 0 0
Available-for-sale securities 0 0
Fannie Mae [Member] | Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 46 68
Available-for-sale securities 8 29
Fannie Mae [Member] | Significant Other Observable Inputs (Level 2) [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 6,035 6,180
Available-for-sale securities 7,191 10,406
Fannie Mae [Member] | Netting Adjustment [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 0 0
Available-for-sale securities 0 0
Fannie Mae [Member] | Estimated Fair Value [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 6,081 6,248
Available-for-sale securities 7,199 10,435
Freddie Mac [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 0 0
Available-for-sale securities 0 0
Freddie Mac [Member] | Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 1 2
Available-for-sale securities 9 10
Freddie Mac [Member] | Significant Other Observable Inputs (Level 2) [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 2,162 2,791
Available-for-sale securities 7,255 9,370
Freddie Mac [Member] | Netting Adjustment [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 0 0
Available-for-sale securities 0 0
Freddie Mac [Member] | Estimated Fair Value [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 2,163 2,793
Available-for-sale securities 7,264 9,380
Ginnie Mae [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 0 0
Available-for-sale securities 0 0
Ginnie Mae [Member] | Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 2 1
Available-for-sale securities 1 0
Ginnie Mae [Member] | Significant Other Observable Inputs (Level 2) [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 430 436
Available-for-sale securities 624 751
Ginnie Mae [Member] | Netting Adjustment [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 0 0
Available-for-sale securities 0 0
Ginnie Mae [Member] | Estimated Fair Value [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 432 437
Available-for-sale securities 625 751
Alt-A private-label securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 0 0
Available-for-sale securities 0 0
Alt-A private-label securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 520 104
Available-for-sale securities 3,239 6,564
Alt-A private-label securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 975 1,226
Available-for-sale securities 4,160 4,511
Alt-A private-label securities [Member] | Netting Adjustment [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 0 0
Available-for-sale securities 0 0
Alt-A private-label securities [Member] | Estimated Fair Value [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 1,495 1,330
Available-for-sale securities 7,399 11,075
Subprime private-label securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 0 0
Available-for-sale securities 0 0
Subprime private-label securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 1,411 1,319
Available-for-sale securities 6,965 7,447
Subprime private-label securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 0 0
Available-for-sale securities 0 0
Subprime private-label securities [Member] | Netting Adjustment [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 0 0
Available-for-sale securities 0 0
Subprime private-label securities [Member] | Estimated Fair Value [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 1,411 1,319
Available-for-sale securities 6,965 7,447
CMBS [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 0 0
Available-for-sale securities 0 0
CMBS [Member] | Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 0 0
Available-for-sale securities 0 0
CMBS [Member] | Significant Other Observable Inputs (Level 2) [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 4,177 9,826
Available-for-sale securities 2,783 13,097
CMBS [Member] | Netting Adjustment [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 0 0
Available-for-sale securities 0 0
CMBS [Member] | Estimated Fair Value [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 4,177 9,826
Available-for-sale securities 2,783 13,097
Mortgage revenue bonds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 0 0
Available-for-sale securities 0 0
Mortgage revenue bonds [Member] | Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 595 675
Available-for-sale securities 5,799 7,837
Mortgage revenue bonds [Member] | Significant Other Observable Inputs (Level 2) [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 0 0
Available-for-sale securities 3 5
Mortgage revenue bonds [Member] | Netting Adjustment [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 0 0
Available-for-sale securities 0 0
Mortgage revenue bonds [Member] | Estimated Fair Value [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 595 675
Available-for-sale securities 5,802 7,842
Other [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 0 0
Available-for-sale securities 0 0
Other [Member] | Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 110 117
Available-for-sale securities 2,958 3,147
Other [Member] | Significant Other Observable Inputs (Level 2) [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 0 0
Available-for-sale securities 5 7
Other [Member] | Netting Adjustment [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 0 0
Available-for-sale securities 0 0
Other [Member] | Estimated Fair Value [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 110 117
Available-for-sale securities 2,963 3,154
U.S. Treasury Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 16,396 17,950
U.S. Treasury Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 0 0
U.S. Treasury Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 0 0
U.S. Treasury Securities [Member] | Netting Adjustment [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 0 0
U.S. Treasury Securities [Member] | Estimated Fair Value [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Trading securities 16,396 17,950
Fannie Mae [Member]
    
Liabilities [Abstract]    
Long-term debt, fair value 684 793
Fannie Mae [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
    
Assets [Abstract]    
Mortgage loans held for investment, at fair value 0 0
Liabilities [Abstract]    
Long-term debt, fair value 0 0
Fannie Mae [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring Fair Value Measurements [Member]
    
Liabilities [Abstract]    
Long-term debt, fair value 0 0
Fannie Mae [Member] | Significant Unobservable Inputs (Level 3) [Member]
    
Assets [Abstract]    
Mortgage loans held for investment, at fair value 223,365 232,170
Liabilities [Abstract]    
Long-term debt, fair value 962 1,056
Fannie Mae [Member] | Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member]
    
Liabilities [Abstract]    
Long-term debt, fair value 324 400
Fannie Mae [Member] | Significant Other Observable Inputs (Level 2) [Member]
    
Assets [Abstract]    
Mortgage loans held for investment, at fair value 33,998 39,018
Liabilities [Abstract]    
Long-term debt, fair value 498,046 534,516
Fannie Mae [Member] | Significant Other Observable Inputs (Level 2) [Member] | Recurring Fair Value Measurements [Member]
    
Liabilities [Abstract]    
Long-term debt, fair value 360 393
Fannie Mae [Member] | Netting Adjustment [Member]
    
Assets [Abstract]    
Mortgage loans held for investment, at fair value 0 0
Liabilities [Abstract]    
Long-term debt, fair value 0 0
Fannie Mae [Member] | Netting Adjustment [Member] | Recurring Fair Value Measurements [Member]
    
Liabilities [Abstract]    
Long-term debt, fair value 0 0
Fannie Mae [Member] | Estimated Fair Value [Member]
    
Assets [Abstract]    
Mortgage loans held for investment, at fair value 257,363 271,188
Liabilities [Abstract]    
Long-term debt, fair value 499,008 535,572
Fannie Mae [Member] | Estimated Fair Value [Member] | Recurring Fair Value Measurements [Member]
    
Liabilities [Abstract]    
Long-term debt, fair value 684 793
Consolidated Trusts [Member]
    
Assets [Abstract]    
Mortgage loans held for investment, at fair value 13,877 10,800
Liabilities [Abstract]    
Long-term debt, fair value 14,414 11,647
Consolidated Trusts [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
    
Assets [Abstract]    
Mortgage loans held for investment, at fair value 0 0
Liabilities [Abstract]    
Long-term debt, fair value 0 0
Consolidated Trusts [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Mortgage loans held for investment, at fair value 0 0
Liabilities [Abstract]    
Long-term debt, fair value 0 0
Consolidated Trusts [Member] | Significant Unobservable Inputs (Level 3) [Member]
    
Assets [Abstract]    
Mortgage loans held for investment, at fair value 170,452 234,424
Liabilities [Abstract]    
Long-term debt, fair value 13,082 16,171
Consolidated Trusts [Member] | Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Mortgage loans held for investment, at fair value 2,636 2,634
Liabilities [Abstract]    
Long-term debt, fair value 565 1,128
Consolidated Trusts [Member] | Significant Other Observable Inputs (Level 2) [Member]
    
Assets [Abstract]    
Mortgage loans held for investment, at fair value 2,583,993 2,528,004
Liabilities [Abstract]    
Long-term debt, fair value 2,691,156 2,685,008
Consolidated Trusts [Member] | Significant Other Observable Inputs (Level 2) [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Mortgage loans held for investment, at fair value 11,241 8,166
Liabilities [Abstract]    
Long-term debt, fair value 13,849 10,519
Consolidated Trusts [Member] | Netting Adjustment [Member]
    
Assets [Abstract]    
Mortgage loans held for investment, at fair value 0 0
Liabilities [Abstract]    
Long-term debt, fair value 0 0
Consolidated Trusts [Member] | Netting Adjustment [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Mortgage loans held for investment, at fair value 0 0
Liabilities [Abstract]    
Long-term debt, fair value 0 0
Consolidated Trusts [Member] | Estimated Fair Value [Member]
    
Assets [Abstract]    
Mortgage loans held for investment, at fair value 2,754,445 2,762,428
Liabilities [Abstract]    
Long-term debt, fair value 2,704,238 2,701,179
Consolidated Trusts [Member] | Estimated Fair Value [Member] | Recurring Fair Value Measurements [Member]
    
Assets [Abstract]    
Mortgage loans held for investment, at fair value 13,877 10,800
Liabilities [Abstract]    
Long-term debt, fair value 14,414 11,647
Swaps [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring Fair Value Measurements [Member]
    
Other assets [Abstract]    
Derivatives assets at fair value 0 0
Other liabilities [Abstract]    
Derivative liabilities at fair value 0 0
Swaps [Member] | Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member]
    
Other assets [Abstract]    
Derivatives assets at fair value 60 146
Other liabilities [Abstract]    
Derivative liabilities at fair value 115 154
Swaps [Member] | Significant Other Observable Inputs (Level 2) [Member] | Recurring Fair Value Measurements [Member]
    
Other assets [Abstract]    
Derivatives assets at fair value 9,434 12,224
Other liabilities [Abstract]    
Derivative liabilities at fair value 10,992 19,836
Swaps [Member] | Netting Adjustment [Member] | Recurring Fair Value Measurements [Member]
    
Other assets [Abstract]    
Derivatives assets at fair value 0 0
Other liabilities [Abstract]    
Derivative liabilities at fair value 0 0
Swaps [Member] | Estimated Fair Value [Member] | Recurring Fair Value Measurements [Member]
    
Other assets [Abstract]    
Derivatives assets at fair value 9,494 12,370
Other liabilities [Abstract]    
Derivative liabilities at fair value 11,107 19,990
Swaptions [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring Fair Value Measurements [Member]
    
Other assets [Abstract]    
Derivatives assets at fair value 0 0
Other liabilities [Abstract]    
Derivative liabilities at fair value 0 0
Swaptions [Member] | Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member]
    
Other assets [Abstract]    
Derivatives assets at fair value 0 0
Other liabilities [Abstract]    
Derivative liabilities at fair value 0 0
Swaptions [Member] | Significant Other Observable Inputs (Level 2) [Member] | Recurring Fair Value Measurements [Member]
    
Other assets [Abstract]    
Derivatives assets at fair value 1,164 3,674
Other liabilities [Abstract]    
Derivative liabilities at fair value 1,251 2,463
Swaptions [Member] | Netting Adjustment [Member] | Recurring Fair Value Measurements [Member]
    
Other assets [Abstract]    
Derivatives assets at fair value 0 0
Other liabilities [Abstract]    
Derivative liabilities at fair value 0 0
Swaptions [Member] | Estimated Fair Value [Member] | Recurring Fair Value Measurements [Member]
    
Other assets [Abstract]    
Derivatives assets at fair value 1,164 3,674
Other liabilities [Abstract]    
Derivative liabilities at fair value 1,251 2,463
Other [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring Fair Value Measurements [Member]
    
Other assets [Abstract]    
Derivatives assets at fair value 0 0
Other liabilities [Abstract]    
Derivative liabilities at fair value   0
Other [Member] | Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member]
    
Other assets [Abstract]    
Derivatives assets at fair value 27 26
Other liabilities [Abstract]    
Derivative liabilities at fair value   0
Other [Member] | Significant Other Observable Inputs (Level 2) [Member] | Recurring Fair Value Measurements [Member]
    
Other assets [Abstract]    
Derivatives assets at fair value 0 0
Other liabilities [Abstract]    
Derivative liabilities at fair value   1
Other [Member] | Netting Adjustment [Member] | Recurring Fair Value Measurements [Member]
    
Other assets [Abstract]    
Derivatives assets at fair value 0 0
Other liabilities [Abstract]    
Derivative liabilities at fair value   0
Other [Member] | Estimated Fair Value [Member] | Recurring Fair Value Measurements [Member]
    
Other assets [Abstract]    
Derivatives assets at fair value 27 26
Other liabilities [Abstract]    
Derivative liabilities at fair value   1
Mortgage commitment derivatives [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring Fair Value Measurements [Member]
    
Other assets [Abstract]    
Derivatives assets at fair value 0 0
Other liabilities [Abstract]    
Derivative liabilities at fair value 0 0
Mortgage commitment derivatives [Member] | Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member]
    
Other assets [Abstract]    
Derivatives assets at fair value 5 3
Other liabilities [Abstract]    
Derivative liabilities at fair value 3 7
Mortgage commitment derivatives [Member] | Significant Other Observable Inputs (Level 2) [Member] | Recurring Fair Value Measurements [Member]
    
Other assets [Abstract]    
Derivatives assets at fair value 604 153
Other liabilities [Abstract]    
Derivative liabilities at fair value 909 290
Mortgage commitment derivatives [Member] | Netting Adjustment [Member] | Recurring Fair Value Measurements [Member]
    
Other assets [Abstract]    
Derivatives assets at fair value 0 0
Other liabilities [Abstract]    
Derivative liabilities at fair value 0 0
Mortgage commitment derivatives [Member] | Estimated Fair Value [Member] | Recurring Fair Value Measurements [Member]
    
Other assets [Abstract]    
Derivatives assets at fair value 609 156
Other liabilities [Abstract]    
Derivative liabilities at fair value 912 297
Netting adjustment [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring Fair Value Measurements [Member]
    
Other assets [Abstract]    
Derivatives assets at fair value 0 0
Other liabilities [Abstract]    
Derivative liabilities at fair value 0 0
Netting adjustment [Member] | Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member]
    
Other assets [Abstract]    
Derivatives assets at fair value 0 0
Other liabilities [Abstract]    
Derivative liabilities at fair value 0 0
Netting adjustment [Member] | Significant Other Observable Inputs (Level 2) [Member] | Recurring Fair Value Measurements [Member]
    
Other assets [Abstract]    
Derivatives assets at fair value 0 0
Other liabilities [Abstract]    
Derivative liabilities at fair value 0 0
Netting adjustment [Member] | Netting Adjustment [Member] | Recurring Fair Value Measurements [Member]
    
Other assets [Abstract]    
Derivatives assets at fair value (9,275) [2] (15,791) [2]
Other liabilities [Abstract]    
Derivative liabilities at fair value (10,909) [2] (22,046) [2]
Netting adjustment [Member] | Estimated Fair Value [Member] | Recurring Fair Value Measurements [Member]
    
Other assets [Abstract]    
Derivatives assets at fair value (9,275) (15,791)
Other liabilities [Abstract]    
Derivative liabilities at fair value (10,909) (22,046)
Senior Fixed [Member] | Fannie Mae [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring Fair Value Measurements [Member]
    
Liabilities [Abstract]    
Long-term debt, fair value 0 0
Senior Fixed [Member] | Fannie Mae [Member] | Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member]
    
Liabilities [Abstract]    
Long-term debt, fair value 0 0
Senior Fixed [Member] | Fannie Mae [Member] | Significant Other Observable Inputs (Level 2) [Member] | Recurring Fair Value Measurements [Member]
    
Liabilities [Abstract]    
Long-term debt, fair value 360 393
Senior Fixed [Member] | Fannie Mae [Member] | Netting Adjustment [Member] | Recurring Fair Value Measurements [Member]
    
Liabilities [Abstract]    
Long-term debt, fair value 0 0
Senior Fixed [Member] | Fannie Mae [Member] | Estimated Fair Value [Member] | Recurring Fair Value Measurements [Member]
    
Liabilities [Abstract]    
Long-term debt, fair value 360 393
Senior Floating [Member] | Fannie Mae [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring Fair Value Measurements [Member]
    
Liabilities [Abstract]    
Long-term debt, fair value 0 0
Senior Floating [Member] | Fannie Mae [Member] | Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member]
    
Liabilities [Abstract]    
Long-term debt, fair value 324 400
Senior Floating [Member] | Fannie Mae [Member] | Significant Other Observable Inputs (Level 2) [Member] | Recurring Fair Value Measurements [Member]
    
Liabilities [Abstract]    
Long-term debt, fair value 0 0
Senior Floating [Member] | Fannie Mae [Member] | Netting Adjustment [Member] | Recurring Fair Value Measurements [Member]
    
Liabilities [Abstract]    
Long-term debt, fair value 0 0
Senior Floating [Member] | Fannie Mae [Member] | Estimated Fair Value [Member] | Recurring Fair Value Measurements [Member]
    
Liabilities [Abstract]    
Long-term debt, fair value $ 324 $ 400
[1] Cash equivalents are comprised of U.S. Treasuries that are classified as Level 1.
[2] Derivative contracts are reported on a gross basis by level. The netting adjustment represents the effect of the legal right to offset under legally enforceable master netting agreements to settle with the same counterparty on a net basis, including cash collateral posted and received.