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Fair Value of Assets & Liabilities - Summary Of Changes In Level 3 Assets And Liabilities Measured At Fair Value (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Beginning balance | $ (9,425) | $ (5,700) | $ (5,645) | $ (6,245)
Net income | (529) | (129) | (4,904) | (179)
Purchases | (28,100) | 0 | (28,100) | 0
Sales | 0 |  | 0 | 0
Settlements | 3,842 | 299 | 4,437 | 894
Net transfers into/(out of) Level 3 | 0 | 0 | 0 | 0
Ending balance | (34,212) | (5,530) | (34,212) | (5,530)
Net unrealized gains/(losses) included in net income | (530) | (129) | (4,904) | (179)
Trading securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 1,724 | 2,464 | 2,151 | 2,573
Net income | 33 | 92 | 173 | 380
Purchases | 0 | 0 | 0 | 0
Sales | 0 |  | 0 | 0
Settlements | (165) | (251) | (732) | (648)
Net transfers into/(out of) Level 3 | 0 | 0 | 0 | 0
Ending balance | 1,592 | 2,305 | 1,592 | 2,305
Net unrealized gains/(losses) included in net income | (3) | 62 | 59 | 264
Interest- only strips- AFS |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 5,787 | 1,163 | 1,270 | 0
Net income | (456) | (160) | 840 | 107
Purchases | 0 | 0 | 0 | 1,413
Sales | (2,034) |  | (11,227) | (3,291)
Settlements | 0 | 0 | 0 | 0
Net transfers into/(out of) Level 3 | 7,064 | 2,120 | 19,478 | 4,894
Ending balance | 10,361 | 3,123 | 10,361 | 3,123
Net unrealized gains/(losses) included in net income | (215) | (72) | (279) | (122)
Loans held- for-sale |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 16,718 | 20,587 | 18,926 | 21,924
Net income | 277 | 390 | 986 | 1,722
Purchases | 0 | 43 | 62 | 118
Sales | 0 |  | 0 | 0
Settlements | (759) | (939) | (3,382) | (3,340)
Net transfers into/(out of) Level 3 | 0 | 0 | (356) | (343)
Ending balance | 16,236 | 20,081 | 16,236 | 20,081
Net unrealized gains/(losses) included in net income | $ 277 | $ 390 | $ 986 | $ 1,722

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- Definition Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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