Loans (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Debt Instrument [Line Items]
Commercial loans	$ 170,325,000		$ 170,325,000		$ 153,043,000
Percent of participation agreement interest	80.00%		80.00%
Ownership interest in each loan is participates			20.00%
Cash payments of interest	54,000	120,000	169,000	289,000
Aggregate purchase price of loans, maximum			45,000,000
Percent of loans risk rated for capital adequacy			100.00%
Allocated specific reserves to modified TDRs	1,500,000		1,500,000		830,000
Total TDR's	6,600,000		6,600,000		7,000,000
Recorded investment	4,026,000	9,235,000	4,026,000	9,235,000
Principal repayment at the date of modification	50,000		50,000
Stated interest rate, minimum			3.50%
Stated interest rate, maximum			6.50%
Stated interest rate, prior to change maximum	6.00%
Stated interest rate, prior to change minimum	5.50%
Interest payment impact on income statement			5,000
Stated interest rate, after change	5.00%
TDR's term	5 years
TDR's amortizing term	15 years
TDR's associated reserves	76,000		143,000
Number of days of default payment			90 days
Accruing TDR's	3,933,000		3,933,000		3,684,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Stated interest rate, minimum	4.75%
Stated interest rate, maximum	6.75%
Commercial Lines Of Credit [Member]
Debt Instrument [Line Items]
Commercial loans	13,334,000		13,334,000		11,782,000
Home Equity Line of Credit, Other [Member]
Debt Instrument [Line Items]
Commercial loans	12,056,000		12,056,000		10,447,000
Single-family residential [Member]
Debt Instrument [Line Items]
Mortgage loans	$ 11,462,000		$ 11,462,000		$ 25,373,000
Stated interest rate, minimum			5.00%
Stated interest rate, maximum			10.00%
Previous maturity date of Receivables			2034
Maturity date of Receivables			2042
Reduction in stated interest rate of loan			30 years