Accumulated Other Comprehensive Income (Loss) (Amounts Reclassified Out of Each Component of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		3 Months Ended						6 Months Ended
		Jun. 30, 2023		Mar. 31, 2023	Jun. 30, 2022		Mar. 31, 2022	Jun. 30, 2023		Jun. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net loss on investment securities		$ 0			$ 15			$ 0		$ 15
Interest income		42,337			41,597			84,152		81,155
Income (loss) before income taxes		16,791			19,507			31,655		37,933
Income tax expense		(2,418)			(3,859)			(5,193)		(7,302)
Net income (loss)		14,373		$ 12,089	15,648		$ 14,983	26,462		30,631
Securities Available for Sale and Transferred Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification, Pre-tax Amount		16	[1]		41	[2]		35	[1]	72	[2]
Reclassification tax		(4)	[1]		(10)	[2]		(9)	[1]	(18)	[2]
Total reclassified for the period		12	[1]		31	[2]		26	[1]	54	[2]
Prior Service Credit [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification, Pre-tax Amount	[3]	123			0			245		0
Net Actuarial Losses [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification, Pre-tax Amount	[3]	(316)			(64)			(632)		(128)
Pension And Post-Retirement Obligations [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification, Pre-tax Amount		(193)			(64)			(387)		(128)
Reclassification tax		49			17			99		33
Total reclassified for the period		(144)			(47)			(288)		(95)
Accumulated Other Comprehensive income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassified for the period		(156)			(78)			(314)		(149)
Reclassification out of Accumulated Other Comprehensive (Loss) Income [Member] | Securities Available for Sale and Transferred Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net loss on investment securities		0			(15)			0		(15)
Interest income		(16)			(26)			(35)		(57)
Income (loss) before income taxes		(16)			(41)			(35)		(72)
Income tax expense		4			10			9		18
Net income (loss)		$ (12)			$ (31)			$ (26)		$ (54)

[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] 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.

[3] These items are included in the computation of net periodic pension expense. See Note 13 – Employee Benefit Plans for additional information.