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Loans - Home Loan: Risk Profile by Vintage, Geography, Lien Priority and Interest Rate Type (Detail) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 252,422 $ 245,586 $ 238,019
Consumer Portfolio Segment [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 75,564 $ 73,054  
Percentage of portfolio 100.00% 100.00%  
Consumer Portfolio Segment [Member] | Home loan      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 18,820 $ 21,584  
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Origination Year Concentration Risk      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 18,820 $ 21,584  
Percentage of portfolio 100.00% 100.00%  
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Origination Year Concentration Risk | Origination during or before 2008      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 9,497 $ 11,850  
Percentage of portfolio 50.50% 54.90%  
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 $ 898 $ 1,168  
Percentage of portfolio 4.80% 5.40%  
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 $ 1,238 $ 1,644  
Percentage of portfolio 6.60% 7.60%  
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 $ 1,392 $ 1,822  
Percentage of portfolio 7.40% 8.40%  
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 $ 919 $ 1,237  
Percentage of portfolio 4.90% 5.70%  
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 $ 450 $ 524  
Percentage of portfolio 2.40% 2.40%  
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 $ 519 $ 588  
Percentage of portfolio 2.70% 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 $ 964 $ 1,054  
Percentage of portfolio 5.10% 4.90%  
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 $ 1,670 $ 1,697  
Percentage of portfolio 8.80% 7.90%  
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Origination Year Concentration Risk | 2017      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 1,273    
Percentage of portfolio 6.80%    
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Geographic Concentration Risk      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 18,820 $ 21,584  
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 $ 4,115 $ 4,993  
Percentage of portfolio 21.90% 23.10%  
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 $ 1,985 $ 2,036  
Percentage of portfolio 10.50% 9.40%  
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Geographic Concentration Risk | Maryland      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 1,287 $ 1,409  
Percentage of portfolio 6.80% 6.60%  
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Geographic Concentration Risk | Illinois      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 1,053 $ 1,218  
Percentage of portfolio 5.60% 5.60%  
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Geographic Concentration Risk | Virginia      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 1,102 $ 1,204  
Percentage of portfolio 5.90% 5.60%  
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 $ 1,000 $ 1,112  
Percentage of portfolio 5.30% 5.20%  
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Geographic Concentration Risk | Louisiana      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 867 $ 985  
Percentage of portfolio 4.60% 4.60%  
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Geographic Concentration Risk | Florida      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 802 $ 931  
Percentage of portfolio 4.30% 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 $ 883 $ 823  
Percentage of portfolio 4.70% 3.80%  
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Geographic Concentration Risk | ARIZONA      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 728 $ 888  
Percentage of portfolio 3.90% 4.10%  
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Geographic Concentration Risk | Other      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 4,998 $ 5,985  
Percentage of portfolio 26.50% 27.70%  
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Lien Type Concentration Risk      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 18,820 $ 21,584  
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 $ 17,607 $ 20,341  
Percentage of portfolio 93.60% 94.20%  
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 $ 1,213 $ 1,243  
Percentage of portfolio 6.40% 5.80%  
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 $ 18,820 $ 21,584  
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 $ 5,378 $ 5,216  
Percentage of portfolio 28.60% 24.20%  
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 $ 13,442 $ 16,368  
Percentage of portfolio 71.40% 75.80%  
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 $ 7,390 $ 7,156  
Percentage of portfolio 39.30% 33.20%  
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Loans excluding Acquired Loans | Origination Year Concentration Risk | Origination during or before 2008      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 1,689 $ 2,166  
Percentage of portfolio 9.00% 10.00%  
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 $ 65 $ 80  
Percentage of portfolio 0.30% 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 $ 66 $ 82  
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 $ 120 $ 139  
Percentage of portfolio 0.60% 0.60%  
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 $ 727 $ 969  
Percentage of portfolio 3.90% 4.50%  
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 $ 402 $ 465  
Percentage of portfolio 2.10% 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 $ 491 $ 557  
Percentage of portfolio 2.60% 2.60%  
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 $ 936 $ 1,024  
Percentage of portfolio 5.00% 4.70%  
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 $ 1,647 $ 1,674  
Percentage of portfolio 8.70% 7.80%  
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Loans excluding Acquired Loans | Origination Year Concentration Risk | 2017      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 1,247    
Percentage of portfolio 6.70%    
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 $ 7,390 $ 7,156  
Percentage of portfolio 39.30% 33.20%  
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 $ 999 $ 976  
Percentage of portfolio 5.30% 4.50%  
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 $ 1,400 $ 1,343  
Percentage of portfolio 7.40% 6.20%  
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 $ 610 $ 585  
Percentage of portfolio 3.20% 2.70%  
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 $ 154 $ 108  
Percentage of portfolio 0.80% 0.50%  
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 $ 538 $ 490  
Percentage of portfolio 2.90% 2.30%  
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 $ 391 $ 379  
Percentage of portfolio 2.10% 1.80%  
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 $ 848 $ 962  
Percentage of portfolio 4.50% 4.50%  
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 $ 184 $ 159  
Percentage of portfolio 1.00% 0.70%  
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 $ 804 $ 725  
Percentage of portfolio 4.30% 3.40%  
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 $ 94 $ 89  
Percentage of portfolio 0.50% 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 $ 1,368 $ 1,340  
Percentage of portfolio 7.30% 6.20%  
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 $ 7,390 $ 7,156  
Percentage of portfolio 39.30% 33.20%  
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 $ 6,414 $ 6,182  
Percentage of portfolio 34.10% 28.70%  
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 $ 976 $ 974  
Percentage of portfolio 5.20% 4.50%  
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 $ 7,390 $ 7,156  
Percentage of portfolio 39.30% 33.20%  
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 $ 3,725 $ 3,394  
Percentage of portfolio 19.80% 15.80%  
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 $ 3,665 $ 3,762  
Percentage of portfolio 19.50% 17.40%  
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 $ 11,430 $ 14,428  
Percentage of portfolio 60.70% 66.80%  
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Acquired Loans | Origination Year Concentration Risk | Origination during or before 2008      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 7,808 $ 9,684  
Percentage of portfolio 41.50% 44.90%  
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 $ 833 $ 1,088  
Percentage of portfolio 4.50% 5.00%  
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 $ 1,172 $ 1,562  
Percentage of portfolio 6.20% 7.20%  
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 $ 1,272 $ 1,683  
Percentage of portfolio 6.80% 7.80%  
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 $ 192 $ 268  
Percentage of portfolio 1.00% 1.20%  
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 $ 48 $ 59  
Percentage of portfolio 0.30% 0.20%  
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 $ 28 $ 31  
Percentage of portfolio 0.10% 0.20%  
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 $ 28 $ 30  
Percentage of portfolio 0.10% 0.20%  
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 $ 23  
Percentage of portfolio 0.10% 0.10%  
Consumer Portfolio Segment [Member] | Home loan | Home Loans Receivable | Acquired Loans | Origination Year Concentration Risk | 2017      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 26    
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 $ 11,430 $ 14,428  
Percentage of portfolio 60.70% 66.80%  
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 $ 3,116 $ 4,017  
Percentage of portfolio 16.60% 18.60%  
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 $ 585 $ 693  
Percentage of portfolio 3.10% 3.20%  
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 $ 677 $ 824  
Percentage of portfolio 3.60% 3.90%  
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 $ 899 $ 1,110  
Percentage of portfolio 4.80% 5.10%  
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 $ 564 $ 714  
Percentage of portfolio 3.00% 3.30%  
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 $ 609 $ 733  
Percentage of portfolio 3.20% 3.40%  
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 $ 19 $ 23  
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 $ 618 $ 772  
Percentage of portfolio 3.30% 3.60%  
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 $ 79 $ 98  
Percentage of portfolio 0.40% 0.40%  
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 $ 634 $ 799  
Percentage of portfolio 3.40% 3.70%  
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 $ 3,630 $ 4,645  
Percentage of portfolio 19.20% 21.50%  
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 $ 11,430 $ 14,428  
Percentage of portfolio 60.70% 66.80%  
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 $ 11,193 $ 14,159  
Percentage of portfolio 59.50% 65.50%  
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 $ 237 $ 269  
Percentage of portfolio 1.20% 1.30%  
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 $ 11,430 $ 14,428  
Percentage of portfolio 60.70% 66.80%  
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 $ 1,653 $ 1,822  
Percentage of portfolio 8.80% 8.40%  
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 $ 9,777 $ 12,606  
Percentage of portfolio 51.90% 58.40%