Investment Securities - Unrealized loss position (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Marketable securities - Fair Value
Less than 12 months	$ 9,017	$ 18,577
12 months or more	9,456	32,724
Total	18,473	51,300
Marketable securities - Unrealized Loss
Less than 12 months	52	209
12 months or more	111	985
Total	163	1,195
Obligations of U.S. Government agencies
Debt securities - Fair Value
Less than 12 months	999	3,973
12 months or more	2,997	5,927
Total	3,996	9,900
Debt securities - Unrealized Loss
Less than 12 months	2	18
12 months or more	6	78
Total	8	96
Mortgage-backed securities
Debt securities - Fair Value
Less than 12 months	5,496	5,485
12 months or more	4,754	13,440
Total	10,250	18,924
Debt securities - Unrealized Loss
Less than 12 months	21	111
12 months or more	57	442
Total	78	553
Obligations of States and political subdivisions
Debt securities - Fair Value
Less than 12 months	2,522	9,119
12 months or more	253	11,977
Total	2,775	21,096
Debt securities - Unrealized Loss
Less than 12 months	29	81
12 months or more		345
Total	29	426
Equity securities
Equity securities - Fair Value
12 months or more	1,452	1,380
Total	1,452	1,380
Equity securities - Unrealized Loss
12 months or more	48	120
Total	$ 48	$ 120