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Other Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Summary of carrying basis and accumulated amortization of recognized intangible assets    
Gross Carrying Amount $ 6,793 $ 6,492
Accumulated Amortization (5,244) (4,484)
Banking intangibles [Member]
    
Summary of carrying basis and accumulated amortization of recognized intangible assets    
Gross Carrying Amount 5,651 5,651
Accumulated Amortization (4,432) (3,802)
Banking intangibles [Member] | Core deposits intangible [Member]
    
Summary of carrying basis and accumulated amortization of recognized intangible assets    
Gross Carrying Amount 5,451 5,451
Accumulated Amortization (4,302) (3,680)
Banking intangibles [Member] | Customer relationship intangible [Member]
    
Summary of carrying basis and accumulated amortization of recognized intangible assets    
Gross Carrying Amount 200 200
Accumulated Amortization (130) (122)
Purchased software [Member]
    
Summary of carrying basis and accumulated amortization of recognized intangible assets    
Gross Carrying Amount 1,142 841
Accumulated Amortization (812) (682)
Purchased software [Member] | Banking [Member]
    
Summary of carrying basis and accumulated amortization of recognized intangible assets    
Gross Carrying Amount 978 679
Accumulated Amortization (700) (598)
Purchased software [Member] | Data processing [Member]
    
Summary of carrying basis and accumulated amortization of recognized intangible assets    
Gross Carrying Amount 164 162
Accumulated Amortization $ (112) $ (84)