Investment Securities - Gross unrealized losses (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Investment securities available-for-sale
Unrealized losses less than 12 months	$ (91)	$ (313)
Fair value less than 12 months	26,157	46,067
Unrealized losses over 12 months	(29)	(162)
Fair value over 12 months	7,966	36,019
Total Unrealized losses	(120)	(475)
Total Fair value	34,123	82,086
U. S. Treasury and agencies
Investment securities available-for-sale
Unrealized losses less than 12 months	(8)	(5)
Fair value less than 12 months	4,803	1,740
Unrealized losses over 12 months	(8)	(10)
Fair value over 12 months	1,324	9,990
Total Unrealized losses	(16)	(15)
Total Fair value	6,127	11,730
Obligations of state and political agencies
Investment securities available-for-sale
Unrealized losses less than 12 months		(140)
Fair value less than 12 months		11,959
Unrealized losses over 12 months		(21)
Fair value over 12 months		5,798
Total Unrealized losses		(161)
Total Fair value		17,757
Mortgage backed securities - Residential Agency
Investment securities available-for-sale
Unrealized losses less than 12 months	(34)	(52)
Fair value less than 12 months	11,903	17,131
Unrealized losses over 12 months		(79)
Fair value over 12 months		14,036
Total Unrealized losses	(34)	(131)
Total Fair value	11,903	31,167
Mortgage backed securities - Commercial
Investment securities available-for-sale
Unrealized losses less than 12 months		(116)
Fair value less than 12 months		15,235
Unrealized losses over 12 months	(21)	(52)
Fair value over 12 months	6,640	6,195
Total Unrealized losses	(21)	(168)
Total Fair value	6,640	21,430
Asset backed securities
Investment securities available-for-sale
Fair value less than 12 months		2
Fair value over 12 months	2
Total Fair value	2	$ 2
Corporate bonds
Investment securities available-for-sale
Unrealized losses less than 12 months	(49)
Fair value less than 12 months	9,451
Total Unrealized losses	(49)
Total Fair value	$ 9,451