Loans, Impaired Loan (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Recorded Investment [Abstract]
Impaired loan, with no related allowance, recorded investment	$ 3,365	$ 2,277
Impaired loan, with an related allowance, recorded investment	3,705	3,752
Impaired loan, total, recorded investment	7,070	6,029
Unpaid Principal Balance [Abstract]
Impaired loan, with no related allowance, unpaid principal balance	3,382	2,285
Impaired loan, with an related allowance, unpaid principal balance	3,752	3,789
Impaired loan, total, unpaid principal balance	7,134	6,074
Related Allowance [Abstract]
Impaired loan, with no related allowance	0	0
Impaired loan, with related allowance	574	559
Impaired loan, total, related allowance	574	559
Average Recorded Investment [Abstract]
Impaired loan, with no related allowance, average recorded investment	3,513	2,864
Impaired loan, with related allowance, average recorded investment	3,720	2,768
Impaired loan, total, average recorded investment	7,233	5,632
Interest Income Recognized [Abstract]
Impaired loan, with no related allowance, interest income recognized	1	29
Impaired loan, with related allowance, interest income recognized	10	41
Impaired loan, total, interest income recognized	11	70
Commercial [Member]
Recorded Investment [Abstract]
Impaired loan, with no related allowance, recorded investment	16	19
Impaired loan, with an related allowance, recorded investment	0	0
Impaired loan, total, recorded investment	16	19
Unpaid Principal Balance [Abstract]
Impaired loan, with no related allowance, unpaid principal balance	16	19
Impaired loan, with an related allowance, unpaid principal balance	0	0
Impaired loan, total, unpaid principal balance	16	19
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	14	20
Impaired loan, with related allowance, average recorded investment	0	0
Impaired loan, total, average recorded investment	14	20
Interest Income Recognized [Abstract]
Impaired loan, with no related allowance, interest income recognized	0	1
Impaired loan, with related allowance, interest income recognized	0	0
Impaired loan, total, interest income recognized	0	1
Commercial real estate, portfolio [Member] | Construction and land development [Member]
Recorded Investment [Abstract]
Impaired loan, with no related allowance, recorded investment	63	18
Impaired loan, with an related allowance, recorded investment	1,453	1,468
Impaired loan, total, recorded investment	1,516	1,486
Unpaid Principal Balance [Abstract]
Impaired loan, with no related allowance, unpaid principal balance	63	18
Impaired loan, with an related allowance, unpaid principal balance	1,496	1,507
Impaired loan, total, unpaid principal balance	1,559	1,525
Related Allowance [Abstract]
Impaired loan, with no related allowance	0	0
Impaired loan, with related allowance	88	68
Impaired loan, total, related allowance	88	68
Average Recorded Investment [Abstract]
Impaired loan, with no related allowance, average recorded investment	64	261
Impaired loan, with related allowance, average recorded investment	1,456	1,551
Impaired loan, total, average recorded investment	1,520	1,812
Interest Income Recognized [Abstract]
Impaired loan, with no related allowance, interest income recognized	0	4
Impaired loan, with related allowance, interest income recognized	8	33
Impaired loan, total, interest income recognized	8	37
Commercial real estate, portfolio [Member] | Commercial real estate [Member]
Recorded Investment [Abstract]
Impaired loan, with no related allowance, recorded investment	1,942	936
Impaired loan, with an related allowance, recorded investment	2,231	2,266
Impaired loan, total, recorded investment	4,173	3,202
Unpaid Principal Balance [Abstract]
Impaired loan, with no related allowance, unpaid principal balance	1,955	936
Impaired loan, with an related allowance, unpaid principal balance	2,239	2,264
Impaired loan, total, unpaid principal balance	4,194	3,200
Related Allowance [Abstract]
Impaired loan, with no related allowance	0	0
Impaired loan, with related allowance	483	488
Impaired loan, total, related allowance	483	488
Average Recorded Investment [Abstract]
Impaired loan, with no related allowance, average recorded investment	2,063	950
Impaired loan, with related allowance, average recorded investment	2,246	1,198
Impaired loan, total, average recorded investment	4,309	2,148
Interest Income Recognized [Abstract]
Impaired loan, with no related allowance, interest income recognized	1	13
Impaired loan, with related allowance, interest income recognized	2	7
Impaired loan, total, interest income recognized	3	20
Residential real estate, portfolio [Member] | Residential [Member]
Recorded Investment [Abstract]
Impaired loan, with no related allowance, recorded investment	932	880
Impaired loan, with an related allowance, recorded investment	4	0
Impaired loan, total, recorded investment	936	880
Unpaid Principal Balance [Abstract]
Impaired loan, with no related allowance, unpaid principal balance	936	888
Impaired loan, with an related allowance, unpaid principal balance	0	0
Impaired loan, total, unpaid principal balance	936	888
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	956	1,200
Impaired loan, with related allowance, average recorded investment	0	0
Impaired loan, total, average recorded investment	956	1,200
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
Residential real estate, portfolio [Member] | Home equity [Member]
Recorded Investment [Abstract]
Impaired loan, with no related allowance, recorded investment	409	424
Impaired loan, with an related allowance, recorded investment	0	0
Impaired loan, total, recorded investment	409	424
Unpaid Principal Balance [Abstract]
Impaired loan, with no related allowance, unpaid principal balance	409	424
Impaired loan, with an related allowance, unpaid principal balance	0	0
Impaired loan, total, unpaid principal balance	409	424
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	413	433
Impaired loan, with related allowance, average recorded investment	0	0
Impaired loan, total, average recorded investment	413	433
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	3	0
Impaired loan, with an related allowance, recorded investment	17	18
Impaired loan, total, recorded investment	20	18
Unpaid Principal Balance [Abstract]
Impaired loan, with no related allowance, unpaid principal balance	3	0
Impaired loan, with an related allowance, unpaid principal balance	17	18
Impaired loan, total, unpaid principal balance	20	18
Related Allowance [Abstract]
Impaired loan, with no related allowance	0	0
Impaired loan, with related allowance	3	3
Impaired loan, total, related allowance	3	3
Average Recorded Investment [Abstract]
Impaired loan, with no related allowance, average recorded investment	3	0
Impaired loan, with related allowance, average recorded investment	18	19
Impaired loan, total, average recorded investment	21	19
Interest Income Recognized [Abstract]
Impaired loan, with no related allowance, interest income recognized	0	0
Impaired loan, with related allowance, interest income recognized	0	1
Impaired loan, total, interest income recognized	$ 0	$ 1