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Investment Securities: Schedule of Held to Maturity Securities (Details) (Fair value states and political subdivisions, USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
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Fair value states and political subdivisions |  |
Held to Maturity Securities Amortized Cost | $ 920 | $ 1,865
Held to Maturity Securities Gross Unrealized Gains | 173 | 236
Held to Maturity Securities Fair Value | $ 1,093 | $ 2,101
Held to Maturity Securities Tax Equivalent Yield | 7.37% | 4.39%

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