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Mergers and Acquisitions - Schedule of Fair Value of Acquired Identifiable Assets and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Apr. 21, 2017
Jun. 03, 2016
Sep. 30, 2017
Dec. 31, 2016
Business Acquisition [Line Items]        
Resulting goodwill     $ 1,487,607 $ 863,767
Cardinal Financial Corporation [Member]        
Business Acquisition [Line Items]        
Value of common shares issued $ 972,499      
Fair value of stock options assumed 2,741      
Cash for fractional shares 14      
Total purchase price 975,254      
Cash and cash equivalents 44,545      
Investment securities 395,829      
Loans held for sale 271,301      
Loans 3,168,599      
Premises and equipment 24,208      
Other assets 135,383      
Total identifiable assets 4,069,818      
Deposits 3,349,812      
Short-term borrowings 96,215      
Long-term borrowings 220,119      
Unfavorable lease liability 2,281      
Other liabilities 48,650      
Total identifiable liabilities 3,717,077      
Fair value of net assets acquired including identifiable intangible assets 352,741      
Resulting goodwill 622,513      
Cardinal Financial Corporation [Member] | Core Deposit Intangible Assets [Member]        
Business Acquisition [Line Items]        
Cash for fractional shares 14      
Core deposit intangibles 28,723      
Cardinal Financial Corporation [Member] | George Mason Trade Name Intangible [Member]        
Business Acquisition [Line Items]        
Core deposit intangibles $ 1,230      
Bank of Georgetown [Member]        
Business Acquisition [Line Items]        
Value of common shares issued   $ 253,799    
Fair value of stock options assumed   10,696    
Cash for fractional shares   10    
Total purchase price   264,505    
Cash and cash equivalents   29,340    
Investment securities   219,783    
Loans   966,870    
Premises and equipment   5,574    
Other assets   31,605    
Total identifiable assets   1,262,230    
Deposits   971,685    
Short-term borrowings   101,021    
Long-term borrowings   67,659    
Other liabilities   11,532    
Total identifiable liabilities   1,151,897    
Fair value of net assets acquired including identifiable intangible assets   110,333    
Resulting goodwill   154,172    
Bank of Georgetown [Member] | Core Deposit Intangible Assets [Member]        
Business Acquisition [Line Items]        
Cash for fractional shares   10    
Core deposit intangibles   $ 9,058