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Goodwill and Other Amortizing Intangible Assets - Summarized Other Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Gross Intangible Assets $ 22,511 $ 21,754
Accumulated Amortization (9,946) (6,822)
Net Intangible Assets 12,565 14,932
Customer deposit intangibles    
Finite-Lived Intangible Assets [Line Items]    
Gross Intangible Assets 20,228 19,471
Accumulated Amortization (8,877) (6,071)
Net Intangible Assets 11,351 13,400
Customer list intangible    
Finite-Lived Intangible Assets [Line Items]    
Gross Intangible Assets 2,283 2,283
Accumulated Amortization (1,069) (751)
Net Intangible Assets $ 1,214 $ 1,532