Loans, Net - Recorded investment in nonaccrual loans and loans past due and still accruing by class of loans (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	$ 6,703	$ 8,784
Past due 90 days or more and still accruing	248	278
Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	29	204
Past due 90 days or more and still accruing	11	0
Secured by 1-4 family residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	3,308	4,460
Past due 90 days or more and still accruing	0	0
Other real estate loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	1,089	1,186
Past due 90 days or more and still accruing	148	248
Commercial loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	406	1,036
Past due 90 days or more and still accruing	89	30
Consumer loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	1,871	1,898
Past due 90 days or more and still accruing	$ 0	$ 0