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Components of Other Intangible Assets, by Reporting Unit (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Finite-Lived Intangible Liabilities [Line Items]    
Finite lived intangibles, net $ 2,704  
Total other intangible assets, net 2,866 3,522
Core deposit intangible assets
    
Finite-Lived Intangible Liabilities [Line Items]    
Finite lived intangibles, gross 7,940 7,940
Accumulated amortization (6,669) (6,244)
Finite lived intangibles, net 1,271 1,696
Other Intangible Assets
    
Finite-Lived Intangible Liabilities [Line Items]    
Finite lived intangibles, gross 4,246 4,173
Accumulated amortization (2,651) (2,347)
Finite lived intangibles, net 1,595 1,826
Community Banking
    
Finite-Lived Intangible Liabilities [Line Items]    
Total other intangible assets, net 1,396 1,848
Community Banking | Core deposit intangible assets
    
Finite-Lived Intangible Liabilities [Line Items]    
Finite lived intangibles, gross 7,940 7,940
Accumulated amortization (6,669) (6,244)
Finite lived intangibles, net 1,271 1,696
Community Banking | Other Intangible Assets
    
Finite-Lived Intangible Liabilities [Line Items]    
Finite lived intangibles, gross 535 535
Accumulated amortization (410) (383)
Finite lived intangibles, net 125 152
Insurance Services
    
Finite-Lived Intangible Liabilities [Line Items]    
Total other intangible assets, net 1,470 1,674
Insurance Services | Other Intangible Assets
    
Finite-Lived Intangible Liabilities [Line Items]    
Finite lived intangibles, gross 3,711 3,638
Accumulated amortization (2,241) (1,964)
Finite lived intangibles, net $ 1,470 $ 1,674