Borrowings (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Pacific Coast Banker's Bank [Member]
Short-term Debt [Line Items]
Amount available to borrow under loan agreement	$ 2.0
Outstanding borrowings	0	0
Term period	2 years
Maturity date	Jun. 30, 2014
Federal Reserve Bank advances [Member]
Short-term Debt [Line Items]
Outstanding borrowings	0	0
Unused borrowing capacity	10.2	11.8
Line of Credit [Member] | FHLB of Seattle [Member]
Short-term Debt [Line Items]
Maximum borrowing capacity, percentage of assets (in hundredths)	35.00%
Maximum borrowing capacity under loan agreement	136.7
Amount available to borrow under loan agreement	105.6	90.7
Outstanding borrowings	25.7	21.9
Letters of credit to secured deposits	24.5	31.5
Line of credit, amount available	$ 47.7	$ 37.3