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Investments - Schedule of Available for Sale Securities Continuous Unrealized Loss Position Fair Value (Details) $ in Thousands	Jun. 30, 2018 USD ($) Number	Dec. 31, 2017 USD ($) Number
Debt Securities, Available-for-sale [Line Items]
No. of securities | Number	526	345
Fair value, Less than 12 months	$ 234,778	$ 134,700
Unrealized losses, Less than 12 months	(4,272)	(1,022)
Fair value, 12 months or longer	91,448	89,790
Unrealized losses, 12 months or longer	(3,565)	(2,001)
Total, Fair value	326,226	224,490
Total, Unrealized losses	$ (7,837)	$ (3,023)
US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
No. of securities | Number	1	1
Fair value, Less than 12 months	$ 1,952	$ 1,990
Unrealized losses, Less than 12 months	(47)	(9)
Fair value, 12 months or longer
Unrealized losses, 12 months or longer
Total, Fair value	1,952	1,990
Total, Unrealized losses	$ (47)	$ (9)
US Federal Agency Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
No. of securities | Number	11	14
Fair value, Less than 12 months	$ 3,723	$ 7,989
Unrealized losses, Less than 12 months	(31)	(24)
Fair value, 12 months or longer	9,729	8,272
Unrealized losses, 12 months or longer	(69)	(61)
Total, Fair value	13,452	16,261
Total, Unrealized losses	$ (100)	$ (85)
Municipal Obligations, Tax Exempt [Member]
Debt Securities, Available-for-sale [Line Items]
No. of securities | Number	301	178
Fair value, Less than 12 months	$ 89,803	$ 37,299
Unrealized losses, Less than 12 months	(1,508)	(273)
Fair value, 12 months or longer	33,670	31,930
Unrealized losses, 12 months or longer	(1,598)	(807)
Total, Fair value	123,473	69,229
Total, Unrealized losses	$ (3,106)	$ (1,080)
Municipal Obligations, Taxable [Member]
Debt Securities, Available-for-sale [Line Items]
No. of securities | Number	110	73
Fair value, Less than 12 months	$ 36,430	$ 18,792
Unrealized losses, Less than 12 months	(531)	(96)
Fair value, 12 months or longer	10,984	9,744
Unrealized losses, 12 months or longer	(177)	(120)
Total, Fair value	47,414	28,536
Total, Unrealized losses	$ (708)	$ (216)
Agency Mortgage-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
No. of securities | Number	103	79
Fair value, Less than 12 months	$ 102,870	$ 68,630
Unrealized losses, Less than 12 months	(2,155)	(620)
Fair value, 12 months or longer	37,065	39,844
Unrealized losses, 12 months or longer	(1,721)	(1,013)
Total, Fair value	139,935	108,474
Total, Unrealized losses	$ (3,876)	$ (1,633)

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=82897076&loc=d3e27337-111563

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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.

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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.

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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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
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-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

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