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Comprehensive Income Changes in Accumulated Other Comprehensive Income By Component (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 Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Net current-period other comprehensive income (loss)		$ (519)		$ 480		$ (2,959)	$ 634
Amounts reclassified from accumulated other comprehensive income								$ 0
Unrealized Gains and Losses on Available for Sale Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Stockholders' Equity, Period Start		(4,066)	[1]	(335)	[1]	(1,250)	(382)
Other comprehensive income or loss before reclassifications		(635)		409	[1]	(3,120)	456
Amounts reclassified from accumulated other comprehensive income			[1]	0	[1]	0	0
Net current-period other comprehensive income (loss)		(635)	[1]	409	[1]	(3,120)	456
Amounts reclassified from accumulated other comprehensive income								(331)
Stockholders' Equity, Period End	[1]	(4,701)		74		(4,701)	74
Amortization of Net Retirement Plan Actuarial Gain (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Stockholders' Equity, Period Start		(6,334)	[1]	(5,628)	[1]	(6,380)	(5,737)
Other comprehensive income or loss before reclassifications		0	[1]	0	[1]	0	0
Amounts reclassified from accumulated other comprehensive income		75	[1]	72	[1]	121	181
Net current-period other comprehensive income (loss)		75	[1]	72	[1]	121	181
Stockholders' Equity, Period End	[1]	(6,259)		(5,556)		(6,259)	(5,556)
Accretion of Net Retirement Plan Prior Service (Cost) Credit
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Stockholders' Equity, Period Start		(885)	[1]	(717)	[1]	(884)	(715)
Other comprehensive income or loss before reclassifications		0	[1]	0	[1]	0	0
Amounts reclassified from accumulated other comprehensive income		41	[1]	(1)	[1]	40	(3)
Net current-period other comprehensive income (loss)		41	[1]	(1)	[1]	40	(3)
Stockholders' Equity, Period End	[1]	(844)		(718)		(844)	(718)
Accumu-lated Other Com- prehensive Loss
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Stockholders' Equity, Period Start		(11,285)	[1]	(6,680)	[1]	(8,514)	(6,834)
Other comprehensive income or loss before reclassifications		(635)	[1]	409	[1]	(3,120)	456
Amounts reclassified from accumulated other comprehensive income		116	[1]	71	[1]	161	178
Net current-period other comprehensive income (loss)		(519)	[1]	480	[1]	(2,959)	634
Amounts reclassified from accumulated other comprehensive income								$ (331)
Stockholders' Equity, Period End	[1]	$ (11,804)		$ (6,200)		$ (11,804)	$ (6,200)
[1] All amounts are net of tax.

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

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