Allowance for Credit Losses - Loan Portfolio by Impairment Methodology (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	$ 395,771	$ 428,159
Ending balance: individually evaluated for impairment	17,105	23,644
Ending balance: collectively evaluated for impairment	378,666	404,515
Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	104,555	108,047
Ending balance: individually evaluated for impairment	2,405	3,857
Ending balance: collectively evaluated for impairment	102,150	104,190
Real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	237,938	259,241
Ending balance: individually evaluated for impairment	12,868	17,359
Ending balance: collectively evaluated for impairment	225,070	241,882
Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	53,278	60,871
Ending balance: individually evaluated for impairment	1,832	2,428
Ending balance: collectively evaluated for impairment	$ 51,446	$ 58,443

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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

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- Definition

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

+ References

+ Details

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- Definition

Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.10(3))

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

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 10

-Subparagraph 3

-Article 9

+ Details

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