Securities - Schedule of Amortized Cost and Fair Value by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Available for Sale Amortized Cost
1 year or less	$ 8,002
Over 1 year through 5 years	107,334
Over 5 years through 10 years	10,881
Over 10 years	70
Total amortized cost	158,625	$ 160,290
Available for Sale Fair Value
1 year or less	7,981
Over 1 year through 5 years	104,738
Over 5 years through 10 years	10,660
Over 10 years	69
Total securities available for sale	155,620	159,051
Held-to-Maturity Amortized Cost
1 year or less	10,000
Over 1 year through 5 years	7,000
Over 5 years through 10 years	0
Over 10 years	0
Total amortized costs	41,378	44,829	$ 53,794
Held-to-Maturity Fair Value
1 year or less	9,954
Over 1 year through 5 years	6,914
Over 5 years through 10 years	0
Over 10 years	0
Securities held to maturity, fair value	40,758	44,549	$ 53,661
Mortgage-backed securities, residential
Available for Sale Amortized Cost
Without single maturity date	32,338
Total amortized cost	32,338	34,473
Available for Sale Fair Value
Without single maturity date	32,172
Total securities available for sale	32,172	34,833
Held-to-Maturity Amortized Cost
Without single maturity date	24,378
Total amortized costs	24,378	25,829
Held-to-Maturity Fair Value
Without single maturity date	23,890
Securities held to maturity, fair value	$ 23,890	$ 25,646