Loans Receivable (Details 16) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Cowlitz Bank [Member]
Purchased Impaired Loans
Gross purchased impaired covered loans	$ 46,621		$ 65,606
Cowlitz Bank [Member] | Commercial business [Member]
Purchased Impaired Loans
Gross purchased impaired covered loans	38,628		51,689
Cowlitz Bank [Member] | Real estate construction and land development [Member]
Purchased Impaired Loans
Gross purchased impaired covered loans	1,664		6,122
Cowlitz Bank [Member] | Consumer [Member]
Purchased Impaired Loans
Gross purchased impaired covered loans	2,332		3,533
Cowlitz Bank [Member] | Commercial and industrial [Member] | Commercial business [Member]
Purchased Impaired Loans
Gross purchased impaired covered loans	14,267		21,624
Cowlitz Bank [Member] | Owner-occupied commercial real estate [Member] | Commercial business [Member]
Purchased Impaired Loans
Gross purchased impaired covered loans	12,668		17,157
Cowlitz Bank [Member] | Non-owner occupied commercial real estate [Member] | Commercial business [Member]
Purchased Impaired Loans
Gross purchased impaired covered loans	11,693		12,908
Cowlitz Bank [Member] | One-to-four family residential [Member]
Purchased Impaired Loans
Gross purchased impaired covered loans	3,997		4,262
Cowlitz Bank [Member] | One-to-four family residential [Member] | Real estate construction and land development [Member]
Purchased Impaired Loans
Gross purchased impaired covered loans	1,664		6,122
Cowlitz Bank [Member] | Five or more family residential and commercial properties [Member] | Real estate construction and land development [Member]
Purchased Impaired Loans
Gross purchased impaired covered loans	0		0
Pierce Commercial Bank [Member]
Purchased Impaired Loans
Gross purchased impaired non-covered loans	35,180		47,394
Pierce Commercial Bank [Member] | Commercial business [Member]
Purchased Impaired Loans
Gross purchased impaired non-covered loans	27,052		35,503
Pierce Commercial Bank [Member] | Real estate construction and land development [Member]
Purchased Impaired Loans
Gross purchased impaired non-covered loans	2,873		4,195
Pierce Commercial Bank [Member] | Consumer [Member]
Purchased Impaired Loans
Gross purchased impaired non-covered loans	1,174		4,393
Pierce Commercial Bank [Member] | Commercial and industrial [Member] | Commercial business [Member]
Purchased Impaired Loans
Gross purchased impaired non-covered loans	16,876		21,953
Pierce Commercial Bank [Member] | Owner-occupied commercial real estate [Member] | Commercial business [Member]
Purchased Impaired Loans
Gross purchased impaired non-covered loans	5,252		5,748
Pierce Commercial Bank [Member] | Non-owner occupied commercial real estate [Member] | Commercial business [Member]
Purchased Impaired Loans
Gross purchased impaired non-covered loans	4,924		7,802
Pierce Commercial Bank [Member] | One-to-four family residential [Member]
Purchased Impaired Loans
Gross purchased impaired non-covered loans	4,081		3,303
Pierce Commercial Bank [Member] | One-to-four family residential [Member] | Real estate construction and land development [Member]
Purchased Impaired Loans
Gross purchased impaired non-covered loans	2,403		3,375
Pierce Commercial Bank [Member] | Five or more family residential and commercial properties [Member] | Real estate construction and land development [Member]
Purchased Impaired Loans
Gross purchased impaired non-covered loans	470		820
NCB [Member]
Purchased Impaired Loans
Gross purchased impaired non-covered loans	6,184	[1]
NCB [Member] | Commercial business [Member]
Purchased Impaired Loans
Gross purchased impaired non-covered loans	5,492	[1]
NCB [Member] | Real estate construction and land development [Member]
Purchased Impaired Loans
Gross purchased impaired non-covered loans	609	[1]
NCB [Member] | Consumer [Member]
Purchased Impaired Loans
Gross purchased impaired non-covered loans	83	[1]
NCB [Member] | Commercial and industrial [Member] | Commercial business [Member]
Purchased Impaired Loans
Gross purchased impaired non-covered loans	1,594	[1]
NCB [Member] | Owner-occupied commercial real estate [Member] | Commercial business [Member]
Purchased Impaired Loans
Gross purchased impaired non-covered loans	1,862	[1]
NCB [Member] | Non-owner occupied commercial real estate [Member] | Commercial business [Member]
Purchased Impaired Loans
Gross purchased impaired non-covered loans	2,036	[1]
NCB [Member] | One-to-four family residential [Member]
Purchased Impaired Loans
Gross purchased impaired non-covered loans	0	[1]
NCB [Member] | Five or more family residential and commercial properties [Member] | Real estate construction and land development [Member]
Purchased Impaired Loans
Gross purchased impaired non-covered loans	609	[1]
Valley [Member]
Purchased Impaired Loans
Gross purchased impaired non-covered loans	3,642	[1]
Valley [Member] | Commercial business [Member]
Purchased Impaired Loans
Gross purchased impaired non-covered loans	1,395	[1]
Valley [Member] | Real estate construction and land development [Member]
Purchased Impaired Loans
Gross purchased impaired non-covered loans	432	[1]
Valley [Member] | Consumer [Member]
Purchased Impaired Loans
Gross purchased impaired non-covered loans	1,449	[1]
Valley [Member] | Commercial and industrial [Member] | Commercial business [Member]
Purchased Impaired Loans
Gross purchased impaired non-covered loans	883	[1]
Valley [Member] | Owner-occupied commercial real estate [Member] | Commercial business [Member]
Purchased Impaired Loans
Gross purchased impaired non-covered loans	512	[1]
Valley [Member] | Non-owner occupied commercial real estate [Member] | Commercial business [Member]
Purchased Impaired Loans
Gross purchased impaired non-covered loans	0	[1]
Valley [Member] | One-to-four family residential [Member]
Purchased Impaired Loans
Gross purchased impaired non-covered loans	366	[1]
Valley [Member] | Five or more family residential and commercial properties [Member] | Real estate construction and land development [Member]
Purchased Impaired Loans
Gross purchased impaired non-covered loans	$ 432	[1]

[1] The NCB Acquisition was completed on January 9, 2013 and the Valley Acquisition was completed on July 15, 2013.