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Components of Other Intangible Assets, by Reporting Unit (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]    
Finite lived intangibles, net $ 5,200  
Total other intangible assets, net 5,243 $ 6,421
Core deposit intangible assets    
Finite-Lived Intangible Assets [Line Items]    
Core deposit intangibles 12,282 12,282
Accumulated amortization (7,958) (7,148)
Finite lived intangibles, net 4,324 5,134
Other Intangible Assets    
Finite-Lived Intangible Assets [Line Items]    
Core deposit intangibles 4,246 4,246
Accumulated amortization (3,327) (2,959)
Finite lived intangibles, net 919 1,287
Community Banking    
Finite-Lived Intangible Assets [Line Items]    
Total other intangible assets, net 4,395 5,232
Community Banking | Core deposit intangible assets    
Finite-Lived Intangible Assets [Line Items]    
Core deposit intangibles 12,282 12,282
Accumulated amortization (7,958) (7,148)
Finite lived intangibles, net 4,324 5,134
Community Banking | Other Intangible Assets    
Finite-Lived Intangible Assets [Line Items]    
Core deposit intangibles 535 535
Accumulated amortization (464) (437)
Finite lived intangibles, net 71 98
Insurance Services    
Finite-Lived Intangible Assets [Line Items]    
Total other intangible assets, net 848 1,189
Insurance Services | Other Intangible Assets    
Finite-Lived Intangible Assets [Line Items]    
Core deposit intangibles 3,711 3,711
Accumulated amortization (2,863) (2,522)
Finite lived intangibles, net $ 848 $ 1,189