Accumulated Other Comprehensive Income (Loss) (Amounts Reclassified Out of Each Component of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net gain on investment securities		$ 0	$ 74
Interest income		39,558	37,857
Income before income taxes		18,426	26,057
Income tax expense		(3,443)	(5,347)
Net income		14,983	20,710
Securities Available for Sale and Transferred Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification before tax	[1]	(31)	(1)
Reclassification tax	[1]	8	0
Total reclassified for the period	[1]	(23)	(1)
Prior Service Credit [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification before tax	[2]	0	1
Net Actuarial Losses [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification before tax	[2]	(64)	(186)
Pension And Post-Retirement Obligations [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification before tax		(64)	(185)
Reclassification tax		16	47
Total reclassified for the period		(48)	(138)
Accumulated Other Comprehensive income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassified for the period		(71)	(137)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Securities Available for Sale and Transferred Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net gain on investment securities		(0)	74
Interest income		(31)	(73)
Income before income taxes		(31)	1
Income tax expense		8	0
Net income		$ (23)	$ 1

[1] Includes amounts related to the amortization/accretion of unrealized net gains and losses related to the Company’s reclassification of available for sale investment securities to the held to maturity category. The unrealized net gains/losses will be amortized/accreted over the remaining life of the investment securities as an adjustment of yield.

[2] These items are included in the computation of net periodic pension expense. See Note 14 – Employee Benefit Plans for additional information.