Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Changes in balances of each component of accumulated other comprehensive income, net of taxes [Roll Forward]
Beginning Balance	$ 112,983	$ 105,506
Net current period other comprehensive loss	(5,644)	2,184
Ending Balance	101,724	106,981
ASU 2016-01 [Member]
Changes in balances of each component of accumulated other comprehensive income, net of taxes [Roll Forward]
Cumulative effect of adoption of updated accounting guidance for equity financial instruments at January 1, 2018	0
ASU 2018-02 [Member]
Changes in balances of each component of accumulated other comprehensive income, net of taxes [Roll Forward]
Reclassification of certain tax effects from accumulated other comprehensive income at January 1, 2018	0
AOCI Attributable to Parent [Member]
Changes in balances of each component of accumulated other comprehensive income, net of taxes [Roll Forward]
Beginning Balance	9,751	5,830
Total effect of adoption of updated guidance at January 1, 2018	(7,725)
Net current period other comprehensive loss	(5,644)	2,184
Ending Balance	(3,618)	$ 8,014
AOCI Attributable to Parent [Member] \| ASU 2016-01 [Member]
Changes in balances of each component of accumulated other comprehensive income, net of taxes [Roll Forward]
Cumulative effect of adoption of updated accounting guidance for equity financial instruments at January 1, 2018	(9,825)
AOCI Attributable to Parent [Member] \| ASU 2018-02 [Member]
Changes in balances of each component of accumulated other comprehensive income, net of taxes [Roll Forward]
Reclassification of certain tax effects from accumulated other comprehensive income at January 1, 2018	2,100
Unrealized Gains on Available-for-Sale Securities [Member]
Changes in balances of each component of accumulated other comprehensive income, net of taxes [Roll Forward]
Other comprehensive loss before reclassifications	(5,352)
Amounts reclassified from accumulated other comprehensive loss	(292)
Net current period other comprehensive loss	$ (5,644)

Amount of the total effect of a new accounting principles applied in the period of adoption.

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Amount of increase (decrease) in accumulated other comprehensive income (AOCI) for reclassification of certain tax effects.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Amount after tax of reclassification adjustments of other comprehensive income (loss) attributable to parent.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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