Allowance for Credit Losses - Troubled Debt Restructurings (Details) (USD $)	12 Months Ended
Dec. 31, 2012 Loans	Dec. 31, 2011 Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 16,655,000	$ 19,811,000
Reserves specific to modified loans	487,000	3,217,000
Additional commitments to lend	700,000
Number of Loans	2	8
Pre-Modification Outstanding Recorded Investment	500,000	18,638,000
Principal Modification	0	0
Post Modification Outstanding Recorded Investment	500,000	18,638,000
Outstanding Recorded Investment	487,000	17,479,000
Defaults on troubled debt restructurings	1
Number of TDR's with subsequent defaults		1
Recorded investment of TDR's with subsequent defaults	0
Increase in allowance related to TDR's with subsequent defaults	152,000	1,471,000
Commercial
Financing Receivable, Modifications [Line Items]
Number of Loans		2
Pre-Modification Outstanding Recorded Investment		3,089,000
Principal Modification		0
Post Modification Outstanding Recorded Investment		3,089,000
Outstanding Recorded Investment		2,791,000
Commercial \| Commercial and industrial
Financing Receivable, Modifications [Line Items]
Number of Loans		2
Pre-Modification Outstanding Recorded Investment		3,089,000
Principal Modification		0
Post Modification Outstanding Recorded Investment		3,089,000
Outstanding Recorded Investment		2,791,000
Real Estate Portfolio Segment
Financing Receivable, Modifications [Line Items]
Number of Loans		5
Pre-Modification Outstanding Recorded Investment		13,278,000
Principal Modification		0
Post Modification Outstanding Recorded Investment		13,278,000
Outstanding Recorded Investment		13,040,000
Real Estate Portfolio Segment \| Owner occupied
Financing Receivable, Modifications [Line Items]
Number of Loans	1	1
Pre-Modification Outstanding Recorded Investment	425,000	1,074,000
Principal Modification	0	0
Post Modification Outstanding Recorded Investment	425,000	1,074,000
Outstanding Recorded Investment	415,000	1,019,000
Real Estate Portfolio Segment \| Real estate construction and other land loans
Financing Receivable, Modifications [Line Items]
Number of Loans		3
Pre-Modification Outstanding Recorded Investment		11,094,000
Principal Modification		0
Post Modification Outstanding Recorded Investment		11,094,000
Outstanding Recorded Investment		10,911,000
Real Estate Portfolio Segment \| Commercial real estate
Financing Receivable, Modifications [Line Items]
Number of Loans		1
Pre-Modification Outstanding Recorded Investment		1,110,000
Principal Modification		0
Post Modification Outstanding Recorded Investment		1,110,000
Outstanding Recorded Investment		1,110,000
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans		1
Pre-Modification Outstanding Recorded Investment		2,271,000
Principal Modification		0
Post Modification Outstanding Recorded Investment		2,271,000
Outstanding Recorded Investment		1,648,000
Consumer Portfolio Segment [Member] \| Equity loans and lines of credit
Financing Receivable, Modifications [Line Items]
Number of Loans	1	1
Pre-Modification Outstanding Recorded Investment	75,000	2,271,000
Principal Modification	0	0
Post Modification Outstanding Recorded Investment	75,000	2,271,000
Outstanding Recorded Investment	$ 72,000	$ 1,648,000

Financing Receivable, Modifications, Amount of Principal Modifications Made During Period

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Financing Receivable, Modifications, Numer of Contracts Modified During Period

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Financing Receivable, Modifications, Outstanding Recorded Investment of Loans Modified During Period

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Financing Receivable, Modifications, Post-Modification Recorded Investment of Loans Modified During Period

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Financing Receivable, Modifications, Pre-Modification Recorded Investment of Loans Modified During Period

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Financing Receivable, Modifications, Related Allowance

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- Definition

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 40

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6951948&loc=d3e18845-111554

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Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 34

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953682-111524

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Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.

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- Definition

Reflects the unfunded portion of contractual agreements to lend funds to borrowers for loans whose terms have been modified by troubled debt restructuring.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 40

-Section 50

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-URI http://asc.fasb.org/extlink&oid=6951948&loc=d3e18794-111554

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-Name Statement of Financial Accounting Standard (FAS)

-Number 15

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-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.

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