Loans (Details 12) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Troubled debt restructurings class modification
TDRs Greater than 30 Days Past Due and Still Accruing	$ 28	$ 803
TDRs on Nonaccrual	233	4,114
Total TDRs Not Performing to Modified Terms	261	4,917
Total TDRs Performing to Modified Terms	10,656	6,980
Commercial | Multiple modifications
Troubled debt restructurings class modification
Total TDRs Performing to Modified Terms	46	18
Commercial | Extended maturity
Troubled debt restructurings class modification
TDRs on Nonaccrual		3,558
Total TDRs Not Performing to Modified Terms		3,558
Total TDRs Performing to Modified Terms		344
Residential real estate: | Secured by first liens | Multiple modifications
Troubled debt restructurings class modification
TDRs Greater than 30 Days Past Due and Still Accruing	28	220
Total TDRs Not Performing to Modified Terms	28	220
Total TDRs Performing to Modified Terms	978	30
Residential real estate: | Secured by first liens | Extended maturity
Troubled debt restructurings class modification
TDRs on Nonaccrual	64
Total TDRs Not Performing to Modified Terms	64
Total TDRs Performing to Modified Terms	1,949	477
Residential real estate: | Secured by first liens | Interest rate reduction
Troubled debt restructurings class modification
TDRs Greater than 30 Days Past Due and Still Accruing		583
Total TDRs Not Performing to Modified Terms		583
Total TDRs Performing to Modified Terms	318	324
Residential real estate: | Home equity | Multiple modifications
Troubled debt restructurings class modification
Total TDRs Performing to Modified Terms	629	648
Construction | Multiple modifications
Troubled debt restructurings class modification
Total TDRs Performing to Modified Terms	2,504	2,559
Construction | Interest only payments
Troubled debt restructurings class modification
TDRs on Nonaccrual		556
Total TDRs Not Performing to Modified Terms		556
Construction | Extended maturity
Troubled debt restructurings class modification
Total TDRs Performing to Modified Terms	98	115
Construction | Interest rate reduction
Troubled debt restructurings class modification
Total TDRs Performing to Modified Terms		1,386
Commercial real estate: | Owner occupied nonfarm/nonresidential Interest only payments
Troubled debt restructurings class modification
Total TDRs Performing to Modified Terms	171	180
Commercial real estate: | Other non farm and non residential multiple modifications
Troubled debt restructurings class modification
TDRs on Nonaccrual	169
Total TDRs Not Performing to Modified Terms	169
Total TDRs Performing to Modified Terms	815	348
Commercial real estate: | Other Non farm and non residential extended maturity
Troubled debt restructurings class modification
Total TDRs Performing to Modified Terms	$ 3,148	$ 551