Other Comprehensive Income Tax Effects Allocated to Each Component of Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Other Comprehensive Income, before Tax [Abstract]
Net unrealized holding gains (losses) arising during the year on investment securities available-for-sale, Before-Tax Amount	$ 2,568	$ (905)
Reclassification adjustment for net gains on investment securities available-for-sale realized in net income, Before-Tax Amount	(25)	(10)
Total Investment securities available-for-sale, Before-Tax Amount	2,543	(915)
Net actuarial gain arising during the year, Before-Tax Amount	0	1,546
Reclassification adjustment for amortization of net actuarial loss realized in net income, Before-Tax Amount	0	502
Reclassification adjustment for recognized settlement loss, Before-Tax Amount	0	4,022
Total Defined benefit pension plan, Before-Tax Amount	0	6,070
Total other comprehensive loss, Before-Tax Amount	2,543	5,155
Other Comprehensive Income, Tax [Abstract]
Net unrealized holding gains (losses) arising during the period on investment securities available-for-sale, Tax	(539)	191
Reclassification adjustment for net gains on investment securities available-for-sale realized in net income, Tax	5	2
Total Investment securities available-for-sale, Tax	(534)	193
Net actuarial gain arising during the year, Tax	0	(325)
Reclassification adjustment for amortization of net actuarial loss realized in net income, Tax	0	(105)
Reclassification adjustment for recognized settlement loss, Tax	0	(845)
Total Defined benefit pension plan, Tax	0	(1,275)
Total other comprehensive loss, Tax	(534)	(1,082)
Net unrealized holding gains (losses) arising during the year on investment securities available-for-sale	2,029	(714)
Reclassification adjustments for net gains on investment securities available-for-sale realized in net income	(20)	(8)
Total	2,009	(722)
Net actuarial gain arising during the year	0	1,221
Reclassification adjustment for amortization of net actuarial loss realized in net income	0	397
Reclassification adjustment for recognized settlement loss	0	3,177
Total	0	4,795
Total other comprehensive loss	$ 2,009	$ 4,073