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Fair Value Measurements (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Fair value measurements |  |  |
Fair value carrying amount |  | $ 8,626 | $ 13,123
Mortgages held for sale reported at fair value |  |  |
Fair value measurements |  |  |
Fair value carrying amount |  | 8,626 | 13,123
Aggregate unpaid principal |  | 8,611 | 12,967
Excess of fair value carrying amount over (under) unpaid principal | [1] | $ 15 | $ 156
[1] | The excess of fair value carrying amount over (under) unpaid principal is included in mortgage banking income and includes changes in fair value at and subsequent to funding and gains and losses on the related loan commitment prior to funding.

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- Definition This item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of loans and long-term receivables (other than securities categorized as trading, available-for-sale or held-to-maturity) that have contractual principal amounts and for which the fair value option has been elected. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Fair value portion of mortgage loans held-for-sale. + References No definition available. + Details
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- Definition This is the principal amount outstanding for loans which are in the process of being securitized as of the date of the statement of financial position (across all types of loans). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82924980&loc=d3e107314-111719 + Details
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Balance Type: | credit
Period Type: | instant

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- Details
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