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Acquisitions - Additional Information (Detail) - USD ($)
 1 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 26, 2019
Jun. 30, 2019
Dec. 31, 2018
Business Acquisition [Line Items]        
Common stock, shares outstanding 45,061,372   45,061,372 38,375,407
Acquisition of goodwill $ 151,111,000   $ 151,111,000 $ 119,880,000
Decrease in value of acquired investment securities 387,000      
Decrease in value of total loans 2,900,000      
Decrease in value of premises and equipment 4,200,000      
Increase decrease in value of intangibles 5,400,000      
Decrease in value of other assets 4,000,000.0      
Decrease in value of total deposits 117,000      
Increase in value of subordinated debentures 816,000      
Core deposit intangible [Member]        
Business Acquisition [Line Items]        
Increase decrease in value of intangibles $ 1,300,000      
Salin Bank and Trust Company [Member]        
Business Acquisition [Line Items]        
Exchange ratio per share   23907.50%    
Cash paid for each share   $ 87,417.17    
Common stock, shares outstanding   275,000    
Common stock issued   6,563,697    
Market closing price per share   $ 15.65    
Estimated transaction value   $ 126,700,000    
Costs related to the acquisition   5,600,000    
Total purchase price   126,722,000    
Net intangible assets acquired   19,818,000    
Acquisition of goodwill   $ 31,232,000    
Core deposit intangible amortization period     10 years