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Disclosures About Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Assets and liability measured at fair value on a recurring basis
Available for sale	$ 176,896	$ 182,923
U.S. Agency Securities [Member]
Assets and liability measured at fair value on a recurring basis
Available for sale	7,317	10,709
U.S. Agency mortgage-backed securities [Member]
Assets and liability measured at fair value on a recurring basis
Available for sale	163,635	172,214
Fair Value Measurements, Recurring Basis [Member]
Assets and liability measured at fair value on a recurring basis
Fair value of swap asset	266	346
Fair value of swap liability	266	346
Fair Value Measurements, Recurring Basis [Member] | U.S. Agency Securities [Member]
Assets and liability measured at fair value on a recurring basis
Available for sale	7,317	10,709
Fair Value Measurements, Recurring Basis [Member] | U.S. Agency mortgage-backed securities [Member]
Assets and liability measured at fair value on a recurring basis
Available for sale	163,635	172,214
Fair Value Measurements, Recurring Basis [Member] | Other Securities [Member]
Assets and liability measured at fair value on a recurring basis
Available for sale	5,944
Fair Value Measurements, Recurring Basis [Member] | Level 1 [Member]
Assets and liability measured at fair value on a recurring basis
Fair value of swap asset
Fair value of swap liability
Fair Value Measurements, Recurring Basis [Member] | Level 1 [Member] | U.S. Agency Securities [Member]
Assets and liability measured at fair value on a recurring basis
Available for sale
Fair Value Measurements, Recurring Basis [Member] | Level 1 [Member] | U.S. Agency mortgage-backed securities [Member]
Assets and liability measured at fair value on a recurring basis
Available for sale
Fair Value Measurements, Recurring Basis [Member] | Level 1 [Member] | Other Securities [Member]
Assets and liability measured at fair value on a recurring basis
Available for sale
Fair Value Measurements, Recurring Basis [Member] | Level 2 [Member]
Assets and liability measured at fair value on a recurring basis
Fair value of swap asset	266	346
Fair value of swap liability	266	346
Fair Value Measurements, Recurring Basis [Member] | Level 2 [Member] | U.S. Agency Securities [Member]
Assets and liability measured at fair value on a recurring basis
Available for sale	7,317	10,709
Fair Value Measurements, Recurring Basis [Member] | Level 2 [Member] | U.S. Agency mortgage-backed securities [Member]
Assets and liability measured at fair value on a recurring basis
Available for sale	163,635	172,214
Fair Value Measurements, Recurring Basis [Member] | Level 2 [Member] | Other Securities [Member]
Assets and liability measured at fair value on a recurring basis
Available for sale	5,944
Fair Value Measurements, Recurring Basis [Member] | Level 3 [Member]
Assets and liability measured at fair value on a recurring basis
Fair value of swap asset
Fair value of swap liability
Fair Value Measurements, Recurring Basis [Member] | Level 3 [Member] | U.S. Agency Securities [Member]
Assets and liability measured at fair value on a recurring basis
Available for sale
Fair Value Measurements, Recurring Basis [Member] | Level 3 [Member] | U.S. Agency mortgage-backed securities [Member]
Assets and liability measured at fair value on a recurring basis
Available for sale
Fair Value Measurements, Recurring Basis [Member] | Level 3 [Member] | Other Securities [Member]
Assets and liability measured at fair value on a recurring basis
Available for sale

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