Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net Income	$ 12,989	$ 11,046	$ 39,548	$ 28,332
Other Comprehensive (Loss) Income, Net of Tax:
Net Unrealized Securities Holding (Loss) Gain Arising During the Period	(1,279)	(296)	(3,969)	5,823
Net Unrealized Gain on Cash Flow Hedge Agreements	183	238	954	37
Reclassification of Net Unrealized Gain on Cash Flow Hedge Agreements to Interest Expense	(25)	0	(68)	0
Amortization of Net Retirement Plan Actuarial Loss	17	42	51	127
Amortization of Net Retirement Plan Prior Service Cost	43	39	129	117
Other Comprehensive (Loss) Income	(1,061)	23	(2,903)	6,104
Comprehensive Income	$ 11,928	$ 11,069	$ 36,645	$ 34,436