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Business Combinations - Additional Information (Detail) - Salin Banc shares Inc [Member] - USD ($)
$ / shares in Units, $ in Millions
Oct. 29, 2018
Dec. 31, 2018
Oct. 26, 2018
Business Acquisition [Line Items]      
Total assets   $ 929.4  
Total deposits   749.5  
Total loans   $ 593.7  
Exchange ratio per share 23907.50%    
Cash paid for each share $ 84,417.17    
Market closing price per share     $ 16.95
Estimated transaction value     $ 135.3