Stockholders' Equity (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period		$ (3,755)
Total other comprehensive income		2,233	$ 1,393
Balance at end of period		(1,522)		$ (3,755)
Unrealized Loss on Securities
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period	[1]	(23)	(3,455)	(3,455)
Other comprehensive income, before reclassifications	[1]		1,745	2,760
Amounts reclassified from accumulated other comprehensive (loss) income	[1]		0
Current period other comprehensive income, before tax	[1]	2,760	1,745
Income tax benefit (expense)	[1]	(580)	(367)
Total other comprehensive income	[1]	2,180	1,378
Balance at end of period	[1]	2,157	(2,077)	(23)
Unrecognized Net Pension and Postretirement Costs
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period	[2]	(3,732)	(2,644)	(2,644)
Other comprehensive income, before reclassifications	[2]		19	67
Amounts reclassified from accumulated other comprehensive (loss) income	[2]		0
Current period other comprehensive income, before tax	[2]	67	19
Income tax benefit (expense)	[2]	(14)	(4)
Total other comprehensive income	[2]	53	15
Balance at end of period	[2]	(3,679)	(2,629)	(3,732)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period		(3,755)	(6,099)	(6,099)
Other comprehensive income, before reclassifications			1,764	2,827
Amounts reclassified from accumulated other comprehensive (loss) income			0
Current period other comprehensive income, before tax		2,827	1,764
Income tax benefit (expense)		(594)	(371)
Total other comprehensive income		2,233	1,393
Balance at end of period		$ (1,522)	$ (4,706)	$ (3,755)

[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