Stock Based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

Stock Based Compensation [Abstract]

Schedule Of Share-based Compensation, Stock Options, Activity

(Dollars in thousands except share and per share data)
	ESPP	Weighted Average		Aggregate
	Options	Price Per Share		Intrinsic Value
Balance Outstanding at December 31, 2015	22,286	$	23.42	$	2
Granted	24,434		22.46
Exercised	(907)		22.66
Expired	(23,055)		23.38
Balance Outstanding at December 31, 2016	22,758	$	22.46	$	140
Granted	19,086		29.95
Exercised	(6,827)		23.00
Expired	(17,180)		22.79
Balance Outstanding at December 31, 2017	17,837	$	29.95	$	132
Granted	19,790		32.73
Exercised	(3,257)		30.54
Expired	(15,992)		30.07
Balance Outstanding at December 31, 2018	18,378	$	32.73	$	—
Shares available for future grants at December 31, 2018	196,284

	ISOP	Weighted Average		Aggregate
	Options	Price Per Share		Intrinsic Value
Balance Outstanding at December 31, 2015	53,075	$	22.56	$	50
Granted	24,450		21.27
Exercised	(3,800)		16.00
Forfeited	(15,000)		24.14
Balance Outstanding at December 31, 2016	58,725	$	22.03	$	386
Granted	33,450		30.00
Exercised	(750)		23.77
Forfeited	(6,200)		27.37
Balance Outstanding at December 31, 2017	85,225	$	24.75	$	1,075
Granted	34,054		34.10
Exercised	(12,268)		21.55
Forfeited	(3,000)		23.77
Balance Outstanding at December 31, 2018	104,011	$	28.22	$	341
Shares available for future grants at December 31, 2018	259,123

Share-based Compensation Arrangement By Share-based Payment Award, Options, Vested And Expected To Vest, Outstanding And Exercisable

	Options					Weighted
	Outstanding		Exercise Price or	Weighted Average		Average Remaining
Stock Option Plan	and Exercisable		Price Range	Exercise Price		Life (years)
Employee Stock Purchase Plan	18,378	$	32.73	$	32.73	0.5
Incentive Stock Option Plan	3,107		16.11		16.11	0.2
Incentive Stock Option Plan	33,400		21.27 - 22.05		21.56	6.8
Incentive Stock Option Plan	67,504		30.00 - 34.10		32.07	8.7
ISOP Total/Average	104,011			$	28.22	7.8

Valuation Assumptions Using Black-Scholes Method

	2018		2017		2016
Incentive Stock Option Plan
Options granted		34,054		33,450		24,450
Risk-free interest rate		2.66%		1.87%		1.22%
Expected volatility of the Corporation's stock		19.51%		23.12%		25.76%
Expected dividend yield		2.49%		2.94%		3.23%
Expected life (in years)		5.25		5.25		5.25
Weighted average fair value of options granted	$	5.42	$	4.81	$	3.58
(Dollars in thousands)
Compensation expense included in net income
ESPP	$	—	$	—	$	—
ISOP		185		161		88
Total compensation expense included in net income	$	185	$	161	$	88