Loans - Home Loan: Risk Profile by Vintage, Geography, Lien Priority and Interest Rate Type (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 245,586	$ 229,851	$ 208,316
Consumer Portfolio Segment [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 73,054	$ 70,372
Percentage of portfolio	100.00%	100.00%
Consumer Portfolio Segment [Member] | Home loan
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 21,584	$ 25,227
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Origination Year Concentration Risk
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 21,584	$ 25,227
Percentage of portfolio	100.00%	100.00%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Origination Year Concentration Risk | Origination during or before 2007
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 9,462	$ 11,515
Percentage of portfolio	43.80%	45.60%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Origination Year Concentration Risk | 2008
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 2,388	$ 3,023
Percentage of portfolio	11.10%	12.00%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Origination Year Concentration Risk | 2009
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 1,168	$ 1,595
Percentage of portfolio	5.40%	6.30%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Origination Year Concentration Risk | 2010
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 1,644	$ 2,305
Percentage of portfolio	7.60%	9.20%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Origination Year Concentration Risk | 2011
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 1,822	$ 2,652
Percentage of portfolio	8.40%	10.50%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Origination Year Concentration Risk | 2012
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 1,237	$ 1,665
Percentage of portfolio	5.70%	6.60%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Origination Year Concentration Risk | 2013
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 524	$ 628
Percentage of portfolio	2.40%	2.50%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Origination Year Concentration Risk | 2014
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 588	$ 711
Percentage of portfolio	2.80%	2.80%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Origination Year Concentration Risk | 2015
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 1,054	$ 1,133
Percentage of portfolio	4.90%	4.50%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Origination Year Concentration Risk | 2016
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 1,697
Percentage of portfolio	7.90%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Geographic Concentration Risk
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 21,584	$ 25,227
Percentage of portfolio	100.00%	100.00%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Geographic Concentration Risk | California
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 4,993	$ 5,884
Percentage of portfolio	23.10%	23.40%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Geographic Concentration Risk | New York
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 2,036	$ 2,171
Percentage of portfolio	9.40%	8.60%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Geographic Concentration Risk | Maryland
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 1,409	$ 1,539
Percentage of portfolio	6.60%	6.10%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Geographic Concentration Risk | Illinois
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 1,218	$ 1,490
Percentage of portfolio	5.60%	5.90%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Geographic Concentration Risk | Virginia
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 1,204	$ 1,354
Percentage of portfolio	5.60%	5.40%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Geographic Concentration Risk | New Jersey
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 1,112	$ 1,293
Percentage of portfolio	5.20%	5.10%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Geographic Concentration Risk | Louisiana
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 985	$ 1,096
Percentage of portfolio	4.60%	4.30%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Geographic Concentration Risk | Florida
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 931	$ 1,146
Percentage of portfolio	4.30%	4.50%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Geographic Concentration Risk | Arizona
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 888	$ 1,076
Percentage of portfolio	4.10%	4.30%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Geographic Concentration Risk | Texas
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 823
Percentage of portfolio	3.80%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Geographic Concentration Risk | Washington
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment		$ 919
Percentage of portfolio		3.60%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Geographic Concentration Risk | Other
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 5,985	$ 7,259
Percentage of portfolio	27.70%	28.80%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Lien Type Concentration Risk
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 21,584	$ 25,227
Percentage of portfolio	100.00%	100.00%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Lien Type Concentration Risk | 1st lien
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 20,341	$ 23,912
Percentage of portfolio	94.20%	94.80%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Lien Type Concentration Risk | 2nd lien
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 1,243	$ 1,315
Percentage of portfolio	5.80%	5.20%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Interest Rate Type Concentration Risk
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 21,584	$ 25,227
Percentage of portfolio	100.00%	100.00%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Interest Rate Type Concentration Risk | Fixed rate
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 5,216	$ 5,015
Percentage of portfolio	24.20%	19.90%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Interest Rate Type Concentration Risk | Adjustable rate
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 16,368	$ 20,212
Percentage of portfolio	75.80%	80.10%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Loans excluding Acquired Loans | Origination Year Concentration Risk
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 7,156	$ 6,700
Percentage of portfolio	33.20%	26.60%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Loans excluding Acquired Loans | Origination Year Concentration Risk | Origination during or before 2007
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 2,038	$ 2,559
Percentage of portfolio	9.40%	10.10%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Loans excluding Acquired Loans | Origination Year Concentration Risk | 2008
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 128	$ 157
Percentage of portfolio	0.60%	0.60%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Loans excluding Acquired Loans | Origination Year Concentration Risk | 2009
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 80	$ 97
Percentage of portfolio	0.40%	0.40%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Loans excluding Acquired Loans | Origination Year Concentration Risk | 2010
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 82	$ 97
Percentage of portfolio	0.40%	0.40%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Loans excluding Acquired Loans | Origination Year Concentration Risk | 2011
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 139	$ 176
Percentage of portfolio	0.60%	0.70%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Loans excluding Acquired Loans | Origination Year Concentration Risk | 2012
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 969	$ 1,276
Percentage of portfolio	4.50%	5.10%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Loans excluding Acquired Loans | Origination Year Concentration Risk | 2013
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 465	$ 557
Percentage of portfolio	2.20%	2.20%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Loans excluding Acquired Loans | Origination Year Concentration Risk | 2014
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 557	$ 680
Percentage of portfolio	2.60%	2.70%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Loans excluding Acquired Loans | Origination Year Concentration Risk | 2015
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 1,024	$ 1,101
Percentage of portfolio	4.70%	4.40%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Loans excluding Acquired Loans | Origination Year Concentration Risk | 2016
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 1,674
Percentage of portfolio	7.80%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Loans excluding Acquired Loans | Geographic Concentration Risk
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 7,156	$ 6,700
Percentage of portfolio	33.20%	26.60%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Loans excluding Acquired Loans | Geographic Concentration Risk | California
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 976	$ 871
Percentage of portfolio	4.50%	3.50%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Loans excluding Acquired Loans | Geographic Concentration Risk | New York
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 1,343	$ 1,295
Percentage of portfolio	6.20%	5.10%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Loans excluding Acquired Loans | Geographic Concentration Risk | Maryland
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 585	$ 511
Percentage of portfolio	2.70%	2.00%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Loans excluding Acquired Loans | Geographic Concentration Risk | Illinois
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 108	$ 89
Percentage of portfolio	0.50%	0.40%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Loans excluding Acquired Loans | Geographic Concentration Risk | Virginia
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 490	$ 428
Percentage of portfolio	2.30%	1.70%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Loans excluding Acquired Loans | Geographic Concentration Risk | New Jersey
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 379	$ 353
Percentage of portfolio	1.80%	1.40%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Loans excluding Acquired Loans | Geographic Concentration Risk | Louisiana
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 962	$ 1,069
Percentage of portfolio	4.50%	4.20%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Loans excluding Acquired Loans | Geographic Concentration Risk | Florida
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 159	$ 157
Percentage of portfolio	0.70%	0.60%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Loans excluding Acquired Loans | Geographic Concentration Risk | Arizona
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 89	$ 81
Percentage of portfolio	0.40%	0.40%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Loans excluding Acquired Loans | Geographic Concentration Risk | Texas
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 725
Percentage of portfolio	3.40%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Loans excluding Acquired Loans | Geographic Concentration Risk | Washington
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment		$ 113
Percentage of portfolio		0.40%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Loans excluding Acquired Loans | Geographic Concentration Risk | Other
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 1,340	$ 1,733
Percentage of portfolio	6.20%	6.90%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Loans excluding Acquired Loans | Lien Type Concentration Risk
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 7,156	$ 6,700
Percentage of portfolio	33.20%	26.60%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Loans excluding Acquired Loans | Lien Type Concentration Risk | 1st lien
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 6,182	$ 5,705
Percentage of portfolio	28.70%	22.60%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Loans excluding Acquired Loans | Lien Type Concentration Risk | 2nd lien
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 974	$ 995
Percentage of portfolio	4.50%	4.00%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Loans excluding Acquired Loans | Interest Rate Type Concentration Risk
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 7,156	$ 6,700
Percentage of portfolio	33.20%	26.60%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Loans excluding Acquired Loans | Interest Rate Type Concentration Risk | Fixed rate
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 3,394	$ 2,751
Percentage of portfolio	15.80%	10.90%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Loans excluding Acquired Loans | Interest Rate Type Concentration Risk | Adjustable rate
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 3,762	$ 3,949
Percentage of portfolio	17.40%	15.70%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Acquired Loans | Origination Year Concentration Risk
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 14,428	$ 18,527
Percentage of portfolio	66.80%	73.40%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Acquired Loans | Origination Year Concentration Risk | Origination during or before 2007
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 7,424	$ 8,956
Percentage of portfolio	34.40%	35.50%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Acquired Loans | Origination Year Concentration Risk | 2008
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 2,260	$ 2,866
Percentage of portfolio	10.50%	11.40%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Acquired Loans | Origination Year Concentration Risk | 2009
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 1,088	$ 1,498
Percentage of portfolio	5.00%	5.90%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Acquired Loans | Origination Year Concentration Risk | 2010
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 1,562	$ 2,208
Percentage of portfolio	7.20%	8.80%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Acquired Loans | Origination Year Concentration Risk | 2011
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 1,683	$ 2,476
Percentage of portfolio	7.80%	9.80%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Acquired Loans | Origination Year Concentration Risk | 2012
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 268	$ 389
Percentage of portfolio	1.20%	1.50%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Acquired Loans | Origination Year Concentration Risk | 2013
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 59	$ 71
Percentage of portfolio	0.20%	0.30%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Acquired Loans | Origination Year Concentration Risk | 2014
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 31	$ 31
Percentage of portfolio	0.20%	0.10%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Acquired Loans | Origination Year Concentration Risk | 2015
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 30	$ 32
Percentage of portfolio	0.20%	0.10%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Acquired Loans | Origination Year Concentration Risk | 2016
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 23
Percentage of portfolio	0.10%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Acquired Loans | Geographic Concentration Risk
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 14,428	$ 18,527
Percentage of portfolio	66.80%	73.40%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Acquired Loans | Geographic Concentration Risk | California
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 4,017	$ 5,013
Percentage of portfolio	18.60%	19.90%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Acquired Loans | Geographic Concentration Risk | New York
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 693	$ 876
Percentage of portfolio	3.20%	3.50%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Acquired Loans | Geographic Concentration Risk | Maryland
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 824	$ 1,028
Percentage of portfolio	3.90%	4.10%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Acquired Loans | Geographic Concentration Risk | Illinois
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 1,110	$ 1,401
Percentage of portfolio	5.10%	5.50%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Acquired Loans | Geographic Concentration Risk | Virginia
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 714	$ 926
Percentage of portfolio	3.30%	3.70%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Acquired Loans | Geographic Concentration Risk | New Jersey
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 733	$ 940
Percentage of portfolio	3.40%	3.70%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Acquired Loans | Geographic Concentration Risk | Louisiana
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 23	$ 27
Percentage of portfolio	0.10%	0.10%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Acquired Loans | Geographic Concentration Risk | Florida
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 772	$ 989
Percentage of portfolio	3.60%	3.90%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Acquired Loans | Geographic Concentration Risk | Arizona
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 799	$ 995
Percentage of portfolio	3.70%	3.90%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Acquired Loans | Geographic Concentration Risk | Texas
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 98
Percentage of portfolio	0.40%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Acquired Loans | Geographic Concentration Risk | Washington
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment		$ 806
Percentage of portfolio		3.20%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Acquired Loans | Geographic Concentration Risk | Other
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 4,645	$ 5,526
Percentage of portfolio	21.50%	21.90%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Acquired Loans | Lien Type Concentration Risk
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 14,428	$ 18,527
Percentage of portfolio	66.80%	73.40%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Acquired Loans | Lien Type Concentration Risk | 1st lien
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 14,159	$ 18,207
Percentage of portfolio	65.50%	72.20%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Acquired Loans | Lien Type Concentration Risk | 2nd lien
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 269	$ 320
Percentage of portfolio	1.30%	1.20%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Acquired Loans | Interest Rate Type Concentration Risk
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 14,428	$ 18,527
Percentage of portfolio	66.80%	73.40%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Acquired Loans | Interest Rate Type Concentration Risk | Fixed rate
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 1,822	$ 2,264
Percentage of portfolio	8.40%	9.00%
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Acquired Loans | Interest Rate Type Concentration Risk | Adjustable rate
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment	$ 12,606	$ 16,263
Percentage of portfolio	58.40%	64.40%