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Summary of Significant Accounting Policies - Accumulated other comprehensive income (loss) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Summary of Significant Accounting Policies
Reclassification adjustment for losses on available-for-sale debt securities	$ 1,163

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- References

No definition available.

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- Definition

Amount before tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 17A
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