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Business Combinations (Detail)
$ in Thousands
3 Months Ended
Mar. 11, 2020
shares
Apr. 01, 2019
USD ($)
Dec. 31, 2019
USD ($)
office
Mar. 31, 2020
USD ($)
Business Acquisition [Line Items]        
Assets under management at time of acquisition     $ 2,000,000 $ 822,400
Number of banking offices | office     18  
Tirschwell & Loewy        
Business Acquisition [Line Items]        
Goodwill recorded as result of acquisition   $ 8,200    
Contingent consideration liability   $ 6,600   9,400
Additional cash consideration to former stakeholders   3 years    
Contingent consideration limit     $ 11,000 $ 11,000
Total cost of acquisition   $ 21,600    
Cash consideration   15,000    
Increase in estimated fair value of contingent consideration liability     $ 2,800  
Tirschwell & Loewy | Customer Relationships        
Business Acquisition [Line Items]        
Identifiable intangible assets acquired   12,600    
Tirschwell & Loewy | Other Intangible Assets        
Business Acquisition [Line Items]        
Identifiable intangible assets acquired   $ 800    
SB One Bancorp        
Business Acquisition [Line Items]        
Common stock portion, number of SB One Bancorp stock for each share of company common stock converted | shares 1.357