Accumulated Other Comprehensive Loss - Components of accumulated other comprehensive loss and activity (Details) $ in Thousands	3 Months Ended
Mar. 31, 2017 USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance, Net unrealized gains (losses) on available for sale securities	$ (28)
Beginning balance, Income tax benefit (expense) on other comprehensive loss	9
Beginning balance, Total accumulated other comprehensive income (loss), net of taxes	(19)
Increase/Decrease, Net unrealized gains (losses) on available for sale securities	42
Increase/Decrease, Income tax benefit (expense) on other comprehensive loss	(14)
Increase/Decrease, Total accumulated other comprehensive income (loss), net of taxes	28
Reclassification Adjustments, Net unrealized gains (losses) on available for sale securities
Reclassification Adjustments, Income tax benefit (expense) on other comprehensive loss
Reclassification Adjustments, Total accumulated other comprehensive loss, net of taxes
Ending balance, Net unrealized gains (losses) on available for sale securities	14
Ending balance, Income tax benefit (expense) on other comprehensive loss	(5)
Ending balance, Total accumulated other comprehensive income (loss), net of taxes	9
Unrealized losses on available for sale securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance, Net unrealized gains (losses) on available for sale securities	(45)
Increase/Decrease, Net unrealized gains (losses) on available for sale securities	21
Reclassification Adjustments, Net unrealized gains (losses) on available for sale securities
Ending balance, Net unrealized gains (losses) on available for sale securities	(24)
Unrealized gains on available for sale securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance, Net unrealized gains (losses) on available for sale securities	17
Increase/Decrease, Net unrealized gains (losses) on available for sale securities	21
Reclassification Adjustments, Net unrealized gains (losses) on available for sale securities
Ending balance, Net unrealized gains (losses) on available for sale securities	$ 38

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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- Definition

Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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-Section 45
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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580

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- Definition

Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, including portion attributable to noncontrolling interest. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners).

+ References

No definition available.

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Amount of tax expense (benefit) allocated to accumulated other comprehensive income (loss) including portion attributable to noncontrolling interest.

+ References

No definition available.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
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Amount before tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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Amount before tax and reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities.

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