Comprehensive Income - Components of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Accumulated Other Comprehensive Income (AOCI)
Beginning balance	$ 150,192	$ 145,625
Total other comprehensive income (loss)	(3,485)	257
Stranded AOCI	0
Mark to market on equity positions			$ 0
Ending balance	150,421	138,725
Unrealized gains (losses) on available for-sale securities
Accumulated Other Comprehensive Income (AOCI)
Beginning balance	(5)	(1,598)
Other comprehensive loss before reclassification	(3,247)	269
Amounts reclassified from AOCI	(238)	(110)
Total other comprehensive income (loss)	(3,485)	159
Stranded AOCI	0
Mark to market on equity positions			(98)
Ending balance	(3,588)	(1,439)
Defined benefit pension plan items
Accumulated Other Comprehensive Income (AOCI)
Beginning balance	(2,983)	(2,679)
Other comprehensive loss before reclassification	(46)	62
Amounts reclassified from AOCI	46	36
Total other comprehensive income (loss)	0	98
Stranded AOCI	(646)
Mark to market on equity positions			0
Ending balance	(3,629)	(2,581)
Accumulated Other Comprehensive (Loss)
Accumulated Other Comprehensive Income (AOCI)
Beginning balance	(2,988)	(4,277)
Other comprehensive loss before reclassification	(3,293)	331
Amounts reclassified from AOCI	(192)	(74)
Total other comprehensive income (loss)	(3,485)	257
Stranded AOCI	(646)
Mark to market on equity positions			$ (98)
Ending balance	$ (7,217)	$ (4,020)

Tax Cuts And Jobs Act, Reclassification From AOCI To Retained Earnings, Tax Effect

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- Definition

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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- Definition

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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