Securities - Schedule of Marketable Securities in Unrealized Loss Position (Details) $ in Thousands	Jun. 30, 2019 USD ($) loan	Dec. 31, 2018 USD ($) loan
Available for sale at fair value:
Available for sale, Total number in a loss position | loan	20	45
Available-for-sale, Less than 12 months, Estimated fair value	$ 0	$ 5,416
Available for sale, Less than 12 months Unrealized loss	0	(53)
Available for sale, 12 months and greater, Estimated fair value	18,956	35,038
Available for sale, 12 months and greater, Unrealized loss	(486)	(1,197)
Available for sale, Total Estimated fair value	18,956	40,454
Available for sale, Total Unrealized loss	$ (486)	$ (1,250)
Held to maturity at cost:
Held to maturity, Total number in a loss position | loan	6	9
Held to maturity, Less than 12 months Estimated fair value	$ 0	$ 1,277
Held to maturity, Less than 12 months Unrealized loss	0	(15)
Held to maturity, 12 months and greater, Estimated fair value	4,685	6,687
Held to maturity, 12 months and greater, Unrealized loss	(78)	(269)
Held to maturity, Total Estimated fair value	4,685	7,964
Held to maturity, Total Unrealized loss	$ (78)	$ (284)
U.S. Government sponsored entities
Available for sale at fair value:
Available for sale, Total number in a loss position | loan	5	5
Available-for-sale, Less than 12 months, Estimated fair value	$ 0	$ 0
Available for sale, Less than 12 months Unrealized loss	0	0
Available for sale, 12 months and greater, Estimated fair value	5,737	5,642
Available for sale, 12 months and greater, Unrealized loss	(17)	(116)
Available for sale, Total Estimated fair value	5,737	5,642
Available for sale, Total Unrealized loss	$ (17)	$ (116)
Held to maturity at cost:
Held to maturity, Total number in a loss position | loan	2	2
Held to maturity, Less than 12 months Estimated fair value	$ 0	$ 0
Held to maturity, Less than 12 months Unrealized loss	0	0
Held to maturity, 12 months and greater, Estimated fair value	2,271	2,434
Held to maturity, 12 months and greater, Unrealized loss	(27)	(94)
Held to maturity, Total Estimated fair value	2,271	2,434
Held to maturity, Total Unrealized loss	$ (27)	$ (94)
State and political subdivisions
Available for sale at fair value:
Available for sale, Total number in a loss position | loan	1	4
Available-for-sale, Less than 12 months, Estimated fair value	$ 0	$ 0
Available for sale, Less than 12 months Unrealized loss	0	0
Available for sale, 12 months and greater, Estimated fair value	1,230	3,129
Available for sale, 12 months and greater, Unrealized loss	(29)	(120)
Available for sale, Total Estimated fair value	1,230	3,129
Available for sale, Total Unrealized loss	$ (29)	$ (120)
Residential mortgage-backed securities
Available for sale at fair value:
Available for sale, Total number in a loss position | loan	11	31
Available-for-sale, Less than 12 months, Estimated fair value	$ 0	$ 4,445
Available for sale, Less than 12 months Unrealized loss	0	(23)
Available for sale, 12 months and greater, Estimated fair value	8,295	20,480
Available for sale, 12 months and greater, Unrealized loss	(145)	(597)
Available for sale, Total Estimated fair value	8,295	24,925
Available for sale, Total Unrealized loss	$ (145)	$ (620)
Held to maturity at cost:
Held to maturity, Total number in a loss position | loan	3	5
Held to maturity, Less than 12 months Estimated fair value	$ 0	$ 1,277
Held to maturity, Less than 12 months Unrealized loss	0	(15)
Held to maturity, 12 months and greater, Estimated fair value	905	821
Held to maturity, 12 months and greater, Unrealized loss	(12)	(37)
Held to maturity, Total Estimated fair value	905	2,098
Held to maturity, Total Unrealized loss	$ (12)	$ (52)
Commercial mortgage-backed securities
Held to maturity at cost:
Held to maturity, Total number in a loss position | loan	1	2
Held to maturity, Less than 12 months Estimated fair value	$ 0	$ 0
Held to maturity, Less than 12 months Unrealized loss	0	0
Held to maturity, 12 months and greater, Estimated fair value	1,509	3,432
Held to maturity, 12 months and greater, Unrealized loss	(39)	(138)
Held to maturity, Total Estimated fair value	1,509	3,432
Held to maturity, Total Unrealized loss	$ (39)	$ (138)
Corporate and other securities
Available for sale at fair value:
Available for sale, Total number in a loss position | loan	3	5
Available-for-sale, Less than 12 months, Estimated fair value	$ 0	$ 971
Available for sale, Less than 12 months Unrealized loss	0	(30)
Available for sale, 12 months and greater, Estimated fair value	3,694	5,787
Available for sale, 12 months and greater, Unrealized loss	(295)	(364)
Available for sale, Total Estimated fair value	3,694	6,758
Available for sale, Total Unrealized loss	$ (295)	$ (394)