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Goodwill and Other Intangible Assets - Narrative (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2018
Mar. 23, 2018
Jan. 12, 2018
Dec. 31, 2017
Jul. 31, 2017
Goodwill              
Goodwill acquired during the year (preliminary allocation) and adjustments     $ 32,001        
Non-compete agreement         $ 156    
Title plant assets $ 6,800   $ 6,800     $ 6,700  
Gibraltar Private Bank & Trust Company              
Goodwill              
Goodwill acquired during the year (preliminary allocation) and adjustments $ 2,900            
Core deposit intangible assets       $ 18,529      
Sabadell United              
Goodwill              
Goodwill acquired during the year (preliminary allocation) and adjustments   $ 21,000          
Core deposit intangible assets             $ 66,600