Loans - Home Loan: Risk Profile by Vintage, Geography, Lien Priority and Interest Rate Type (Detail) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 227,613	$ 229,851	$ 203,978
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 70,591	$ 70,372
Percentage of portfolio	100.00%	100.00%
Consumer Portfolio Segment [Member] | Home loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 24,343	$ 25,227
Consumer Portfolio Segment [Member] | Home loan | Origination Year Concentration Risk | Home Loans Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 24,343	$ 25,227
Percentage of portfolio	100.00%	100.00%
Consumer Portfolio Segment [Member] | Home loan | Origination Year Concentration Risk | Home Loans Receivable | Origination during or before 2007
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 11,062	$ 11,515
Percentage of portfolio	45.40%	45.60%
Consumer Portfolio Segment [Member] | Home loan | Origination Year Concentration Risk | Home Loans Receivable | 2008
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 2,894	$ 3,023
Percentage of portfolio	11.90%	12.00%
Consumer Portfolio Segment [Member] | Home loan | Origination Year Concentration Risk | Home Loans Receivable | 2009
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 1,499	$ 1,595
Percentage of portfolio	6.20%	6.30%
Consumer Portfolio Segment [Member] | Home loan | Origination Year Concentration Risk | Home Loans Receivable | 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 2,149	$ 2,305
Percentage of portfolio	8.80%	9.20%
Consumer Portfolio Segment [Member] | Home loan | Origination Year Concentration Risk | Home Loans Receivable | 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 2,459	$ 2,652
Percentage of portfolio	10.10%	10.50%
Consumer Portfolio Segment [Member] | Home loan | Origination Year Concentration Risk | Home Loans Receivable | 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 1,581	$ 1,665
Percentage of portfolio	6.50%	6.60%
Consumer Portfolio Segment [Member] | Home loan | Origination Year Concentration Risk | Home Loans Receivable | 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 608	$ 628
Percentage of portfolio	2.50%	2.50%
Consumer Portfolio Segment [Member] | Home loan | Origination Year Concentration Risk | Home Loans Receivable | 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 693	$ 711
Percentage of portfolio	2.80%	2.80%
Consumer Portfolio Segment [Member] | Home loan | Origination Year Concentration Risk | Home Loans Receivable | 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 1,153	$ 1,133
Percentage of portfolio	4.80%	4.50%
Consumer Portfolio Segment [Member] | Home loan | Origination Year Concentration Risk | Home Loans Receivable | 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 245
Percentage of portfolio	1.00%
Consumer Portfolio Segment [Member] | Home loan | Geographic Concentration Risk | Home Loans Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 24,343	$ 25,227
Percentage of portfolio	100.00%	100.00%
Consumer Portfolio Segment [Member] | Home loan | Geographic Concentration Risk | Home Loans Receivable | California
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 5,652	$ 5,884
Percentage of portfolio	23.20%	23.40%
Consumer Portfolio Segment [Member] | Home loan | Geographic Concentration Risk | Home Loans Receivable | New York
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 2,119	$ 2,171
Percentage of portfolio	8.70%	8.60%
Consumer Portfolio Segment [Member] | Home loan | Geographic Concentration Risk | Home Loans Receivable | Maryland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 1,517	$ 1,539
Percentage of portfolio	6.20%	6.10%
Consumer Portfolio Segment [Member] | Home loan | Geographic Concentration Risk | Home Loans Receivable | Illinois
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 1,433	$ 1,490
Percentage of portfolio	5.90%	5.90%
Consumer Portfolio Segment [Member] | Home loan | Geographic Concentration Risk | Home Loans Receivable | Virginia
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 1,320	$ 1,354
Percentage of portfolio	5.40%	5.40%
Consumer Portfolio Segment [Member] | Home loan | Geographic Concentration Risk | Home Loans Receivable | New Jersey
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 1,246	$ 1,293
Percentage of portfolio	5.10%	5.10%
Consumer Portfolio Segment [Member] | Home loan | Geographic Concentration Risk | Home Loans Receivable | Florida
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 1,090	$ 1,146
Percentage of portfolio	4.50%	4.50%
Consumer Portfolio Segment [Member] | Home loan | Geographic Concentration Risk | Home Loans Receivable | Louisiana
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 1,069	$ 1,096
Percentage of portfolio	4.40%	4.30%
Consumer Portfolio Segment [Member] | Home loan | Geographic Concentration Risk | Home Loans Receivable | ARIZONA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 1,041	$ 1,076
Percentage of portfolio	4.30%	4.30%
Consumer Portfolio Segment [Member] | Home loan | Geographic Concentration Risk | Home Loans Receivable | Washington
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 868	$ 919
Percentage of portfolio	3.60%	3.60%
Consumer Portfolio Segment [Member] | Home loan | Geographic Concentration Risk | Home Loans Receivable | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 6,988	$ 7,259
Percentage of portfolio	28.70%	28.80%
Consumer Portfolio Segment [Member] | Home loan | Lien Type Concentration Risk | Home Loans Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 24,343	$ 25,227
Percentage of portfolio	100.00%	100.00%
Consumer Portfolio Segment [Member] | Home loan | Lien Type Concentration Risk | Home Loans Receivable | 1st lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 23,041	$ 23,912
Percentage of portfolio	94.70%	94.80%
Consumer Portfolio Segment [Member] | Home loan | Lien Type Concentration Risk | Home Loans Receivable | 2nd lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 1,302	$ 1,315
Percentage of portfolio	5.30%	5.20%
Consumer Portfolio Segment [Member] | Home loan | Interest Rate Type Concentration Risk | Home Loans Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 24,343	$ 25,227
Percentage of portfolio	100.00%	100.00%
Consumer Portfolio Segment [Member] | Home loan | Interest Rate Type Concentration Risk | Home Loans Receivable | Fixed rate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 4,988	$ 5,015
Percentage of portfolio	20.50%	19.90%
Consumer Portfolio Segment [Member] | Home loan | Interest Rate Type Concentration Risk | Home Loans Receivable | Adjustable rate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 19,355	$ 20,212
Percentage of portfolio	79.50%	80.10%
Consumer Portfolio Segment [Member] | Home loan | Loans excluding Acquired Loans | Origination Year Concentration Risk | Home Loans Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 6,739	$ 6,700
Percentage of portfolio	27.70%	26.60%
Consumer Portfolio Segment [Member] | Home loan | Loans excluding Acquired Loans | Origination Year Concentration Risk | Home Loans Receivable | Origination during or before 2007
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 2,449	$ 2,559
Percentage of portfolio	10.10%	10.10%
Consumer Portfolio Segment [Member] | Home loan | Loans excluding Acquired Loans | Origination Year Concentration Risk | Home Loans Receivable | 2008
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 151	$ 157
Percentage of portfolio	0.60%	0.60%
Consumer Portfolio Segment [Member] | Home loan | Loans excluding Acquired Loans | Origination Year Concentration Risk | Home Loans Receivable | 2009
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 94	$ 97
Percentage of portfolio	0.40%	0.40%
Consumer Portfolio Segment [Member] | Home loan | Loans excluding Acquired Loans | Origination Year Concentration Risk | Home Loans Receivable | 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 95	$ 97
Percentage of portfolio	0.40%	0.40%
Consumer Portfolio Segment [Member] | Home loan | Loans excluding Acquired Loans | Origination Year Concentration Risk | Home Loans Receivable | 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 168	$ 176
Percentage of portfolio	0.70%	0.70%
Consumer Portfolio Segment [Member] | Home loan | Loans excluding Acquired Loans | Origination Year Concentration Risk | Home Loans Receivable | 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 1,219	$ 1,276
Percentage of portfolio	5.00%	5.10%
Consumer Portfolio Segment [Member] | Home loan | Loans excluding Acquired Loans | Origination Year Concentration Risk | Home Loans Receivable | 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 538	$ 557
Percentage of portfolio	2.20%	2.20%
Consumer Portfolio Segment [Member] | Home loan | Loans excluding Acquired Loans | Origination Year Concentration Risk | Home Loans Receivable | 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 663	$ 680
Percentage of portfolio	2.70%	2.70%
Consumer Portfolio Segment [Member] | Home loan | Loans excluding Acquired Loans | Origination Year Concentration Risk | Home Loans Receivable | 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 1,121	$ 1,101
Percentage of portfolio	4.60%	4.40%
Consumer Portfolio Segment [Member] | Home loan | Loans excluding Acquired Loans | Origination Year Concentration Risk | Home Loans Receivable | 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 241
Percentage of portfolio	1.00%
Consumer Portfolio Segment [Member] | Home loan | Loans excluding Acquired Loans | Geographic Concentration Risk | Home Loans Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 6,739	$ 6,700
Percentage of portfolio	27.70%	26.60%
Consumer Portfolio Segment [Member] | Home loan | Loans excluding Acquired Loans | Geographic Concentration Risk | Home Loans Receivable | California
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 876	$ 871
Percentage of portfolio	3.60%	3.50%
Consumer Portfolio Segment [Member] | Home loan | Loans excluding Acquired Loans | Geographic Concentration Risk | Home Loans Receivable | New York
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 1,288	$ 1,295
Percentage of portfolio	5.30%	5.10%
Consumer Portfolio Segment [Member] | Home loan | Loans excluding Acquired Loans | Geographic Concentration Risk | Home Loans Receivable | Maryland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 530	$ 511
Percentage of portfolio	2.20%	2.00%
Consumer Portfolio Segment [Member] | Home loan | Loans excluding Acquired Loans | Geographic Concentration Risk | Home Loans Receivable | Illinois
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 90	$ 89
Percentage of portfolio	0.40%	0.40%
Consumer Portfolio Segment [Member] | Home loan | Loans excluding Acquired Loans | Geographic Concentration Risk | Home Loans Receivable | Virginia
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 439	$ 428
Percentage of portfolio	1.80%	1.70%
Consumer Portfolio Segment [Member] | Home loan | Loans excluding Acquired Loans | Geographic Concentration Risk | Home Loans Receivable | New Jersey
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 354	$ 353
Percentage of portfolio	1.40%	1.40%
Consumer Portfolio Segment [Member] | Home loan | Loans excluding Acquired Loans | Geographic Concentration Risk | Home Loans Receivable | Florida
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 153	$ 157
Percentage of portfolio	0.60%	0.60%
Consumer Portfolio Segment [Member] | Home loan | Loans excluding Acquired Loans | Geographic Concentration Risk | Home Loans Receivable | Louisiana
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 1,043	$ 1,069
Percentage of portfolio	4.30%	4.20%
Consumer Portfolio Segment [Member] | Home loan | Loans excluding Acquired Loans | Geographic Concentration Risk | Home Loans Receivable | ARIZONA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 83	$ 81
Percentage of portfolio	0.30%	0.40%
Consumer Portfolio Segment [Member] | Home loan | Loans excluding Acquired Loans | Geographic Concentration Risk | Home Loans Receivable | Washington
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 115	$ 113
Percentage of portfolio	0.50%	0.40%
Consumer Portfolio Segment [Member] | Home loan | Loans excluding Acquired Loans | Geographic Concentration Risk | Home Loans Receivable | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 1,768	$ 1,733
Percentage of portfolio	7.30%	6.90%
Consumer Portfolio Segment [Member] | Home loan | Loans excluding Acquired Loans | Lien Type Concentration Risk | Home Loans Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 6,739	$ 6,700
Percentage of portfolio	27.70%	26.60%
Consumer Portfolio Segment [Member] | Home loan | Loans excluding Acquired Loans | Lien Type Concentration Risk | Home Loans Receivable | 1st lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 5,747	$ 5,705
Percentage of portfolio	23.60%	22.60%
Consumer Portfolio Segment [Member] | Home loan | Loans excluding Acquired Loans | Lien Type Concentration Risk | Home Loans Receivable | 2nd lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 992	$ 995
Percentage of portfolio	4.10%	4.00%
Consumer Portfolio Segment [Member] | Home loan | Loans excluding Acquired Loans | Interest Rate Type Concentration Risk | Home Loans Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 6,739	$ 6,700
Percentage of portfolio	27.70%	26.60%
Consumer Portfolio Segment [Member] | Home loan | Loans excluding Acquired Loans | Interest Rate Type Concentration Risk | Home Loans Receivable | Fixed rate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 2,835	$ 2,751
Percentage of portfolio	11.70%	10.90%
Consumer Portfolio Segment [Member] | Home loan | Loans excluding Acquired Loans | Interest Rate Type Concentration Risk | Home Loans Receivable | Adjustable rate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 3,904	$ 3,949
Percentage of portfolio	16.00%	15.70%
Consumer Portfolio Segment [Member] | Home loan | Acquired Loans | Origination Year Concentration Risk | Home Loans Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 17,604	$ 18,527
Percentage of portfolio	72.30%	73.40%
Consumer Portfolio Segment [Member] | Home loan | Acquired Loans | Origination Year Concentration Risk | Home Loans Receivable | Origination during or before 2007
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 8,613	$ 8,956
Percentage of portfolio	35.30%	35.50%
Consumer Portfolio Segment [Member] | Home loan | Acquired Loans | Origination Year Concentration Risk | Home Loans Receivable | 2008
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 2,743	$ 2,866
Percentage of portfolio	11.30%	11.40%
Consumer Portfolio Segment [Member] | Home loan | Acquired Loans | Origination Year Concentration Risk | Home Loans Receivable | 2009
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 1,405	$ 1,498
Percentage of portfolio	5.80%	5.90%
Consumer Portfolio Segment [Member] | Home loan | Acquired Loans | Origination Year Concentration Risk | Home Loans Receivable | 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 2,054	$ 2,208
Percentage of portfolio	8.40%	8.80%
Consumer Portfolio Segment [Member] | Home loan | Acquired Loans | Origination Year Concentration Risk | Home Loans Receivable | 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 2,291	$ 2,476
Percentage of portfolio	9.40%	9.80%
Consumer Portfolio Segment [Member] | Home loan | Acquired Loans | Origination Year Concentration Risk | Home Loans Receivable | 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 362	$ 389
Percentage of portfolio	1.50%	1.50%
Consumer Portfolio Segment [Member] | Home loan | Acquired Loans | Origination Year Concentration Risk | Home Loans Receivable | 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 70	$ 71
Percentage of portfolio	0.30%	0.30%
Consumer Portfolio Segment [Member] | Home loan | Acquired Loans | Origination Year Concentration Risk | Home Loans Receivable | 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 30	$ 31
Percentage of portfolio	0.10%	0.10%
Consumer Portfolio Segment [Member] | Home loan | Acquired Loans | Origination Year Concentration Risk | Home Loans Receivable | 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 32	$ 32
Percentage of portfolio	0.20%	0.10%
Consumer Portfolio Segment [Member] | Home loan | Acquired Loans | Origination Year Concentration Risk | Home Loans Receivable | 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 4
Percentage of portfolio	0.00%
Consumer Portfolio Segment [Member] | Home loan | Acquired Loans | Geographic Concentration Risk | Home Loans Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 17,604	$ 18,527
Percentage of portfolio	72.30%	73.40%
Consumer Portfolio Segment [Member] | Home loan | Acquired Loans | Geographic Concentration Risk | Home Loans Receivable | California
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 4,776	$ 5,013
Percentage of portfolio	19.60%	19.90%
Consumer Portfolio Segment [Member] | Home loan | Acquired Loans | Geographic Concentration Risk | Home Loans Receivable | New York
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 831	$ 876
Percentage of portfolio	3.40%	3.50%
Consumer Portfolio Segment [Member] | Home loan | Acquired Loans | Geographic Concentration Risk | Home Loans Receivable | Maryland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 987	$ 1,028
Percentage of portfolio	4.00%	4.10%
Consumer Portfolio Segment [Member] | Home loan | Acquired Loans | Geographic Concentration Risk | Home Loans Receivable | Illinois
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 1,343	$ 1,401
Percentage of portfolio	5.50%	5.50%
Consumer Portfolio Segment [Member] | Home loan | Acquired Loans | Geographic Concentration Risk | Home Loans Receivable | Virginia
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 881	$ 926
Percentage of portfolio	3.60%	3.70%
Consumer Portfolio Segment [Member] | Home loan | Acquired Loans | Geographic Concentration Risk | Home Loans Receivable | New Jersey
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 892	$ 940
Percentage of portfolio	3.70%	3.70%
Consumer Portfolio Segment [Member] | Home loan | Acquired Loans | Geographic Concentration Risk | Home Loans Receivable | Florida
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 937	$ 989
Percentage of portfolio	3.90%	3.90%
Consumer Portfolio Segment [Member] | Home loan | Acquired Loans | Geographic Concentration Risk | Home Loans Receivable | Louisiana
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 26	$ 27
Percentage of portfolio	0.10%	0.10%
Consumer Portfolio Segment [Member] | Home loan | Acquired Loans | Geographic Concentration Risk | Home Loans Receivable | ARIZONA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 958	$ 995
Percentage of portfolio	4.00%	3.90%
Consumer Portfolio Segment [Member] | Home loan | Acquired Loans | Geographic Concentration Risk | Home Loans Receivable | Washington
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 753	$ 806
Percentage of portfolio	3.10%	3.20%
Consumer Portfolio Segment [Member] | Home loan | Acquired Loans | Geographic Concentration Risk | Home Loans Receivable | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 5,220	$ 5,526
Percentage of portfolio	21.40%	21.90%
Consumer Portfolio Segment [Member] | Home loan | Acquired Loans | Lien Type Concentration Risk | Home Loans Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 17,604	$ 18,527
Percentage of portfolio	72.30%	73.40%
Consumer Portfolio Segment [Member] | Home loan | Acquired Loans | Lien Type Concentration Risk | Home Loans Receivable | 1st lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 17,294	$ 18,207
Percentage of portfolio	71.10%	72.20%
Consumer Portfolio Segment [Member] | Home loan | Acquired Loans | Lien Type Concentration Risk | Home Loans Receivable | 2nd lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 310	$ 320
Percentage of portfolio	1.20%	1.20%
Consumer Portfolio Segment [Member] | Home loan | Acquired Loans | Interest Rate Type Concentration Risk | Home Loans Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 17,604	$ 18,527
Percentage of portfolio	72.30%	73.40%
Consumer Portfolio Segment [Member] | Home loan | Acquired Loans | Interest Rate Type Concentration Risk | Home Loans Receivable | Fixed rate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 2,153	$ 2,264
Percentage of portfolio	8.80%	9.00%
Consumer Portfolio Segment [Member] | Home loan | Acquired Loans | Interest Rate Type Concentration Risk | Home Loans Receivable | Adjustable rate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 15,451	$ 16,263
Percentage of portfolio	63.50%	64.40%