Stockholders' Equity (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period				$ (6,099)
Total other comprehensive income (loss)		$ 327	$ (892)	3,435	$ (2,964)
Balance at end of period		(2,664)		(2,664)
Unrealized Gain (Loss) on Securities
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period	[1]			(3,455)	(2,500)
Other comprehensive (loss) income, before reclassifications	[1]			4,250	(3,915)
Amounts reclassified from accumulated other comprehensive (loss) income	[1]			40	0
Other comprehensive (loss) income, before tax	[1]			4,290	(3,915)
Income tax expense (benefit)	[1]			(901)	822
Total other comprehensive income (loss)	[1]			3,389	(3,093)
Balance at end of period	[1]	(66)	(5,593)	(66)	(5,593)
Unrecognized Net Pension and Postretirement Costs
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period	[2]			(2,644)	(3,162)
Other comprehensive (loss) income, before reclassifications	[2]			58	164
Amounts reclassified from accumulated other comprehensive (loss) income	[2]				0
Other comprehensive (loss) income, before tax	[2]			58	164
Income tax expense (benefit)	[2]			(12)	(35)
Total other comprehensive income (loss)	[2]			46	129
Balance at end of period	[2]	(2,598)	(3,033)	(2,598)	(3,033)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period				(6,099)	(5,662)
Other comprehensive (loss) income, before reclassifications				4,308	(3,751)
Amounts reclassified from accumulated other comprehensive (loss) income				40	0
Other comprehensive (loss) income, before tax				4,348	(3,751)
Income tax expense (benefit)				(913)	787
Total other comprehensive income (loss)		327	(892)	3,435	(2,964)
Balance at end of period		$ (2,664)	$ (8,626)	$ (2,664)	$ (8,626)

[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