Stockholders' Equity (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period				$ (3,755)
Total other comprehensive income		$ 918	$ 1,715	3,151	$ 3,108
Balance at end of period		(604)		(604)
Unrealized Gain (Loss) on Securities
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period	[1]			(23)	(3,455)
Other comprehensive income, before reclassifications	[1]			3,888	3,895
Amounts reclassified from accumulated other comprehensive (loss) income	[1]			(6)	0
Current period other comprehensive income, before tax	[1]			3,882	3,895
Income tax benefit (expense)	[1]			(815)	(818)
Total other comprehensive income	[1]			3,067	3,077
Balance at end of period	[1]	3,044	(378)	3,044	(378)
Unrecognized Net Pension and Postretirement Costs
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period	[2]			(3,732)	(2,644)
Other comprehensive income, before reclassifications	[2]			107	39
Amounts reclassified from accumulated other comprehensive (loss) income	[2]				0
Current period other comprehensive income, before tax	[2]			107	39
Income tax benefit (expense)	[2]			(23)	(8)
Total other comprehensive income	[2]			84	31
Balance at end of period	[2]	(3,648)	(2,613)	(3,648)	(2,613)
Accumulated Other Comprehensive (Loss) Income
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period				(3,755)	(6,099)
Other comprehensive income, before reclassifications				3,995	3,934
Amounts reclassified from accumulated other comprehensive (loss) income				(6)	0
Current period other comprehensive income, before tax				3,989	3,934
Income tax benefit (expense)				(838)	(826)
Total other comprehensive income		918	1,715	3,151	3,108
Balance at end of period		$ (604)	$ (2,991)	$ (604)	$ (2,991)

[1] The pre-tax amounts reclassified from accumulated other comprehensive loss are included in investment securities (loss) gain, net in the consolidated statements of income.

[2] The pre-tax amounts reclassified from accumulated other comprehensive loss are included in the computation of net periodic pension cost