Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net Income	$ 13,279	$ 9,159	$ 26,559	$ 17,286
Other Comprehensive Income (Loss), Net of Tax:
Net Unrealized Securities Holding Gain (Loss) Arising During the Period	1,122	2,021	(2,690)	6,119
Net Unrealized (Loss) Gain on Cash Flow Hedge Agreements	(704)	18	771	(201)
Reclassification of Net Unrealized Gain on Cash Flow Hedge Agreements to Interest Expense	(23)	0	(43)	0
Amortization of Net Retirement Plan Actuarial Loss	0	58	34	85
Amortization of Net Retirement Plan Prior Service Cost	43	39	86	78
Other Comprehensive Income (Loss)	438	2,136	(1,842)	6,081
Comprehensive Income	$ 13,717	$ 11,295	$ 24,717	$ 23,367