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Derivative Financial Instruments - Aggregate Fair Value and Notional Amount of Derivative Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Derivative [Line Items] |  |
Fair Value | $ (47,363) | $ (29,734)
Notional Amount | 6,644,081 | 4,980,343
Derivative Liabilities |  |
Derivative [Line Items] |  |
Fair Value | (63,081) | (66,329)
Notional Amount | 3,485,466 | 2,423,362
Derivative Assets |  |
Derivative [Line Items] |  |
Fair Value | 15,718 | 36,595
Notional Amount | 3,158,615 | 2,556,981
Interest rate agreements | Derivative Liabilities |  |
Derivative [Line Items] |  |
Fair Value | (11,888) | (12,097)
Notional Amount | 1,248,000 | 1,101,500
Interest rate agreements | Derivative Liabilities | Cash Flow Hedging |  |
Derivative [Line Items] |  |
Fair Value | (43,679) | (44,822)
Notional Amount | 139,500 | 139,500
Interest rate agreements | Derivative Assets |  |
Derivative [Line Items] |  |
Fair Value | 10,122 | 19,859
Notional Amount | 1,765,000 | 1,009,000
TBAs |  |
Derivative [Line Items] |  |
Notional Amount | 1,700,000 | 1,360,000
TBAs | Derivative Liabilities |  |
Derivative [Line Items] |  |
Fair Value | (3,808) | (4,681)
Notional Amount | 1,400,000 | 510,000
TBAs | Derivative Assets |  |
Derivative [Line Items] |  |
Fair Value | 133 | 8,300
Notional Amount | 295,000 | 850,000
Futures |  |
Derivative [Line Items] |  |
Notional Amount | 8,000 | 88,000
Futures | Derivative Liabilities |  |
Derivative [Line Items] |  |
Fair Value | 0 | (928)
Notional Amount | 0 | 87,500
Futures | Derivative Assets |  |
Derivative [Line Items] |  |
Fair Value | 1 | 0
Notional Amount | 7,500 | 0
Swaptions | Derivative Assets |  |
Derivative [Line Items] |  |
Fair Value | 42 | 5,121
Notional Amount | 200,000 | 345,000
Loan purchase commitments | Derivative Liabilities |  |
Derivative [Line Items] |  |
Fair Value | (3,706) | (3,801)
Notional Amount | 697,966 | 584,862
Loan purchase commitments | Derivative Assets |  |
Derivative [Line Items] |  |
Fair Value | 3,243 | 3,315
Notional Amount | 547,434 | 352,981
Loan forward sale commitments | Derivative Assets |  |
Derivative [Line Items] |  |
Fair Value | 2,177 | 0
Notional Amount | $ 343,681 | $ 0

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13495-108611 + Details
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