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Investments - Schedule of Available For Sale Securities Continuous Unrealized Loss Position Fair Value (Details) $ in Thousands	Sep. 30, 2017 USD ($) Number	Dec. 31, 2016 USD ($) Number
Schedule of Available-for-sale Securities [Line Items]
No. of securities | Number	229	408
Fair value, Less than 12 months	$ 123,780	$ 222,093
Unrealized losses, Less than 12 months	(912)	(4,208)
Fair value, 12 months or longer	42,575	0
Unrealized losses, 12 months or longer	(851)	0
Total, Fair value	166,355	222,093
Total, Unrealized losses	$ (1,763)	$ (4,208)
US Federal Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
No. of securities | Number	10	9
Fair value, Less than 12 months	$ 13,812	$ 15,056
Unrealized losses, Less than 12 months	(35)	(49)
Fair value, 12 months or longer	995
Unrealized losses, 12 months or longer	(5)
Total, Fair value	14,807	15,056
Total, Unrealized losses	$ (40)	$ (49)
Municipal Obligations Tax Exempt [Member]
Schedule of Available-for-sale Securities [Line Items]
No. of securities | Number	116	275
Fair value, Less than 12 months	$ 17,851	$ 97,842
Unrealized losses, Less than 12 months	(141)	(2,666)
Fair value, 12 months or longer	32,217
Unrealized losses, 12 months or longer	(640)
Total, Fair value	50,068	97,842
Total, Unrealized losses	$ (781)	$ (2,666)
Municipal Obligations Taxable [Member]
Schedule of Available-for-sale Securities [Line Items]
No. of securities | Number	43	66
Fair value, Less than 12 months	$ 14,117	$ 26,184
Unrealized losses, Less than 12 months	(70)	(271)
Fair value, 12 months or longer	1,723
Unrealized losses, 12 months or longer	(22)
Total, Fair value	15,840	26,184
Total, Unrealized losses	$ (92)	$ (271)
Agency Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
No. of securities | Number	60	58
Fair value, Less than 12 months	$ 78,000	$ 83,011
Unrealized losses, Less than 12 months	(666)	(1,222)
Fair value, 12 months or longer	7,640
Unrealized losses, 12 months or longer	(184)
Total, Fair value	85,640	83,011
Total, Unrealized losses	$ (850)	$ (1,222)

X

- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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- Definition

This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 320
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Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

+ References

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