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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
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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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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