Investment Securities - Unrealized Losses (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Fair Value
Less than 12 months	$ 20,422,000	$ 28,360,000
12 months or more	5,024,000	52,658,000
Total	25,446,000	81,018,000
Unrealized Losses
Less than 12 months	(118,000)	(206,000)
12 months or more	(278,000)	(592,000)
Total	(396,000)	(798,000)
U.S government agency obligations
Fair Value
Less than 12 months	1,686,000	6,238,000
12 months or more	1,557,000	1,809,000
Total	3,243,000	8,047,000
Unrealized Losses
Less than 12 months	(13,000)	(69,000)
12 months or more	(6,000)	(8,000)
Total	(19,000)	(77,000)
U.S. government-sponsored enterprises
Fair Value
Less than 12 months		5,949,000
12 months or more		7,488,000
Total		13,437,000
Unrealized Losses
Less than 12 months		(47,000)
12 months or more		(11,000)
Total		(58,000)
Obligations of states and political subdivisions
Fair Value
Less than 12 months	7,440,000	10,729,000
12 months or more	532,000	1,931,000
Total	7,972,000	12,660,000
Unrealized Losses
Less than 12 months	(50,000)	(53,000)
12 months or more	(3,000)	(6,000)
Total	(53,000)	(59,000)
Mortgage-backed securities
Fair Value
Less than 12 months	11,296,000	5,444,000
12 months or more	1,710,000	40,120,000
Total	13,006,000	45,564,000
Unrealized Losses
Less than 12 months	(55,000)	(37,000)
12 months or more	(8,000)	(391,000)
Total	(63,000)	(428,000)
Bank issued trust preferred securities
Fair Value
Less than 12 months	0	0
12 months or more	1,225,000	1,310,000
Total	1,225,000	1,310,000
Unrealized Losses
Less than 12 months	0	0
12 months or more	(261,000)	(176,000)
Total	$ (261,000)	$ (176,000)