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Other Comprehensive Income (Loss) - Activity in AOCI (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances at Beginning				$ 549,405	$ 516,466
Net current-period other comprehensive income (loss)		$ 909	$ (3,393)	4,394	14,341
Balances at Ending		589,868	561,190	589,868	561,190
Available-for-Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances at Beginning		(4,887)	14,566	(7,915)	(2,744)
Other comprehensive income (loss) before reclassifications		426	(3,333)	3,454	14,260
Amounts reclassified from accumulated other comprehensive (loss) income		254	(273)	254	(556)
Net current-period other comprehensive income (loss)		680	(3,606)	3,708	13,704
Balances at Ending		(4,207)	10,960	(4,207)	10,960
Employee Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances at Beginning		(28,737)	(27,833)	(29,194)	(28,257)
Other comprehensive income (loss) before reclassifications		0	0	0	0
Amounts reclassified from accumulated other comprehensive (loss) income	[1]	229	213	686	637
Net current-period other comprehensive income (loss)		229	213	686	637
Balances at Ending		(28,508)	(27,620)	(28,508)	(27,620)
Accumulated Other Comprehensive (Loss) Income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances at Beginning		(33,624)	(13,267)	(37,109)	(31,001)
Other comprehensive income (loss) before reclassifications		426	(3,333)	3,454	14,260
Amounts reclassified from accumulated other comprehensive (loss) income		483	(60)	940	81
Net current-period other comprehensive income (loss)		909	(3,393)	4,394	14,341
Balances at Ending		$ (32,715)	$ (16,660)	$ (32,715)	$ (16,660)
[1] Amounts in parentheses indicated debits in income statement.

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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, before reclassification adjustments of other comprehensive income (loss).

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Amount after tax and 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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