Loans - Balance In ALLL And Recorded Investment In Loans By Portfolio Segment And Based On Impairment Method (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	$ 842	$ 830
Collectively evaluated for impairment	4,840	4,407
Total ending allowance balance	5,682	5,237
Individually evaluated for impairment	8,971	9,854
Collectively evaluated for impairment	163,510	148,426
Subtotal	172,481	158,280
Commercial Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	562	609
Collectively evaluated for impairment	847	702
Total ending allowance balance	1,409	1,311	1,802	2,281
Individually evaluated for impairment	988	1,091
Collectively evaluated for impairment	27,536	24,317
Subtotal	28,524	25,408
Construction Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	1
Total ending allowance balance	1
Collectively evaluated for impairment	79	14
Subtotal	79	14
Real Estate [Member] \| Commercial Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	152	126
Collectively evaluated for impairment	2,045	1,820
Total ending allowance balance	2,197	1,946	1,912	1,863
Individually evaluated for impairment	5,728	6,467
Collectively evaluated for impairment	50,704	47,824
Subtotal	56,432	54,291
Real Estate [Member] \| Single-family residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	44	71
Collectively evaluated for impairment	195	261
Total ending allowance balance	239	332	190	207
Individually evaluated for impairment	128	129
Collectively evaluated for impairment	46,490	42,929
Subtotal	46,618	43,058
Real Estate [Member] \| Multi-family residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	84	24
Collectively evaluated for impairment	1,520	1,372
Total ending allowance balance	1,604	1,396	1,446	1,470
Individually evaluated for impairment	2,127	2,167
Collectively evaluated for impairment	24,982	19,409
Subtotal	27,109	21,576
Consumer [Member] \| Home equity lines of credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	220	241
Total ending allowance balance	220	241	274	272
Collectively evaluated for impairment	12,748	12,963
Subtotal	12,748	12,963
Consumer [Member] \| Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	12	11
Total ending allowance balance	12	11	17	17
Collectively evaluated for impairment	971	970
Subtotal	$ 971	$ 970

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 8, 9

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (b)(1)(ii)

-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(d))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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

-Publisher OTS

-Name Federal Regulation (FR)

-Number Title 12

-Section 563c.102

-Paragraph 8

-Subparagraph a(ii)

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph d

-Article 9

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 114

-Paragraph 20

-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 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section L

-Subsection 1

+ Details

- 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+ Details