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Fair Value Measurements - Financial Instruments Classified Within Level 3 (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017
Total investment securities available for sale |  |  |
Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) |  |  |
Beginning Balance | $ 0 | $ 200 |
Ending Balance | 0 | 0 |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |
Mortgage derivative loss | 0 | 0 |
Total investment securities available for sale | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Transfer of level 3 to level 2 based on new pricing information |  | 200 |
Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) |  |  |
Transfer out of level 3 securities |  | (200) |
Derivative Financial Instruments |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |
Beginning Balance | 1,225 | 3,114 |
Mortgage derivative loss | 1,147 | (1,889) |
Ending Balance | $ 2,372 | 1,225 |
Derivative Financial Instruments | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Transfer of level 3 to level 2 based on new pricing information |  | 0 |
Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) |  |  |
Transfer out of level 3 securities |  | $ 0 |
Investment security |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Transfer of level 3 to level 2 based on new pricing information |  |  | $ 200
Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) |  |  |
Transfer out of level 3 securities |  |  | $ (200)

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- Definition Fair value of financial instrument classified as derivative asset (liability) after deduction of derivative liability (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 (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19279-110258 + Details
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