Derivative Instruments and Hedging Activities Commitments to Purchase Residential Mortgage Loans Held-for-Sale (Details) - USD ($)
$ in Thousands |
Sep. 30, 2016 |
Jun. 30, 2016 |
Dec. 31, 2015 |
Sep. 30, 2015 |
Jun. 30, 2015 |
Dec. 31, 2014 |
| Derivative [Line Items] |
|
|
|
|
|
|
| Derivative, Notional Amount |
$ 22,062,904
|
$ 26,141,370
|
$ 21,998,381
|
$ 28,317,580
|
$ 27,401,335
|
$ 48,115,523
|
| Loan Purchase Commitments [Member] |
|
|
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
|
|
| Derivative, Notional Amount |
61,403
|
$ 636,467
|
286,120
|
$ 501,192
|
$ 626,660
|
$ 554,838
|
| Derivative Financial Instruments, Assets [Member] |
|
|
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
|
|
| Derivative, Notional Amount |
16,759,324
|
|
21,735,997
|
|
|
|
| Derivative, Fair Value, Net |
199,013
|
|
271,509
|
|
|
|
| Derivative Financial Instruments, Assets [Member] | Loan Purchase Commitments [Member] |
|
|
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
|
|
| Derivative, Notional Amount |
46,134
|
|
98,736
|
|
|
|
| Derivative, Fair Value, Net |
310
|
|
77
|
|
|
|
| Derivative Financial Instruments, Liabilities [Member] |
|
|
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
|
|
| Derivative, Notional Amount |
9,221,580
|
|
1,362,384
|
|
|
|
| Derivative, Fair Value, Net |
(39,918)
|
|
(7,285)
|
|
|
|
| Derivative Financial Instruments, Liabilities [Member] | Loan Purchase Commitments [Member] |
|
|
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
|
|
| Derivative, Notional Amount |
15,269
|
|
187,384
|
|
|
|
| Derivative, Fair Value, Net |
$ (40)
|
|
$ (427)
|
|
|
|