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Other Comprehensive Income (Loss) - Activity in AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances at Beginning			$ 576,202	$ 549,405
Net current-period other comprehensive (loss) income	$ (3,819)	$ 2,060	(18,205)	3,485
Balances at Ending	590,649	576,915	590,649	576,915
Available-for-Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances at Beginning	(27,644)	(6,718)	(13,005)	(7,915)
Other comprehensive income (loss) before reclassifications	(4,028)	1,831	(18,638)	3,028
Amounts reclassified from accumulated other comprehensive (loss) income	(128)	0	(222)	0
Adoption of ASU 2016-01					$ 65
Net current-period other comprehensive (loss) income	(4,156)	1,831	(18,860)	3,028
Balances at Ending	(31,800)	(4,887)	(31,800)	(4,887)
Employee Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances at Beginning	(37,973)	(28,966)	(38,291)	(29,194)
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive (loss) income	337	229	655	457
Adoption of ASU 2016-01					0
Net current-period other comprehensive (loss) income	337	229	655	457
Balances at Ending	(37,636)	(28,737)	(37,636)	(28,737)
Accumulated Other Comprehensive (Loss) Income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances at Beginning	(65,617)	(35,684)	(51,296)	(37,109)
Other comprehensive income (loss) before reclassifications	(4,028)	1,831	(18,638)	3,028
Amounts reclassified from accumulated other comprehensive (loss) income	209	229	433	457
Adoption of ASU 2016-01					$ 65
Net current-period other comprehensive (loss) income	(3,819)	2,060	(18,205)	3,485
Balances at Ending	$ (69,436)	$ (33,624)	$ (69,436)	$ (33,624)

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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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- Definition

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).

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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