v2.4.0.6

Securities (Carrying Value of Securities Pledged as Collateral) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
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Schedule of Available-for-sale Securities [Line Items] |  |
Carrying amount of securities pledged as collateral | $ 420,243 | $ 458,532
To Washington and Oregon State To Secure Public Deposits [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying amount of securities pledged as collateral | 225,345 | 153,328
To Federal Home Loan Bank To Secure Advances [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying amount of securities pledged as collateral | 91,097 | 110,780
To Federal Reserve Bank To Secure Borrowings [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying amount of securities pledged as collateral | 56,347 | 149,315
Other Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying amount of securities pledged as collateral | $ 47,454 | $ 45,109

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- Definition The fair value of available-for-sale securities that serve as collateral for borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph i -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5086-111524 + Details
Name: | us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration