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Investments (Narrative) (Details) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2016 USD ($) | Dec. 31, 2015 USD ($)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Total | 90 | 175
Available-for-sale Securities | $ 528,539,000 | $ 507,582,000
Available-for-sale Securities, Amortized Cost Basis, Total | 519,744,000 | 503,152,000
Low Income Housing Tax Credit Fund Investments [Member] |  |
Equity Method Investments | 7,400,000 |
Equity Method Investments Tax Credit Amount | 343,000 |
Equity Method Investments Operating Income Loss | 519,000 |
Equity Method Investment Additional Capital | 2,400,000 |
Thurston School District [Member] |  |
Available-for-sale Securities | 934,000 |
US States and Political Subdivisions Debt Securities [Member] |  |
Available-for-sale Securities | 107,926,000 | 102,183,000
Available-for-sale Securities, Amortized Cost Basis, Total | 103,433,000 | $ 99,093,000
US States and Political Subdivisions Debt Securities [Member] | Low Income Housing Tax Credit Fund Investments [Member] |  |
Equity Method Investments | $ 3,000,000 |

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
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