Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net Income	$ 11,046	$ 10,067	$ 28,332	$ 27,735
Other Comprehensive Income, Net of Tax:
Net Unrealized Securities Holding (Losses) Gains Arising During the Period	(296)	499	5,823	4,323
Net Unrealized Gain on Cash Flow Hedge Agreements	238	0	37	0
Amortization of Net Retirement Plan Actuarial Loss	42	127	127	381
Amortization of Net Retirement Plan Prior Service Cost	39	42	117	127
Other Comprehensive Income	23	668	6,104	4,831
Comprehensive Income	$ 11,069	$ 10,735	$ 34,436	$ 32,566