Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Balance	$ 56,142	$ 54,451
Net current-period other comprehensive income (loss)	(717)	387
Balance	56,666	55,267
Gains (Losses) on Cash Flow Hedges [Member]
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Balance	37	17
Net current-period other comprehensive income (loss)	143	14
Balance	180	31
Unrealized Gains (Losses) on Available for Sale Securities [Member]
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Balance	(37)	(765)
Net current-period other comprehensive income (loss)	(860)	373
Balance	(897)	(392)
Supplemental Executive Retirement Plans [Member]
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Balance	125	11
Balance	125	11
Accumulated Other Comprehensive Income (Loss) [Member]
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Balance	125	(737)
Balance	$ (592)	$ (350)