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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