Securities (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2017 USD ($) Security	Sep. 30, 2017 USD ($) Security	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Amortized cost and fair value of investment securities Available-for-sale [Abstract]
Amortized Cost	$ 3,135	$ 3,135
AFS Securities	3,129	3,129		$ 0
Amortized cost and fair value of investment securities held to maturity [Abstract]
Amortized Cost	58,764	58,764		62,757
Unrealized Gains	340	340		352
Unrealized Losses	145	145		282
Fair Value	58,959	58,959		62,827
Fair Value [Abstract]
Less than 12 Months, Estimated Fair Value	15,687	15,687		28,459
12 Months or More, Estimated Fair Value	14,506	14,506		0
Total, Estimated Fair Value	30,193	30,193		28,459
Unrealized Losses [Abstract]
Less than 12 Months, Unrealized Losses	41	41		282
12 Months or More, Unrealized Losses	104	104		0
Total, Unrealized Losses	$ 145	$ 145		282
AFS securities, Number of securities in continuous unrealized loss position less than twelve months | Security	3	3
AFS securities, amount of largest loss recorded in one security	$ 3	$ 3
HTM securities, Number of securities in continuous unrealized loss position | Security	21	21
HTM securities, Amount of largest loss recorded in one security	$ 29	$ 29
Amortized Cost [Abstract]
Due in one year or less	0	0
Due after one through five years	3,135	3,135
Due after five years through ten years	0	0
Mortgage-backed securities	0	0
Amortized Cost	3,135	3,135
Estimated Fair Value [Abstract]
Due in one year or less	0	0
Due after one through five years	3,129	3,129
Due after five years through ten years	0	0
Mortgage-backed securities	0	0
Fair Value	3,129	3,129		0
Amortized Cost [Abstract]
Due in one year or less	10,009	10,009
Due after one through five years	15,030	15,030
Due after five years through ten years	1,965	1,965
Mortgage-backed securities	31,760	31,760
Amortized Cost	58,764	58,764		62,757
Estimated Fair Value [Abstract]
Due in one year or less	10,014	10,014
Due after one through five years	15,112	15,112
Due after five years through ten years	2,078	2,078
Mortgage-backed securities	31,755	31,755
Fair Value	58,959	58,959		62,827
Gross gain (loss) on the sale of securities	4	(2)	$ 0
U.S. Treasury Securities [Member]
Amortized cost and fair value of investment securities held to maturity [Abstract]
Amortized Cost	7,996	7,996		12,998
Unrealized Gains	106	106		167
Unrealized Losses	0	0		0
Fair Value	8,102	8,102		13,165
Amortized Cost [Abstract]
Amortized Cost	7,996	7,996		12,998
Estimated Fair Value [Abstract]
Fair Value	8,102	8,102		13,165
U.S. Government Agency Notes [Member]
Amortized cost and fair value of investment securities Available-for-sale [Abstract]
Amortized Cost	3,135	3,135
Unrealized Gains	0	0
Unrealized Losses	6	6
AFS Securities	3,129	3,129
Amortized cost and fair value of investment securities held to maturity [Abstract]
Amortized Cost	19,008	19,008		20,027
Unrealized Gains	137	137		133
Unrealized Losses	43	43		54
Fair Value	19,102	19,102		20,106
Fair Value [Abstract]
Less than 12 Months, Estimated Fair Value	4,000	4,000		5,002
12 Months or More, Estimated Fair Value	7,005	7,005		0
Total, Estimated Fair Value	11,005	11,005		5,002
Unrealized Losses [Abstract]
Less than 12 Months, Unrealized Losses	2	2		54
12 Months or More, Unrealized Losses	41	41		0
Total, Unrealized Losses	43	43		54
Amortized Cost [Abstract]
Amortized Cost	3,135	3,135
Estimated Fair Value [Abstract]
Fair Value	3,129	3,129
Amortized Cost [Abstract]
Amortized Cost	19,008	19,008		20,027
Estimated Fair Value [Abstract]
Fair Value	19,102	19,102		20,106
Mortgage-backed Securities [Member]
Amortized cost and fair value of investment securities held to maturity [Abstract]
Amortized Cost	31,760	31,760		29,732
Unrealized Gains	97	97		52
Unrealized Losses	102	102		228
Fair Value	31,755	31,755		29,556
Fair Value [Abstract]
Less than 12 Months, Estimated Fair Value	11,687	11,687		23,457
12 Months or More, Estimated Fair Value	7,501	7,501		0
Total, Estimated Fair Value	19,188	19,188		23,457
Unrealized Losses [Abstract]
Less than 12 Months, Unrealized Losses	39	39		228
12 Months or More, Unrealized Losses	63	63		0
Total, Unrealized Losses	102	102		228
Amortized Cost [Abstract]
Amortized Cost	31,760	31,760		29,732
Estimated Fair Value [Abstract]
Fair Value	$ 31,755	$ 31,755		$ 29,556