Investment Securities - Unrealized loss position (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Marketable securities - Fair Value
Less than 12 months	$ 26,810	$ 18,577
12 months or more	24,107	32,724
Total	50,917	51,300
Marketable securities - Unrealized Loss
Less than 12 months	3	209
12 months or more	232	985
Total	235	1,195
Obligations of U.S. Government agencies
Debt securities - Fair Value
Less than 12 months	4,640	3,973
12 months or more	4,986	5,927
Total	9,626	9,900
Debt securities - Unrealized Loss
Less than 12 months		18
12 months or more	21	78
Total	21	96
Mortgage-backed securities
Debt securities - Fair Value
Less than 12 months	7,463	5,485
12 months or more	10,211	13,440
Total	17,674	18,924
Debt securities - Unrealized Loss
Less than 12 months		111
12 months or more	103	442
Total	103	553
Obligations of States and political subdivisions
Debt securities - Fair Value
Less than 12 months	14,707	9,119
12 months or more	7,481	11,977
Total	22,188	21,096
Debt securities - Unrealized Loss
Less than 12 months	3	81
12 months or more	37	345
Total	40	426
Equity securities
Equity securities - Fair Value
12 months or more	1,429	1,380
Total	1,429	1,380
Equity securities - Unrealized Loss
12 months or more	71	120
Total	$ 71	$ 120