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Goodwill and Other Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Intangible assets, Gross carrying amount $ 8,191 $ 8,011
Intangible assets, Accumulated amortization (5,550) (5,405)
Intangible assets, Valuation allowance (212) (212)
Intangible assets, Net carrying amount 2,429 2,394
Core Deposits [Member]
    
Intangible assets, Gross carrying amount 4,973 4,973
Intangible assets, Accumulated amortization (4,334) (4,258)
Intangible assets, Valuation allowance 0 0
Intangible assets, Net carrying amount 639 715
Mortgage Servicing Rights [Member]
    
Intangible assets, Gross carrying amount 3,218 3,038
Intangible assets, Accumulated amortization (1,216) (1,147)
Intangible assets, Valuation allowance (212) (212)
Intangible assets, Net carrying amount $ 1,790 $ 1,679