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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

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