Investment Securities - Unrealized loss positions (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Marketable securities - Fair Value
Less than 12 months	$ 21,538	$ 18,577
12 months or more	6,489	32,724
Total	28,027	51,300
Marketable securities - Unrealized Loss
Less than 12 months	109	209
12 months or more	60	985
Total	169	1,195
Obligations of U.S. Government agencies
Debt securities - Fair Value
Less than 12 months	5,269	3,973
12 months or more	2,000	5,927
Total	7,269	9,900
Debt securities - Unrealized Loss
Less than 12 months	34	18
12 months or more	2	78
Total	36	96
Mortgage-backed securities
Debt securities - Fair Value
Less than 12 months	11,600	5,485
12 months or more	4,489	13,440
Total	16,089	18,924
Debt securities - Unrealized Loss
Less than 12 months	32	111
12 months or more	58	442
Total	90	553
Obligations of States and political subdivisions
Debt securities - Fair Value
Less than 12 months	4,669	9,119
12 months or more		11,977
Total	4,669	21,096
Debt securities - Unrealized Loss
Less than 12 months	43	81
12 months or more		345
Total	$ 43	426
Equity securities
Equity securities - Fair Value
12 months or more		1,380
Total		1,380
Equity securities - Unrealized Loss
12 months or more		120
Total		$ 120