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Regulatory Matters - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Mar. 17, 2017
Dec. 31, 2018
Oct. 23, 2018
Dec. 31, 2017
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]        
Capital conservation buffer, phase-in period   5 years    
Capital conservation buffer, percentage at the beginning stage   0.625%    
Capital conservation buffer, percentage fully phased in 2019   2.50%    
Minimum leverage capital ratio to be categorized as well capitalized   5.00%    
Minimum Tier 1 risk based capital ratio to be categorized as well capitalized   8.00%    
Minimum total risk based capital ratio to be categorized as well capitalized   10.00%    
Minimum Common equity Tier 1 risk-based capital ratio   6.50%    
Preferred stock par value   $ 0.01   $ 0.01
Treasury Stock, Value   $ 161,998   $ 7,615
Depositary Shares [Member] | Series A Noncumulative Preferred Stock [Member]        
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]        
Depositary shares issued 20,600,000      
Preferred stock par value $ 0.01      
Preferred stock, liquidation preference per share 1,000      
Depository shares, liquidation preference per share $ 25      
Fixed dividend rate per annum 6.375%      
Floating dividend rate per annum Three-month LIBOR plus 382.1 basis      
Dividends payable description Dividends will be payable in arrears on March 17, June 17, September 17, and December 17 of each year, which commenced on June 17, 2017.      
Common Stock [Member]        
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]        
Stock Repurchase Program, Authorized Amount     $ 300,000  
Treasury Stock, Value   $ 16,800    
Stock Repurchase Program, Number of Shares Authorized to be Repurchased   160,800,000