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Loans and Allowance for Loan Losses - Additional Information (Detail) - USD ($)
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Financing Receivable Recorded Investment [Line Items]      
Total loans $ 5,606,808,000   $ 4,975,976,000
Percentage of loans secured by real estate 59.00%    
Interest income that would have been recognized $ 1,400,000 $ 1,700,000  
Interest income recognized on impaired loans 0 $ 0  
Commercial and Industrial [Member] | Ancillary Services [Member]      
Financing Receivable Recorded Investment [Line Items]      
Total loans 83,000,000   $ 60,000,000
Pegasus Bank [Member]      
Financing Receivable Recorded Investment [Line Items]      
Total loans 392,144,000    
Pegasus Bank [Member] | Real Estate [Member]      
Financing Receivable Recorded Investment [Line Items]      
Total loans $ 209,000,000    
Percentage of loans secured by real estate 53.00%    
Pegasus Bank [Member] | Commercial and Industrial [Member]      
Financing Receivable Recorded Investment [Line Items]      
Total loans $ 160,000,000    
Pegasus Bank [Member] | Commercial and Industrial [Member] | Oil and Gas Industry [Member]      
Financing Receivable Recorded Investment [Line Items]      
Total loans $ 40,000,000