Business Combinations (Narrative) (Details) (USD $)	3 Months Ended								12 Months Ended				12 Months Ended		12 Months Ended			0 Months Ended	12 Months Ended	0 Months Ended	12 Months Ended	0 Months Ended	12 Months Ended
	Dec. 31, 2012 item	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012 item	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Circle Bancorp [Member] item	Dec. 31, 2012 Circle Bancorp [Member]	Nov. 14, 2012 Circle Bancorp [Member]	Dec. 31, 2012 Evergreen Bank And Rainier Pacific Bank [Member]	Dec. 31, 2011 Evergreen Bank And Rainier Pacific Bank [Member]	Dec. 31, 2010 Evergreen Bank And Rainier Pacific Bank [Member]	Jan. 22, 2010 Evergreen Bank [Member]	Dec. 31, 2012 Evergreen Bank [Member] store	Feb. 26, 2010 Rainier Pacific Bank [Member]	Dec. 31, 2012 Rainier Pacific Bank [Member] store	Jun. 18, 2010 Nevada Security Bank [Member]	Dec. 31, 2012 Nevada Security Bank [Member] store	Dec. 31, 2011 Nevada Security Bank [Member]	Dec. 31, 2010 Nevada Security Bank [Member]	Dec. 31, 2012 Loss Sharing Agreement Range, Lower Range [Member] Evergreen Bank [Member]	Dec. 31, 2012 Loss Sharing Agreement Range, Lower Range [Member] Rainier Pacific Bank [Member]	Dec. 31, 2012 Loss Sharing Agreement Range, Upper Range [Member] Evergreen Bank [Member]	Dec. 31, 2012 Loss Sharing Agreement Range, Upper Range [Member] Rainier Pacific Bank [Member]	Dec. 31, 2012 Non-Single Family Residential [Member] Evergreen Bank [Member]	Dec. 31, 2012 Non-Single Family Residential [Member] Rainier Pacific Bank [Member]	Dec. 31, 2012 Non-Single Family Residential [Member] Nevada Security Bank [Member]	Dec. 31, 2012 Single Family Residential [Member] Evergreen Bank [Member]	Dec. 31, 2012 Single Family Residential [Member] Rainier Pacific Bank [Member]	Dec. 31, 2012 Single Family Residential [Member] Nevada Security Bank [Member]
Business Acquisition [Line Items]
Aggregate cash paid to aquire entity														$ 24,860,000						$ (59,351,000)		$ 29,950,000
Number of locations in operation	194								194			6							6		14		5
Bargain purchase gain (goodwill)											(6,437,000)						6,400,000	(6,437,000)		35,808,000		10,393,000
Revenues													2,300,000		31,200,000	46,200,000	54,000,000						21,800,000	18,600,000	15,100,000
Non-interest expense	98,046,000	86,974,000	86,936,000	87,696,000	85,339,000	86,224,000	83,207,000	84,201,000	359,652,000	338,971,000	317,738,000		2,800,000		21,400,000	25,300,000	23,600,000						8,700,000	11,300,000	7,300,000
Net income (loss)	27,958,000	25,153,000	23,277,000	25,503,000	21,382,000	21,862,000	17,785,000	13,467,000	101,891,000	74,496,000	28,326,000		306,000		9,500,000	13,800,000	11,000,000						6,000,000	2,100,000	1,300,000
Merger related expenses									2,338,000	360,000	6,675,000		1,900,000			92,000	4,400,000							101,000	1,700,000
Accrued acquisition-related restructuring charges													631,000,000
FDIC indemnification asset, loss absorption percentage																							80.00%			80.00%	80.00%	95.00%	95.00%
FDIC indemnification asset, recovery percentage																							80.00%			80.00%	80.00%	95.00%	95.00%
FDIC indemnification asset, range boundary																			90,000,000		95,000,000
FDIC indemnification asset, losses to be incurred before loss sharing agreement is triggered																			30,200,000
FDIC indemnification asset, period in-force, after acquisition date, loss sharing provisions																														5 years	5 years	5 years	10 years	10 years	10 years
FDIC indemnification asset, period in-force, after acquisition date, loss recovery provisions																														8 years	8 years	8 years	10 years	10 years	10 years
Cost basis net assets (liabilities)														17,127,000				58,811,000		(50,295,000)		53,629,000
Goodwill deductible for income tax purposes																					27,600,000		36,800,000
Core deposit intangible assets																					1,100,000		322,000
Purchase of real estate and furniture and equipment														$ 7,713,000					$ 344,000	$ 17,000	$ 26,300,000	$ 50,000	$ 2,000,000