Borrowings (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Federal Home Loan Bank loan agreement [Member] | FHLB of Seattle [Member]
Borrowings [Line Items]
Maximum borrowing capacity, percentage of assets (in hundredths)	35.00%
Maximum borrowing capacity under loan agreement	$ 128.3
Amount available to borrow	89.0	83.5
Outstanding borrowings	8.0	8.5
Federal Reserve Bank Borrower-in-Custody Program [Member]
Borrowings [Line Items]
Unused borrowing capacity	9.8	21.9
Letter of Credit [Member] | FHLB of Seattle [Member]
Borrowings [Line Items]
Letters of credit to secured deposits	30.0	24.0
Line of credit, amount available	51.0	51.0
Line of Credit [Member] | Pacific Coast Banker's Bank [Member]
Borrowings [Line Items]
Line of credit, amount available	$ 2.0