Loans - Additional Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Debt Instrument [Line Items]
Commercial loans	$ 166,799		$ 153,043
Single-family residential	46,618		43,058
Percent of participation agreement interest	75.00%
Cash payments of interest	57	88
Aggregate purchase price of loans, maximum	45,000
Allocated specific reserves to modified TDRs	842		830
Total recorded investment of loans modified as TDR	6,635	2,815
Number of days of default payment	90 days
Investments	172,481		158,280
Accruing TDR's	3,588		3,684
Commercial Lines Of Credit [Member]
Debt Instrument [Line Items]
Commercial loans	13,880		11,782
Home Equity Line of Credit, Other [Member]
Debt Instrument [Line Items]
Commercial loans	10,340		10,447
Single-family residential [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum		5.00%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum		10.00%
Investments	$ 46,618		$ 43,058

Allocated specific reserves to modified TDRs.

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- Definition

Loans and Leases Receivable Net of Deferred Income Single Family

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- Definition

Loans Aquired Maximum Aggregate Value

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- Definition

Loans Participation Agreement Percentage

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- Definition

Number of days of default payment.

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- Definition

Trouble debt restructuring accrual financial receivables.

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- Definition

When presenting a range of interest rates, the highest stated (contractual) rate for funds borrowed under the debt agreement as of the balance sheet date.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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-Subparagraph (SX 210.5-02.22(a)(1))

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- Definition

When presenting a range of interest rates, the lowest stated (contractual) rate for funds borrowed under the debt agreement as of the balance sheet date.

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- Definition

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

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-Name Accounting Standards Codification

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-SubTopic 40

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- Definition

Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

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- Definition

Amount after allowance and 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.

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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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- Definition

Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

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