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Goodwill and Other Amortizing Intangible Assets - Summarized Other Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]    
Gross Intangible Assets $ 20,126 $ 23,454
Accumulated Amortization (18,895) (21,789)
Net Intangible Assets 1,231 1,665
Customer Deposit Intangibles [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Intangible Assets 19,142 22,470
Accumulated Amortization (18,619) (21,773)
Net Intangible Assets 523 697
Customer list intangible    
Finite-Lived Intangible Assets [Line Items]    
Gross Intangible Assets 984 984
Accumulated Amortization (276) (16)
Net Intangible Assets $ 708 $ 968