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Intangible Assets - Summary of Goodwill by Business Segment (Detail)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
USD ($)
Goodwill [Line Items]  
Balance at beginning of period $ 54,042
Acquisitions 25,691
Balance at end of period 79,733
Metropolitan Banks [Member]  
Goodwill [Line Items]  
Balance at beginning of period 8,078
Acquisitions 5,689
Balance at end of period 13,767
Community Banks [Member]  
Goodwill [Line Items]  
Balance at beginning of period 40,050
Acquisitions 20,002
Balance at end of period 60,052
Other Financial Services [Member]  
Goodwill [Line Items]  
Balance at beginning of period 5,464
Balance at end of period 5,464
Executive, Operations & Support [Member]  
Goodwill [Line Items]  
Balance at beginning of period 450
Balance at end of period $ 450