Investment Securities - Unrealized loss positions (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Marketable securities - Fair Value
Less than 12 months	$ 86,684	$ 62,998
12 months or more	24,989	13,746
Total	111,674	76,744
Marketable securities - Unrealized Loss
Less than 12 months	4,963	842
12 months or more	2,404	452
Total	7,367	1,294
Obligations of U.S. Government agencies
Debt securities - Fair Value
Less than 12 months	5,100	1,289
12 months or more	2,646	2,397
Total	7,747	3,686
Debt securities - Unrealized Loss
Less than 12 months	260	35
12 months or more	358	107
Total	618	142
Obligations of States and political subdivisions
Debt securities - Fair Value
Less than 12 months	17,618	2,473
Total	17,618	2,473
Debt securities - Unrealized Loss
Less than 12 months	907	63
Total	907	63
Mortgage-backed securities
Debt securities - Fair Value
Less than 12 months	63,469	59,236
12 months or more	22,343	11,349
Total	85,812	70,585
Debt securities - Unrealized Loss
Less than 12 months	3,793	744
12 months or more	2,046	345
Total	5,839	$ 1,089
Subordinated debt investments
Debt securities - Fair Value
Less than 12 months	497
Total	497
Debt securities - Unrealized Loss
Less than 12 months	3
Total	$ 3