Loans, Net - Recorded investment in nonaccrual loans and loans past due and still accruing by class of loans (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	$ 8,827	$ 9,944
Past due 90 days or more and still accruing	224	30
Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	212	247
Past due 90 days or more and still accruing	0	0
Secured by 1-4 family residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	5,058	4,932
Past due 90 days or more and still accruing	224	0
Other real estate loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	1,187	1,472
Past due 90 days or more and still accruing	0	0
Commercial loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	68	290
Past due 90 days or more and still accruing	0	30
Consumer loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	2,302	3,003
Past due 90 days or more and still accruing	$ 0	$ 0