Investment Securities - Amortized Cost and Fair Value of Investment Securities Available-for-sale (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Securities:
Total	$ 151,490	$ 191,301
Gross Unrealized Gains	5,355	3,647
Gross Unrealized Losses	(178)	(273)
Fair Value	156,667	194,675
Marketable Equity Securities:
Total Marketable Equity Securities	2,289	2,710
Total Available-for-Sale Securities	158,956	197,385
U.S. Government Agencies
Debt Securities:
Total	41,994	47,993
Gross Unrealized Gains	16	227
Gross Unrealized Losses	(178)	(164)
Fair Value	41,832	48,056
Obligations of States and Political Subdivisions
Debt Securities:
Total	20,761	25,026
Gross Unrealized Gains	1,290	819
Gross Unrealized Losses	0	(2)
Fair Value	22,051	25,843
Mortgage-Backed Securities - Government-Sponsored Enterprises
Debt Securities:
Total	88,735	118,282
Gross Unrealized Gains	4,049	2,601
Gross Unrealized Losses	0	(107)
Fair Value	92,784	120,776
Mutual Funds
Marketable Equity Securities:
Total Marketable Equity Securities	1,022	997
Other
Marketable Equity Securities:
Total Marketable Equity Securities	$ 1,267	$ 1,713