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Investments (Summary of Amortized Cost and Fair Values of General Obligation and Revenue Bonds) (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
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Amortized Cost And Estimated Fair Value Of Investment Securities Available For Sale By Type Of Bonds [Line Items] |  |
Amortized Cost | $ 519,744 | $ 503,152
Securities available for sale | 528,539 | 507,582
States and Political Subdivisions [Member] |  |
Amortized Cost And Estimated Fair Value Of Investment Securities Available For Sale By Type Of Bonds [Line Items] |  |
Amortized Cost | 103,433 | 99,093
Securities available for sale | 107,926 | 102,183
Port Airport And Marina [Member] |  |
Amortized Cost And Estimated Fair Value Of Investment Securities Available For Sale By Type Of Bonds [Line Items] |  |
Amortized Cost | 1,302 | 0
Securities available for sale | 1,374 | 0
California [Member] | States and Political Subdivisions [Member] |  |
Amortized Cost And Estimated Fair Value Of Investment Securities Available For Sale By Type Of Bonds [Line Items] |  |
Amortized Cost | 23,250 | 20,473
Securities available for sale | 24,690 | 21,642
Texas [Member] | States and Political Subdivisions [Member] |  |
Amortized Cost And Estimated Fair Value Of Investment Securities Available For Sale By Type Of Bonds [Line Items] |  |
Amortized Cost | 17,656 | 16,575
Securities available for sale | 18,326 | 16,954
Illinois [Member] | States and Political Subdivisions [Member] |  |
Amortized Cost And Estimated Fair Value Of Investment Securities Available For Sale By Type Of Bonds [Line Items] |  |
Amortized Cost | 10,234 | 9,997
Securities available for sale | 10,545 | 10,191
Ohio [Member] | States and Political Subdivisions [Member] |  |
Amortized Cost And Estimated Fair Value Of Investment Securities Available For Sale By Type Of Bonds [Line Items] |  |
Amortized Cost | 9,059 | 7,610
Securities available for sale | 9,305 | 7,748
Washington [Member] | States and Political Subdivisions [Member] |  |
Amortized Cost And Estimated Fair Value Of Investment Securities Available For Sale By Type Of Bonds [Line Items] |  |
Amortized Cost | 5,873 | 5,905
Securities available for sale | 6,090 | 6,081
Arizona [Member] | States and Political Subdivisions [Member] |  |
Amortized Cost And Estimated Fair Value Of Investment Securities Available For Sale By Type Of Bonds [Line Items] |  |
Amortized Cost | 2,023 | 2,039
Securities available for sale | 2,103 | 2,108
Utah [Member] | States and Political Subdivisions [Member] |  |
Amortized Cost And Estimated Fair Value Of Investment Securities Available For Sale By Type Of Bonds [Line Items] |  |
Amortized Cost | 951 | 953
Securities available for sale | 1,013 | 990
Other states [Member] | States and Political Subdivisions [Member] |  |
Amortized Cost And Estimated Fair Value Of Investment Securities Available For Sale By Type Of Bonds [Line Items] |  |
Amortized Cost | 18,518 | 20,334
Securities available for sale | 19,298 | 20,848
General Obligation Bonds [Member] | States and Political Subdivisions [Member] |  |
Amortized Cost And Estimated Fair Value Of Investment Securities Available For Sale By Type Of Bonds [Line Items] |  |
Amortized Cost | 87,564 | 83,886
Securities available for sale | 91,370 | 86,562
Revenue Bonds [Member] |  |
Amortized Cost And Estimated Fair Value Of Investment Securities Available For Sale By Type Of Bonds [Line Items] |  |
Amortized Cost | 15,869 | 15,207
Securities available for sale | 16,556 | 15,621
Revenue Bonds [Member] | States and Political Subdivisions [Member] |  |
Amortized Cost And Estimated Fair Value Of Investment Securities Available For Sale By Type Of Bonds [Line Items] |  |
Amortized Cost | 15,869 | 15,207
Securities available for sale | 16,556 | 15,621
Revenue Bonds [Member] | Water [Member] |  |
Amortized Cost And Estimated Fair Value Of Investment Securities Available For Sale By Type Of Bonds [Line Items] |  |
Amortized Cost | 4,402 | 3,942
Securities available for sale | 4,516 | 4,052
Revenue Bonds [Member] | College & University [Member] |  |
Amortized Cost And Estimated Fair Value Of Investment Securities Available For Sale By Type Of Bonds [Line Items] |  |
Amortized Cost | 2,706 | 2,975
Securities available for sale | 2,876 | 3,103
Revenue Bonds [Member] | Sales Tax [Member] |  |
Amortized Cost And Estimated Fair Value Of Investment Securities Available For Sale By Type Of Bonds [Line Items] |  |
Amortized Cost | 2,256 | 2,630
Securities available for sale | 2,373 | 2,663
Revenue Bonds [Member] | Lease [Member] |  |
Amortized Cost And Estimated Fair Value Of Investment Securities Available For Sale By Type Of Bonds [Line Items] |  |
Amortized Cost | 2,299 | 2,040
Securities available for sale | 2,403 | 2,100
Revenue Bonds [Member] | Electric & Power [Member] |  |
Amortized Cost And Estimated Fair Value Of Investment Securities Available For Sale By Type Of Bonds [Line Items] |  |
Amortized Cost | 729 | 679
Securities available for sale | 753 | 691
Revenue Bonds [Member] | Other sources [Member] |  |
Amortized Cost And Estimated Fair Value Of Investment Securities Available For Sale By Type Of Bonds [Line Items] |  |
Amortized Cost | 2,175 | 2,941
Securities available for sale | 2,261 | 3,012
Revenue Bonds [Member] | California [Member] |  |
Amortized Cost And Estimated Fair Value Of Investment Securities Available For Sale By Type Of Bonds [Line Items] |  |
Amortized Cost | 1,002 | 1,002
Securities available for sale | 1,030 | 1,028
Revenue Bonds [Member] | Texas [Member] |  |
Amortized Cost And Estimated Fair Value Of Investment Securities Available For Sale By Type Of Bonds [Line Items] |  |
Amortized Cost | 4,969 | 3,732
Securities available for sale | 5,153 | 3,863
Revenue Bonds [Member] | Ohio [Member] |  |
Amortized Cost And Estimated Fair Value Of Investment Securities Available For Sale By Type Of Bonds [Line Items] |  |
Amortized Cost | 318 | 318
Securities available for sale | 319 | 319
Revenue Bonds [Member] | Washington [Member] |  |
Amortized Cost And Estimated Fair Value Of Investment Securities Available For Sale By Type Of Bonds [Line Items] |  |
Amortized Cost | 1,306 | 1,791
Securities available for sale | 1,387 | 1,827
Revenue Bonds [Member] | Utah [Member] |  |
Amortized Cost And Estimated Fair Value Of Investment Securities Available For Sale By Type Of Bonds [Line Items] |  |
Amortized Cost | 4,426 | 4,434
Securities available for sale | 4,631 | 4,519
Revenue Bonds [Member] | Other states [Member] | States and Political Subdivisions [Member] |  |
Amortized Cost And Estimated Fair Value Of Investment Securities Available For Sale By Type Of Bonds [Line Items] |  |
Amortized Cost | 3,848 | 3,930
Securities available for sale | $ 4,036 | $ 4,065

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