Subsequent Event Subsequent Event (Details) (USD $)	Jun. 30, 2013	Dec. 31, 2012	Jul. 31, 2013 North Cascades Bancshares [Member]
Percentage of Outstanding Common Stock Acquired			100.00%
Total purchase price			$ 30,581,000
Number of Shares Issued for Aquisition			687,876
Cash consideration for outstanding shares			13,838,000
Total assets	$ 7,996,816,000	$ 7,747,440,000	$ 326,703,000