Borrowings (Narrative) (Details) (USD $)	0 Months Ended	12 Months Ended
	Jul. 01, 2008	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Debt Instrument [Line Items]
Purchase of main office facility	$ 12,900,000
Date of purchase	Jul. 01, 2008
Note secured by building	5,100,000	4,500,000
Maturity date		Apr. 01, 2014
Interest rate		5.95%
Interest paid		2,510,000	3,792,000	5,579,000
Securities sold under agreements to repurchase			16,348,000
Percentaged paid on securities sold under agreements to repurchase		0.25%	0.49%
Average balance outstanding		16,500,000	13,800,000
Maximum amount outstanding at any month end		22,600,000	17,200,000
FHLB Of Seattle [Member]
Debt Instrument [Line Items]
Ratio of line of credit to eligible assets		11.00%
Line of credit		132,000,000
Note Agreement With Federal Reserve Bank [Member]
Debt Instrument [Line Items]
Loans held by Federal Reserve Bank as collateral		81,000,000
Interest paid		1,000	1,000
Discount Window [Member]
Debt Instrument [Line Items]
Loans held by Federal Reserve Bank as collateral		$ 54,000,000