Annual report pursuant to Section 13 and 15(d)

Share-based Compensation - Additional Information (Detail)

v3.22.0.1
Share-based Compensation - Additional Information (Detail)
12 Months Ended
Dec. 31, 2021
USD ($)
Plan
Bank
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of incentive plans | Plan 1    
Unrecognized compensation expense   $ 1,800,000  
Weighted average period cost expected to be recognized   1 year 7 months 6 days  
Stock options, expiration term from date of grant 10 years    
Share-based compensation expense $ 2,436,000 $ 2,544,000 $ 3,125,000
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Period of continuous service 3 years    
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Period of continuous service 5 years    
2013 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares of common stock to be granted under equity incentive awards | shares 1,500,000    
Shares available for issuance under the Plan | shares 1,420,485    
2013 and 2021 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation expense $ 0    
Options granted in period (shares) | shares 0    
Stock options, expiration term from date of grant 10 years    
2013 and 2021 Plan | Restricted stock awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation expense $ 1,800,000    
Weighted average period cost expected to be recognized 1 year 7 months 6 days    
Total fair value of vested shares $ 2,700,000 $ 1,400,000 $ 2,100,000
Number of shares granted | shares 75,679 125,896 181,204
Grant date fair value, vested | $ / shares $ 16.01 $ 24.68 $ 27.56
2013 and 2021 Plan | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Period of continuous service 3 years    
2013 and 2021 Plan | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Period of continuous service 5 years    
2013 Equity Compensation Plan | Performance Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options, expiration term from date of grant 3 years    
Total fair value of vested shares $ 1,000,000.0    
Number of shares granted | shares 42,626    
Total fair value of granted shares $ 392,000    
Share-based compensation arrangement by share-based payment award, vesting rights Each PSU that vests entitles the recipient to receive one share of the Company’s common stock on a specified issuance date    
Grant date fair value, vested | $ / shares $ 18.40    
Number of regional banks | Bank 47    
Share-based compensation expense $ 77,000