Securities - Schedule of Amortized Cost and Fair Value by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Available for Sale Amortized Cost
1 year or less	$ 6,576
Over 1 year through 5 years	97,681
Over 5 years through 10 years	15,709
Over 10 years	0
Total amortized cost	158,330	$ 143,393
Available for Sale Fair Value
1 year or less	6,589
Over 1 year through 5 years	96,972
Over 5 years through 10 years	15,681
Over 10 years	0
Total securities available for sale	158,392	142,990	$ 143,940
Held-to-Maturity Amortized Cost
1 year or less	8,004
Over 1 year through 5 years	12,000
Over 5 years through 10 years	0
Over 10 years	0
Total amortized costs	47,369	55,568	57,562
Held-to-Maturity Fair Value
1 year or less	7,998
Over 1 year through 5 years	11,977
Over 5 years through 10 years	0
Over 10 years	0
Securities held to maturity, fair value	47,373	55,425	$ 58,566
Mortgage-backed securities, residential
Available for Sale Amortized Cost
Without single maturity date	36,673
Total amortized cost	36,673	31,272
Available for Sale Fair Value
Without single maturity date	37,351
Total securities available for sale	37,351	31,973
Held-to-Maturity Amortized Cost
Without single maturity date	27,365
Total amortized costs	27,365	32,551
Held-to-Maturity Fair Value
Without single maturity date	27,398
Securities held to maturity, fair value	27,398	32,436
CRA mutual fund
Available for Sale Amortized Cost
Without single maturity date	1,044
Total amortized cost	1,044	1,044
Available for Sale Fair Value
Without single maturity date	1,042
Total securities available for sale	1,042	1,035
Held-to-Maturity Amortized Cost
Without single maturity date	0
Held-to-Maturity Fair Value
Without single maturity date	0
Stock in other banks
Available for Sale Amortized Cost
Without single maturity date	647
Total amortized cost	647	498
Available for Sale Fair Value
Without single maturity date	757
Total securities available for sale	757	$ 681
Held-to-Maturity Amortized Cost
Without single maturity date	0
Held-to-Maturity Fair Value
Without single maturity date	$ 0