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Share-Based Compensation - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Stock Based Compensation [Line Items]      
Share-based compensation, performance awards, performance goals description The performance shares that are awarded become earned and vested based on the achievement of certain performance goals during a performance period as established by the Committee at the time of each grant. The performance goals under the presently-awarded grant agreements are based on a comparison of the Company’s average performance over the performance period for the return on common equity, compounded annual growth rate of total assets, and return on average assets, all as relative to the average performance for publicly traded banks with total assets between $1 billion and $5 billion on the SNL Bank Index. Holders of performance share awards receive pass-through dividends but do not have any voting rights before the performance shares are earned and vested.    
Total assets $ 5,246,829,000 $ 4,246,688,000  
Tax benefit associated with compensation expense 45,000 53,000 $ 114,000
Total compensation cost 215,000 251,000 325,000
Total compensation cost 920,000 626,000 460,000
Cash received from option exercise 236,000 493,000 1,600,000
Actual tax benefit realized for the tax deductions 104,000 $ 213,000 $ 522,000
Unrecognized compensation cost $ 1,500,000    
Weighted-average period cost over which cost is expected to be recognized 1 year 1 month 6 days    
Option Activity Under the 2013 Plan [Member]      
Stock Based Compensation [Line Items]      
Maximum common shares issued under the plan 1,556,325    
Number of shares available incentive stock options 225,000    
Non-option awards granted 900,000    
Weighted average grant-date fair value of options granted $ 4.44 $ 5.54 $ 4.83
Option Activity Under the 2003 Plan [Member]      
Stock Based Compensation [Line Items]      
Maximum common shares issued under the plan 759,375    
Number of shares available incentive stock options 759,375    
Non-option awards granted 379,687    
Additional common shares available for issuance 885,937    
Performance Based Share Awards [Member] | Minimum [Member]      
Stock Based Compensation [Line Items]      
Total assets $ 1,000,000,000    
Performance Based Share Awards [Member] | Maximum [Member]      
Stock Based Compensation [Line Items]      
Total assets 5,000,000,000    
Restricted and Performance Shares [Member]      
Stock Based Compensation [Line Items]      
Tax benefit associated with compensation expense 148,000 $ 79,000 $ 47,000
Total compensation cost 215,000 251,000  
Total compensation cost $ 705,000 $ 376,000 $ 135,000