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Subordinated Debt - Schedule of Subordinated Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Unamortized Discount and Debt Issuance Costs	$ (1,163)	$ (1,274)
Subordinated Debt
Debt Instrument [Line Items]
Principal	35,000	38,000
Unamortized Discount and Debt Issuance Costs	(1,163)	(1,274)
Subordinated Debt | 2021 Debenture
Debt Instrument [Line Items]
Principal	0	3,000
Unamortized Discount and Debt Issuance Costs	0	0
Subordinated Debt | 2025 Note
Debt Instrument [Line Items]
Principal	10,000	10,000
Unamortized Discount and Debt Issuance Costs	(168)	(186)
Subordinated Debt | 2026 Notes
Debt Instrument [Line Items]
Principal	25,000	25,000
Unamortized Discount and Debt Issuance Costs	$ (995)	$ (1,088)

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Amount, after accumulated amortization, of debt discount.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-Name Accounting Standards Codification
-Topic 210
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-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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