Accumulated Comprehensive Income Loss, By Component (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance		$ 154,774	$ 139,229
Other comprehensive income (loss) before reclassifications (net of tax)		3,424	1,048
Amounts reclassified from accumulated other comprehensive income (loss) (net of tax)		123	48
Net other comprehensive income (loss), net of tax		3,547	1,096
Balance		159,923	142,845
Accumulated Other Comprehensive Loss [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance		(629)	(3,921)
Net other comprehensive income (loss), net of tax		3,547	1,096
Balance		2,918	(2,825)
Unrealized Gain (Loss) on Available for Sale Securities [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance		2,290	(973)	[1]
Other comprehensive income (loss) before reclassifications (net of tax)		3,424	1,048
Amounts reclassified from accumulated other comprehensive income (loss) (net of tax)		0	0
Net other comprehensive income (loss), net of tax		3,424	1,048
Balance		5,714	75
Defined Benefit Pension Items [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	[1]	(2,919)	(2,948)
Other comprehensive income (loss) before reclassifications (net of tax)		0	0
Amounts reclassified from accumulated other comprehensive income (loss) (net of tax)		123	48
Net other comprehensive income (loss), net of tax		123	48
Balance	[1]	$ (2,796)	$ (2,900)

[1] Amounts in parentheses indicate debits.