Securities - Schedule of Marketable Securities in Unrealized Loss Position (Details) $ in Thousands	Sep. 30, 2019 USD ($) loan	Dec. 31, 2018 USD ($) loan
Available for sale:
Temporarily impaired securities, Total number in a loss position | loan	22	45
Temporarily impaired securities, Less than 12 months, Estimated fair value	$ 9,502	$ 5,416
Temporarily impaired securities, Less than 12 months, Unrealized loss	(23)	(53)
Temporarily impaired securities, 12 months and greater, Estimated fair value	12,266	35,038
Temporarily impaired securities,12 months and greater, Unrealized loss	(406)	(1,197)
Temporarily impaired securities, Total estimated fair value	21,768	40,454
Temporarily impaired securities, Total unrealized loss	$ (429)	$ (1,250)
Held to maturity:
Temporarily impaired securities, Total number in a loss position | loan	5	9
Temporarily impaired securities, Less than 12 months, Estimated fair value	$ 3,782	$ 1,277
Temporarily impaired securities, Less than 12 months, Unrealized loss	(44)	(15)
Temporarily impaired securities, 12 months and greater, Estimated fair value	772	6,687
Temporarily impaired securities, 12 months and greater, Unrealized loss	(8)	(269)
Temporarily impaired securities, Total estimated fair value	4,554	7,964
Temporarily impaired securities, Total unrealized loss	$ (52)	$ (284)
U.S. Government sponsored entities
Available for sale:
Temporarily impaired securities, Total number in a loss position | loan	5	5
Temporarily impaired securities, Less than 12 months, Estimated fair value	$ 2,755	$ 0
Temporarily impaired securities, Less than 12 months, Unrealized loss	0	0
Temporarily impaired securities, 12 months and greater, Estimated fair value	2,987	5,642
Temporarily impaired securities,12 months and greater, Unrealized loss	(11)	(116)
Temporarily impaired securities, Total estimated fair value	5,742	5,642
Temporarily impaired securities, Total unrealized loss	$ (11)	$ (116)
Held to maturity:
Temporarily impaired securities, Total number in a loss position | loan	2	2
Temporarily impaired securities, Less than 12 months, Estimated fair value	$ 2,278	$ 0
Temporarily impaired securities, Less than 12 months, Unrealized loss	(20)	0
Temporarily impaired securities, 12 months and greater, Estimated fair value	0	2,434
Temporarily impaired securities, 12 months and greater, Unrealized loss	0	(94)
Temporarily impaired securities, Total estimated fair value	2,278	2,434
Temporarily impaired securities, Total unrealized loss	$ (20)	$ (94)
State and political subdivisions
Available for sale:
Temporarily impaired securities, Total number in a loss position | loan	1	4
Temporarily impaired securities, Less than 12 months, Estimated fair value	$ 0	$ 0
Temporarily impaired securities, Less than 12 months, Unrealized loss	0	0
Temporarily impaired securities, 12 months and greater, Estimated fair value	1,143	3,129
Temporarily impaired securities,12 months and greater, Unrealized loss	(16)	(120)
Temporarily impaired securities, Total estimated fair value	1,143	3,129
Temporarily impaired securities, Total unrealized loss	$ (16)	$ (120)
Residential mortgage-backed securities
Available for sale:
Temporarily impaired securities, Total number in a loss position | loan	11	31
Temporarily impaired securities, Less than 12 months, Estimated fair value	$ 3,532	$ 4,445
Temporarily impaired securities, Less than 12 months, Unrealized loss	(15)	(23)
Temporarily impaired securities, 12 months and greater, Estimated fair value	4,431	20,480
Temporarily impaired securities,12 months and greater, Unrealized loss	(96)	(597)
Temporarily impaired securities, Total estimated fair value	7,963	24,925
Temporarily impaired securities, Total unrealized loss	$ (111)	$ (620)
Held to maturity:
Temporarily impaired securities, Total number in a loss position | loan	2	5
Temporarily impaired securities, Less than 12 months, Estimated fair value	$ 0	$ 1,277
Temporarily impaired securities, Less than 12 months, Unrealized loss	0	(15)
Temporarily impaired securities, 12 months and greater, Estimated fair value	772	821
Temporarily impaired securities, 12 months and greater, Unrealized loss	(8)	(37)
Temporarily impaired securities, Total estimated fair value	772	2,098
Temporarily impaired securities, Total unrealized loss	$ (8)	$ (52)
Commercial mortgage-backed securities
Held to maturity:
Temporarily impaired securities, Total number in a loss position | loan	1	2
Temporarily impaired securities, Less than 12 months, Estimated fair value	$ 1,504	$ 0
Temporarily impaired securities, Less than 12 months, Unrealized loss	(24)	0
Temporarily impaired securities, 12 months and greater, Estimated fair value	0	3,432
Temporarily impaired securities, 12 months and greater, Unrealized loss	0	(138)
Temporarily impaired securities, Total estimated fair value	1,504	3,432
Temporarily impaired securities, Total unrealized loss	$ (24)	$ (138)
Corporate and other securities
Available for sale:
Temporarily impaired securities, Total number in a loss position | loan	5	5
Temporarily impaired securities, Less than 12 months, Estimated fair value	$ 3,215	$ 971
Temporarily impaired securities, Less than 12 months, Unrealized loss	(8)	(30)
Temporarily impaired securities, 12 months and greater, Estimated fair value	3,705	5,787
Temporarily impaired securities,12 months and greater, Unrealized loss	(283)	(364)
Temporarily impaired securities, Total estimated fair value	6,920	6,758
Temporarily impaired securities, Total unrealized loss	$ (291)	$ (394)