Loans, Impaired Loan (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Recorded Investment [Abstract]
Impaired loan, with no related allowance, recorded investment	$ 1,429	$ 2,916
Impaired loan, with an related allowance, recorded investment	1,968	131
Impaired loan, total, recorded investment	3,397	3,047
Unpaid Principal Balance [Abstract]
Impaired loan, with no related allowance, unpaid principal balance	1,720	3,221
Impaired loan, with an related allowance, unpaid principal balance	2,007	131
Impaired loan, total, unpaid principal balance	3,727	3,352
Related Allowance [Abstract]
Impaired loan, with no related allowance	0	0
Impaired loan, with related allowance	454	128
Impaired loan, total, related allowance	454	128
Average Recorded Investment [Abstract]
Impaired loan, with no related allowance, average recorded investment	1,542	3,256
Impaired loan, with related allowance, average recorded investment	2,067	45
Impaired loan, total, average recorded investment	3,609	3,301
Interest Income Recognized [Abstract]
Impaired loan, with no related allowance, interest income recognized	7	34
Impaired loan, with related allowance, interest income recognized	0	0
Impaired loan, total, interest income recognized	7	34
Commercial [Member]
Recorded Investment [Abstract]
Impaired loan, with no related allowance, recorded investment	0	39
Impaired loan, with an related allowance, recorded investment	10	110
Impaired loan, total, recorded investment	10	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	10	110
Impaired loan, total, unpaid principal balance	10	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	0	0
Impaired loan, total, interest income recognized	0	11
Commercial real estate, portfolio [Member] | Construction and land development [Member]
Recorded Investment [Abstract]
Impaired loan, with no related allowance, recorded investment	825	2,302
Impaired loan, with an related allowance, recorded investment	890
Impaired loan, total, recorded investment	1,715	2,302
Unpaid Principal Balance [Abstract]
Impaired loan, with no related allowance, unpaid principal balance	837	2,335
Impaired loan, with an related allowance, unpaid principal balance	929
Impaired loan, total, unpaid principal balance	1,766	2,335
Related Allowance [Abstract]
Impaired loan, with no related allowance	0	0
Impaired loan, with related allowance	82
Impaired loan, total, related allowance	82	0
Average Recorded Investment [Abstract]
Impaired loan, with no related allowance, average recorded investment	939	1,562
Impaired loan, with related allowance, average recorded investment	988
Impaired loan, total, average recorded investment	1,927	1,562
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
Commercial real estate, portfolio [Member] | Commercial real estate [Member]
Recorded Investment [Abstract]
Impaired loan, with no related allowance, recorded investment	333	305
Impaired loan, with an related allowance, recorded investment	959
Impaired loan, total, recorded investment	1,292	305
Unpaid Principal Balance [Abstract]
Impaired loan, with no related allowance, unpaid principal balance	334	306
Impaired loan, with an related allowance, unpaid principal balance	959
Impaired loan, total, unpaid principal balance	1,293	306
Related Allowance [Abstract]
Impaired loan, with no related allowance	0	0
Impaired loan, with related allowance	331
Impaired loan, total, related allowance	331	0
Average Recorded Investment [Abstract]
Impaired loan, with no related allowance, average recorded investment	327	557
Impaired loan, with related allowance, average recorded investment	959
Impaired loan, total, average recorded investment	1,286	557
Interest Income Recognized [Abstract]
Impaired loan, with no related allowance, interest income recognized	7	8
Impaired loan, with related allowance, interest income recognized	0	0
Impaired loan, total, interest income recognized	7	8
Residential real estate, portfolio [Member] | Residential [Member]
Recorded Investment [Abstract]
Impaired loan, with no related allowance, recorded investment	261	270
Impaired loan, with an related allowance, recorded investment	90
Impaired loan, total, recorded investment	351	270
Unpaid Principal Balance [Abstract]
Impaired loan, with no related allowance, unpaid principal balance	539	541
Impaired loan, with an related allowance, unpaid principal balance	90
Impaired loan, total, unpaid principal balance	629	541
Related Allowance [Abstract]
Impaired loan, with no related allowance	0	0
Impaired loan, with related allowance	15
Impaired loan, total, related allowance	15	0
Average Recorded Investment [Abstract]
Impaired loan, with no related allowance, average recorded investment	265	861
Impaired loan, with related allowance, average recorded investment	90
Impaired loan, total, average recorded investment	355	861
Interest Income Recognized [Abstract]
Impaired loan, with no related allowance, interest income recognized	0	15
Impaired loan, with related allowance, interest income recognized	0	0
Impaired loan, total, interest income recognized	0	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	11	0
Impaired loan, with related allowance, average recorded investment	0	0
Impaired loan, total, average recorded investment	11	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	0	0
Impaired loan, total, interest income recognized	$ 0	$ 0