Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net Income	$ 13,280	$ 8,127
Other Comprehensive (Loss) Income, Net of Tax:
Net Unrealized Securities Holding (Loss) Gain Arising During the Period	(3,812)	4,098
Net Unrealized Gain (Loss) on Cash Flow Hedge Agreements	1,475	(219)
Reclassification of Net Unrealized Gain on Cash Flow Hedge Agreements to Interest Expense	(20)	0
Amortization of Net Retirement Plan Actuarial Loss	34	27
Amortization of Net Retirement Plan Prior Service Cost	43	39
Other Comprehensive (Loss) Income	(2,280)	3,945
Comprehensive Income	$ 11,000	$ 12,072