Loans and Allowance for Loan Losses (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
Mar. 31, 2013	Dec. 31, 2012
Allowance for Loan Losses [Roll Forward]
Beginning balance	$ 6,258	$ 6,728
Charge-offs	(362)	(6,309)
Recoveries	25	32
Provision (recovery)	167	5,807
Ending balance	6,088	6,258
Additional information on allowance for loan losses and recorded investment in loans receivable [Abstract]
Ending balances individually evaluated for impairment	787	1,009
Ending balances collectively evaluated for impairment	5,301	5,249
Loans receivable, individually evaluated for impairment	18,560	17,065
Loans receivable, collectively evaluated for impairment	431,119	434,301
Loans receivable, ending balance	449,679	451,366
Commercial and Industrial [Member]
Allowance for Loan Losses [Roll Forward]
Beginning balance	932	795
Charge-offs	(256)	(526)
Recoveries	8	7
Provision (recovery)	58	656
Ending balance	742	932
Additional information on allowance for loan losses and recorded investment in loans receivable [Abstract]
Ending balances individually evaluated for impairment	168	428
Ending balances collectively evaluated for impairment	574	504
Loans receivable, individually evaluated for impairment	395	674
Loans receivable, collectively evaluated for impairment	24,214	26,466
Loans receivable, ending balance	24,609	27,140
Commercial Real Estate [Member]
Allowance for Loan Losses [Roll Forward]
Beginning balance	1,685	2,899
Charge-offs	0	(5,004)
Recoveries	0	9
Provision (recovery)	(16)	3,781
Ending balance	1,669	1,685
Additional information on allowance for loan losses and recorded investment in loans receivable [Abstract]
Ending balances individually evaluated for impairment	0	0
Ending balances collectively evaluated for impairment	1,669	1,685
Loans receivable, individually evaluated for impairment	11,000	9,612
Loans receivable, collectively evaluated for impairment	181,589	183,393
Loans receivable, ending balance	192,589	193,005
Construction and Land [Member]
Allowance for Loan Losses [Roll Forward]
Beginning balance	402	195
Charge-offs	0	0
Recoveries	0	0
Provision (recovery)	4	207
Ending balance	406	402
Additional information on allowance for loan losses and recorded investment in loans receivable [Abstract]
Ending balances individually evaluated for impairment	293	293
Ending balances collectively evaluated for impairment	113	109
Loans receivable, individually evaluated for impairment	4,150	4,175
Loans receivable, collectively evaluated for impairment	35,764	35,870
Loans receivable, ending balance	39,914	40,045
Consumer [Member]
Allowance for Loan Losses [Roll Forward]
Beginning balance	40	31
Charge-offs	(47)	(117)
Recoveries	17	14
Provision (recovery)	15	112
Ending balance	25	40
Additional information on allowance for loan losses and recorded investment in loans receivable [Abstract]
Ending balances individually evaluated for impairment	0	0
Ending balances collectively evaluated for impairment	25	40
Loans receivable, individually evaluated for impairment	2	4
Loans receivable, collectively evaluated for impairment	12,793	9,557
Loans receivable, ending balance	12,795	9,561
Residential Real Estate [Member]
Allowance for Loan Losses [Roll Forward]
Beginning balance	1,691	1,584
Charge-offs	0	(126)
Recoveries	0	2
Provision (recovery)	(133)	231
Ending balance	1,558	1,691
Additional information on allowance for loan losses and recorded investment in loans receivable [Abstract]
Ending balances individually evaluated for impairment	176	176
Ending balances collectively evaluated for impairment	1,382	1,515
Loans receivable, individually evaluated for impairment	2,449	2,372
Loans receivable, collectively evaluated for impairment	132,944	134,218
Loans receivable, ending balance	135,393	136,590
Home Equity Line of Credit [Member]
Allowance for Loan Losses [Roll Forward]
Beginning balance	1,336	698
Charge-offs	(59)	(536)
Recoveries	0	0
Provision (recovery)	212	1,174
Ending balance	1,489	1,336
Additional information on allowance for loan losses and recorded investment in loans receivable [Abstract]
Ending balances individually evaluated for impairment	150	112
Ending balances collectively evaluated for impairment	1,339	1,224
Loans receivable, individually evaluated for impairment	564	228
Loans receivable, collectively evaluated for impairment	43,815	44,797
Loans receivable, ending balance	44,379	45,025
Unallocated [Member]
Allowance for Loan Losses [Roll Forward]
Beginning balance	172	526
Charge-offs	0	0
Recoveries	0	0
Provision (recovery)	27	(354)
Ending balance	199	172
Additional information on allowance for loan losses and recorded investment in loans receivable [Abstract]
Ending balances individually evaluated for impairment	0	0
Ending balances collectively evaluated for impairment	$ 199	$ 172

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossAdditionalInformationAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

A valuation allowance for financing receivables that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of recovery of financing receivables doubtful of collection that were previously charged off.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(4)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of direct write-downs of financing receivables charged against the allowance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The balance of financing receivables that were collectively evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (h)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524

+ Details

Name:	us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The balance of financing receivables that were individually evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (h)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524

+ Details

Name:	us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher OTS

-Name Federal Regulation (FR)

-Number Title 12

-Section 563c.102

-Paragraph 8

-Subparagraph e

-Chapter V

-Subsection I

-LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

-Paragraph 116

-IssueDate 2006-05-01

-Chapter 8

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5074-111524

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 01-6

-Paragraph 13

-Subparagraph e

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Name:	us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The sum of the periodic provision charged to earnings, based on an assessment of uncollectibility from the counterparty on account of loan, lease or other credit losses, to reduce these accounts to the amount that approximates their net realizable value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 11

-Article 9

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

-Paragraph 168, 169, 170

-IssueDate 2006-05-01

-Chapter 5

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.11)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

+ Details

Name:	us-gaap_ProvisionForLoanLeaseAndOtherLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration