XML 114 R97.htm IDEA: XBRL DOCUMENT v3.20.4
Benefit Plans - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2006
Dec. 31, 2002
Dec. 31, 2020
USD ($)
retirement_payment
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
Defined Benefit Plan Disclosure [Line Items]          
Defined benefit plan age attained for coverage     21 years    
Service period for employees of coverage age, years     1 year    
Vesting percentage of participants in pension plan     100.00%    
Expected future employer contributions next year     $ 0    
Requisite service period for deferred compensation arrangement 10 years 10 years 10 years    
Discount rate     2.30%    
Decrease (increase) in other comprehensive income from retirement plans     $ 6,334 $ 730 $ 3,000
Retirement plan for the board of directors to get maximum payments minimum age     72 years    
Number of quarterly payments made to Board of Directors from Retirement Plan | retirement_payment     40    
Benefit plans compensation expense     $ 1,250    
Period in which undistributed balance of accrued benefit will be distributed     60 days    
Shares purchased under ESOP | shares     4,769,464    
Average price per share purchased under ESOP (in dollars per share) | $ / shares     $ 17.09    
Outstanding loan principal     $ 25,600,000    
Number of shares released under ESOP | shares     273,307 280,522  
Unallocated ESOP shares held in suspense | shares     1,183,180    
Fair market value of ESOP shares     $ 21,300,000    
ESOP compensation expenses     2,400,000 $ 4,500,000 4,500,000
Estimated expense under the supplemental ESOP provision     $ 180,000 140,000 121,000
Number of shares authorized for issuance under stock award plan | shares     1,350,000    
Unrecognized compensation cost relating go unvested restricted stock     $ 6,400,000    
Weighted average period in which unrecognized compensation cost recognized years     1 year 8 months 12 days    
Fair value of options vesting     $ 185,000 $ 193,000 $ 189,000
Projected share based compensation expense, 2019     139,000    
Projected share based compensation expense, 2020     76,000    
Projected share based compensation expense, 2021     11,000    
Aggregate intrinsic value of stock options outstanding     $ 553,000    
Weighted average fair value of options granted (in dollars per share) | $ / shares     $ 1.83 $ 4.57 $ 4.29
Restricted Stock          
Defined Benefit Plan Disclosure [Line Items]          
Share based payment award vesting period in years     3 years    
Outstanding Stock Awards          
Defined Benefit Plan Disclosure [Line Items]          
Share based payment award compensation expense     $ 5,400,000 $ 6,700,000 $ 6,000,000.0
Outstanding Stock Awards | Share-based Compensation Award, Tranche Two          
Defined Benefit Plan Disclosure [Line Items]          
Share based payment award vesting period in years     3 years    
Stock Options          
Defined Benefit Plan Disclosure [Line Items]          
Share based payment award vesting period in years     5 years    
Share based payment award compensation expense     $ 190,000 181,000 190,000
Share based payment award expiration period in years     10 years    
Performance Shares          
Defined Benefit Plan Disclosure [Line Items]          
Share based payment award vesting period in years     3 years    
Board of Directors          
Defined Benefit Plan Disclosure [Line Items]          
Benefit plans compensation expense     $ 10,000 15,000 10,000
Other Liabilities          
Defined Benefit Plan Disclosure [Line Items]          
Retirement plan liabilities     1,800,000 1,900,000  
Other Liabilities | Board of Directors          
Defined Benefit Plan Disclosure [Line Items]          
Retirement plan liabilities     127,000 130,000  
Supplemental Executive Retirement Plan          
Defined Benefit Plan Disclosure [Line Items]          
Aggregate contributions to the benefit plan     80,000 85,000 82,000
Decrease (increase) in other comprehensive income from retirement plans     $ (89,000) $ 187,000 $ 119,000
401(k) Plan          
Defined Benefit Plan Disclosure [Line Items]          
Percentage of matching contribution     25.00% 25.00% 25.00%
Percentage of contribution made by the participants in benefit plans     6.00% 6.00% 6.00%
Contribution to the Plan     $ 1,000,000.0 $ 981,000 $ 973,000
Estimated expense of supplemental ESOP provision     25,000 22,000 18,000
Pension          
Defined Benefit Plan Disclosure [Line Items]          
Defined benefit plan, funded (unfunded) status of plan     $ 19,447,000 $ 16,874,000 $ 14,571,000
Discount rate     2.30% 3.10% 4.25%
Contribution to the Plan     $ 0 $ 0 $ 0
Post-retirement          
Defined Benefit Plan Disclosure [Line Items]          
Defined benefit plan, funded (unfunded) status of plan     $ (18,805,000) $ (23,323,000) $ (20,028,000)
Discount rate     2.30% 3.10% 4.25%
Contribution to the Plan     $ 627,000 $ 600,000 $ 590,000