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Other Comprehensive Income (Loss) - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2018	Jan. 01, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances at beginning	$ 620,871	$ 576,202	$ 549,405
Adoption of ASU 2016-01					$ 0
Balances at ending	663,054	620,871	576,202
Available-for-Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances at beginning	(23,589)	(13,005)	(7,915)
Other comprehensive income (loss)	27,628	(10,649)	(2,437)
Balances at ending	4,039	(23,589)	(13,005)
Employee Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances at beginning	(39,576)	(38,291)	(29,194)
Other comprehensive income (loss)	(8,027)	(1,285)	(1,792)
Balances at ending	(47,603)	(39,576)	(38,291)
Accumulated Other Comprehensive Income (loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances at beginning	(63,165)	(51,296)	(37,109)
Other comprehensive income (loss)	19,601	(11,934)	(4,229)
Adoption of ASU 2016-01					$ (9,958)
Balances at ending	$ (43,564)	$ (63,165)	(51,296)
Accounting Standards Update 2018-02 | Available-for-Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassification due to adoption of ASU			(2,653)
Accounting Standards Update 2018-02 | Employee Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassification due to adoption of ASU			(7,305)
Accounting Standards Update 2018-02 | Accumulated Other Comprehensive Income (loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassification due to adoption of ASU			$ (9,958)
Accounting Standards Update 2016-01
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Adoption of ASU 2016-01				$ 0
Accounting Standards Update 2016-01 | Available-for-Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Adoption of ASU 2016-01				65
Accounting Standards Update 2016-01 | Employee Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Adoption of ASU 2016-01				0
Accounting Standards Update 2016-01 | Accumulated Other Comprehensive Income (loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Adoption of ASU 2016-01				$ 65

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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).

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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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