Loans, Impaired Loan (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Recorded Investment [Abstract]
Impaired loan, with no related allowance, recorded investment	$ 1,780	$ 2,916
Impaired loan, with an related allowance, recorded investment	1,584	131
Impaired loan, total, recorded investment	3,364	3,047
Unpaid Principal Balance [Abstract]
Impaired loan, with no related allowance, unpaid principal balance	2,092	3,221
Impaired loan, with an related allowance, unpaid principal balance	1,606	131
Impaired loan, total, unpaid principal balance	3,698	3,352
Related Allowance [Abstract]
Impaired loan, with no related allowance	0	0
Impaired loan, with related allowance	437	128
Impaired loan, total, related allowance	437	128
Average Recorded Investment [Abstract]
Impaired loan, with no related allowance, average recorded investment	1,877	3,256
Impaired loan, with related allowance, average recorded investment	1,654	45
Impaired loan, total, average recorded investment	3,531	3,301
Interest Income Recognized [Abstract]
Impaired loan, with no related allowance, interest income recognized	47	34
Impaired loan, with related allowance, interest income recognized	2	0
Impaired loan, total, interest income recognized	49	34
Commercial [Member]
Recorded Investment [Abstract]
Impaired loan, with no related allowance, recorded investment	0	39
Impaired loan, with an related allowance, recorded investment	9	110
Impaired loan, total, recorded investment	9	149
Unpaid Principal Balance [Abstract]
Impaired loan, with no related allowance, unpaid principal balance	0	39
Impaired loan, with an related allowance, unpaid principal balance	9	110
Impaired loan, total, unpaid principal balance	9	149
Related Allowance [Abstract]
Impaired loan, with no related allowance	0	0
Impaired loan, with related allowance	7	107
Impaired loan, total, related allowance	7	107
Average Recorded Investment [Abstract]
Impaired loan, with no related allowance, average recorded investment	0	276
Impaired loan, with related allowance, average recorded investment	10	35
Impaired loan, total, average recorded investment	10	311
Interest Income Recognized [Abstract]
Impaired loan, with no related allowance, interest income recognized	0	11
Impaired loan, with related allowance, interest income recognized	1	0
Impaired loan, total, interest income recognized	1	11
Commercial real estate, portfolio [Member] | Construction and land development [Member]
Recorded Investment [Abstract]
Impaired loan, with no related allowance, recorded investment	980	2,302
Impaired loan, with an related allowance, recorded investment	524	0
Impaired loan, total, recorded investment	1,504	2,302
Unpaid Principal Balance [Abstract]
Impaired loan, with no related allowance, unpaid principal balance	997	2,335
Impaired loan, with an related allowance, unpaid principal balance	546	0
Impaired loan, total, unpaid principal balance	1,543	2,335
Related Allowance [Abstract]
Impaired loan, with no related allowance	0	0
Impaired loan, with related allowance	81	0
Impaired loan, total, related allowance	81	0
Average Recorded Investment [Abstract]
Impaired loan, with no related allowance, average recorded investment	1,070	1,562
Impaired loan, with related allowance, average recorded investment	576	0
Impaired loan, total, average recorded investment	1,646	1,562
Interest Income Recognized [Abstract]
Impaired loan, with no related allowance, interest income recognized	27	0
Impaired loan, with related allowance, interest income recognized	0	0
Impaired loan, total, interest income recognized	27	0
Commercial real estate, portfolio [Member] | Commercial real estate [Member]
Recorded Investment [Abstract]
Impaired loan, with no related allowance, recorded investment	328	305
Impaired loan, with an related allowance, recorded investment	944	0
Impaired loan, total, recorded investment	1,272	305
Unpaid Principal Balance [Abstract]
Impaired loan, with no related allowance, unpaid principal balance	328	306
Impaired loan, with an related allowance, unpaid principal balance	944	0
Impaired loan, total, unpaid principal balance	1,272	306
Related Allowance [Abstract]
Impaired loan, with no related allowance	0	0
Impaired loan, with related allowance	316	0
Impaired loan, total, related allowance	316	0
Average Recorded Investment [Abstract]
Impaired loan, with no related allowance, average recorded investment	326	557
Impaired loan, with related allowance, average recorded investment	959	0
Impaired loan, total, average recorded investment	1,285	557
Interest Income Recognized [Abstract]
Impaired loan, with no related allowance, interest income recognized	12	8
Impaired loan, with related allowance, interest income recognized	0	0
Impaired loan, total, interest income recognized	12	8
Residential real estate, portfolio [Member] | Residential [Member]
Recorded Investment [Abstract]
Impaired loan, with no related allowance, recorded investment	462	270
Impaired loan, with an related allowance, recorded investment	88	0
Impaired loan, total, recorded investment	550	270
Unpaid Principal Balance [Abstract]
Impaired loan, with no related allowance, unpaid principal balance	757	541
Impaired loan, with an related allowance, unpaid principal balance	88	0
Impaired loan, total, unpaid principal balance	845	541
Related Allowance [Abstract]
Impaired loan, with no related allowance	0	0
Impaired loan, with related allowance	14	0
Impaired loan, total, related allowance	14	0
Average Recorded Investment [Abstract]
Impaired loan, with no related allowance, average recorded investment	471	861
Impaired loan, with related allowance, average recorded investment	89	0
Impaired loan, total, average recorded investment	560	861
Interest Income Recognized [Abstract]
Impaired loan, with no related allowance, interest income recognized	8	15
Impaired loan, with related allowance, interest income recognized	0	0
Impaired loan, total, interest income recognized	8	15
Residential real estate, portfolio [Member] | Home equity [Member]
Recorded Investment [Abstract]
Impaired loan, with no related allowance, recorded investment	10	0
Impaired loan, with an related allowance, recorded investment	0	0
Impaired loan, total, recorded investment	10	0
Unpaid Principal Balance [Abstract]
Impaired loan, with no related allowance, unpaid principal balance	10	0
Impaired loan, with an related allowance, unpaid principal balance	0	0
Impaired loan, total, unpaid principal balance	10	0
Related Allowance [Abstract]
Impaired loan, with no related allowance	0	0
Impaired loan, with related allowance	0	0
Impaired loan, total, related allowance	0	0
Average Recorded Investment [Abstract]
Impaired loan, with no related allowance, average recorded investment	10	0
Impaired loan, with related allowance, average recorded investment	0	0
Impaired loan, total, average recorded investment	10	0
Interest Income Recognized [Abstract]
Impaired loan, with no related allowance, interest income recognized	0	0
Impaired loan, with related allowance, interest income recognized	0	0
Impaired loan, total, interest income recognized	0	0
Consumer [Member]
Recorded Investment [Abstract]
Impaired loan, with no related allowance, recorded investment	0	0
Impaired loan, with an related allowance, recorded investment	19	21
Impaired loan, total, recorded investment	19	21
Unpaid Principal Balance [Abstract]
Impaired loan, with no related allowance, unpaid principal balance	0	0
Impaired loan, with an related allowance, unpaid principal balance	19	21
Impaired loan, total, unpaid principal balance	19	21
Related Allowance [Abstract]
Impaired loan, with no related allowance	0	0
Impaired loan, with related allowance	19	21
Impaired loan, total, related allowance	19	21
Average Recorded Investment [Abstract]
Impaired loan, with no related allowance, average recorded investment	0	0
Impaired loan, with related allowance, average recorded investment	20	10
Impaired loan, total, average recorded investment	20	10
Interest Income Recognized [Abstract]
Impaired loan, with no related allowance, interest income recognized	0	0
Impaired loan, with related allowance, interest income recognized	1	0
Impaired loan, total, interest income recognized	$ 1	$ 0