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Share-Based Compensation Plans - Narrative (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) year shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Maximum exercisable period for stock options (years) | 10 years |  |  |
Aggregate number of shares of common stock available for grant (shares) | 1,719,901 |  |  |
Employee stock purchase plan expense | $ | $ 12,000 | $ 8,900 | $ 8,600 |
Nonvested awards, compensation cost not yet recognized | $ | 20,400 |  |  |
Cash received from exercise of options | $ | 100 |  |  |
Tax benefit from exercise of options | $ | $ 14 |  |  |
Restricted stock units, granted as long term incentive compensation (percent) | 40.00% |  |  |
Restricted stock units, vesting upon meeting certain thresholds (percent) | 60.00% |  |  |
Director | Common Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Voting common stock issued (shares) | 41,136 |  |  |
Voting common stock issued | $ | $ 500 |  |  |
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period (years) | 3 years |  |  |
Options expiration date (years) | 10 years |  |  |
Number of shares granted (shares) | 0 |  |  |
Restricted Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period (years) | 3 years |  |  |
Number of restricted stock units granted (shares) | 903,581 |  |  |
Restricted stock units vesting percentage per year | 33.33% |  |  |
Minimum | Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period (years) | 3 years |  |  |
Maximum | Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period (years) | 5 years |  |  |
2010 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Fully diluted tangible book value | 50.00% |  |  |
Maximum number of shares that may be issued under 2010 plan (shares) | 3,666,667 |  |  |
2019 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Maximum number of shares that may be issued under plan (shares) | 1,500,000 |  |  |
2004 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Maximum number of shares that may be issued under plan (shares) | 2,750,000 |  |  |
BRRP |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Participant vested in an annual deferral accounts |  | 100.00% |  |
Involuntary termination age (year) | year | 65 |  |  |
Restricted stock units outstanding (shares) | 110,571 |  |  |
BRRP | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Receipt deferral percentage under BRRP plan |  | 25.00% |  |
BRRP | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Receipt deferral percentage under BRRP plan |  | 50.00% |  |
ESPP |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Employee stock purchase plan expense | $ | $ 140 | $ 170 | $ 141 |
Purchase price under employee stock purchase plan (percent) | 85.00% |  |  | 85.00%
Purchase price under employee stock purchase plan, discount (percent) | 15.00% |  |  | 15.00%
2004 and 2019 Plan | Restricted Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of restricted stock units granted (shares) | 903,581 |  |  |
Cliff | 2004 and 2019 Plan | Restricted Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period (years) | 3 years |  |  |
Number of restricted stock units granted (shares) | 440,446 |  |  |
Waterfall | 2004 and 2019 Plan | Restricted Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period (years) | 3 years |  |  |

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