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Investments - Schedule of Available for Sale Securities Continuous Unrealized Loss Position Fair Value (Details) $ in Thousands	Mar. 31, 2019 USD ($) Number	Dec. 31, 2018 USD ($) Number
Debt Securities, Available-for-sale [Line Items]
No. of securities | Number	309	490
Fair value, Less than 12 months	$ 2,662	$ 74,366
Unrealized losses, Less than 12 months	(12)	(536)
Fair value, 12 months or longer	181,024	221,001
Unrealized losses, 12 months or longer	(2,982)	(5,579)
Total, Fair value	183,686	295,367
Total, Unrealized losses	$ (2,994)	$ (6,115)
US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
No. of securities | Number	1	1
Fair value, Less than 12 months
Unrealized losses, Less than 12 months
Fair value, 12 months or longer	1,984	1,971
Unrealized losses, 12 months or longer	(15)	(28)
Total, Fair value	1,984	1,971
Total, Unrealized losses	$ (15)	$ (28)
US Federal Agency Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
No. of securities | Number	4	6
Fair value, Less than 12 months		$ 145
Unrealized losses, Less than 12 months		(1)
Fair value, 12 months or longer	4,624	7,970
Unrealized losses, 12 months or longer	(19)	(40)
Total, Fair value	4,624	8,115
Total, Unrealized losses	$ (19)	$ (41)
Municipal Obligations, Tax Exempt [Member]
Debt Securities, Available-for-sale [Line Items]
No. of securities | Number	164	296
Fair value, Less than 12 months	$ 2,662	$ 35,898
Unrealized losses, Less than 12 months	(12)	(367)
Fair value, 12 months or longer	59,794	85,921
Unrealized losses, 12 months or longer	(945)	(2,403)
Total, Fair value	62,456	121,819
Total, Unrealized losses	$ (957)	$ (2,770)
Municipal Obligations, Taxable [Member]
Debt Securities, Available-for-sale [Line Items]
No. of securities | Number	51	86
Fair value, Less than 12 months		$ 8,293
Unrealized losses, Less than 12 months		(22)
Fair value, 12 months or longer	22,025	28,984
Unrealized losses, 12 months or longer	(121)	(301)
Total, Fair value	22,025	37,277
Total, Unrealized losses	$ (121)	$ (323)
Agency Mortgage-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
No. of securities | Number	89	101
Fair value, Less than 12 months		$ 30,030
Unrealized losses, Less than 12 months		(146)
Fair value, 12 months or longer	92,597	96,155
Unrealized losses, 12 months or longer	(1,882)	(2,807)
Total, Fair value	92,597	126,185
Total, Unrealized losses	$ (1,882)	$ (2,953)

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

No definition available.

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- Definition

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=118939692&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

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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

No definition available.

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This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.

+ References

No definition available.

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+ References

No definition available.

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- Definition

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563

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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.

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