Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Balance	$ 60,007	$ 56,142
Reclassification of net unrealized gains on equity securities from accumulated other comprehensive income (loss)	62	423
Other comprehensive income (loss) before reclassifications	830	(717)
Balance	62,133	56,666
Gains (Losses) on Cash Flow Hedges [Member]
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Balance	172	37
Other comprehensive income (loss) before reclassifications	(92)	143
Balance	80	180
Unrealized Gains (Losses) on Available for Sale Securities [Member]
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Balance	(850)	(37)
Reclassification of net unrealized gains on equity securities from accumulated other comprehensive income (loss)		10
Other comprehensive income (loss) before reclassifications	922	(860)
Balance	72	(887)
Supplemental Executive Retirement Plans [Member]
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Balance	140	125
Balance	140	125
Accumulated Other Comprehensive Income (Loss) [Member]
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Balance	(538)	125
Reclassification of net unrealized gains on equity securities from accumulated other comprehensive income (loss)		10
Balance	$ 292	$ (582)