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Investments (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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Investments [Abstract] |  |
Number of securities with unrealized losses | 164 | 197
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities available-for-sale | $ 467,688 | $ 425,044
States and political subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities available-for-sale | 98,600 |
Arizona State Water Infrastructure Finance Authority [Member] | States and political subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities available-for-sale | $ 4,500 |

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