Fair Value Measurements - Recurring Assets (Details) - Recurring - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Mortgage-backed securities
Fair Value Measurements [Abstract]
Total assets, fair value	$ 5,980	$ 6,153
State and political securities
Fair Value Measurements [Abstract]
Total assets, fair value	86,958	79,541
Other debt securities
Fair Value Measurements [Abstract]
Total assets, fair value	48,824	48,591
Financial institution equity securities
Fair Value Measurements [Abstract]
Total assets, fair value	580	552
Other equity securities - Available for sales
Fair Value Measurements [Abstract]
Total assets, fair value	1,239	1,224
Other equity securities - Trading
Fair Value Measurements [Abstract]
Total assets, fair value	42	36
Level I | Mortgage-backed securities
Fair Value Measurements [Abstract]
Total assets, fair value	0	0
Level I | State and political securities
Fair Value Measurements [Abstract]
Total assets, fair value	0	0
Level I | Other debt securities
Fair Value Measurements [Abstract]
Total assets, fair value	0	0
Level I | Financial institution equity securities
Fair Value Measurements [Abstract]
Total assets, fair value	580	552
Level I | Other equity securities - Available for sales
Fair Value Measurements [Abstract]
Total assets, fair value	1,239	1,224
Level I | Other equity securities - Trading
Fair Value Measurements [Abstract]
Total assets, fair value	42	36
Level II | Mortgage-backed securities
Fair Value Measurements [Abstract]
Total assets, fair value	5,980	6,153
Level II | State and political securities
Fair Value Measurements [Abstract]
Total assets, fair value	86,958	79,541
Level II | Other debt securities
Fair Value Measurements [Abstract]
Total assets, fair value	48,824	48,591
Level II | Financial institution equity securities
Fair Value Measurements [Abstract]
Total assets, fair value	0	0
Level II | Other equity securities - Available for sales
Fair Value Measurements [Abstract]
Total assets, fair value	0	0
Level II | Other equity securities - Trading
Fair Value Measurements [Abstract]
Total assets, fair value	0	0
Level III | Mortgage-backed securities
Fair Value Measurements [Abstract]
Total assets, fair value	0	0
Level III | State and political securities
Fair Value Measurements [Abstract]
Total assets, fair value	0	0
Level III | Other debt securities
Fair Value Measurements [Abstract]
Total assets, fair value	0	0
Level III | Financial institution equity securities
Fair Value Measurements [Abstract]
Total assets, fair value	0	0
Level III | Other equity securities - Available for sales
Fair Value Measurements [Abstract]
Total assets, fair value	0	0
Level III | Other equity securities - Trading
Fair Value Measurements [Abstract]
Total assets, fair value	$ 0	$ 0